sar.sysstat(1)



SAR(1)                        Linux User's Manual                       SAR(1)

NAME
       sar - Collect, report, or save system activity information.

SYNOPSIS
       sar [ -A ] [ -B ] [ -b ] [ -C ] [ -D ] [ -d ] [ -F [ MOUNT ] ] [ -H ] [
       -h ] [ -p ] [ -q ] [ -r [ ALL ] ] [ -S ] [ -t ] [ -u [ ALL ] ] [ -V ] [
       -v  ]  [  -W  ]  [  -w ] [ -y ] [ -z ] [ --dec={ 0 | 1 | 2 } ] [ --dev=
       dev_list ] [ --fs= fs_list  ]  [  --help  ]  [  --human  ]  [  --iface=
       iface_list ] [ --sadc ] [ -I { int_list | SUM | ALL } ] [ -P { cpu_list
       | ALL } ] [ -m { keyword [,...] | ALL } ] [ -n { keyword [,...] | ALL }
       ]  [  -j  { ID | LABEL | PATH | UUID | ... } ] [ -f [ filename ] | -o [
       filename ] | -[0-9]+ ] [ -i interval ] [ -s [ hh:mm[:ss] ]  ]  [  -e  [
       hh:mm[:ss] ] ] [ interval [ count ] ]

DESCRIPTION
       The  sar  command  writes  to  standard output the contents of selected
       cumulative activity counters in the operating  system.  The  accounting
       system,  based  on  the  values  in  the count and interval parameters,
       writes information the specified number of times spaced at  the  speci-
       fied  intervals  in seconds.  If the interval parameter is set to zero,
       the sar command displays the average statistics for the time since  the
       system  was started. If the interval parameter is specified without the
       count parameter, then reports are  generated  continuously.   The  col-
       lected  data can also be saved in the file specified by the -o filename
       flag, in addition to being displayed onto the screen.  If  filename  is
       omitted,  sar  uses  the  standard system activity daily data file (see
       below).  By default all the data available from the kernel are saved in
       the data file.

       The  sar  command extracts and writes to standard output records previ-
       ously saved in a file. This file can be either the one specified by the
       -f  flag  or, by default, the standard system activity daily data file.
       It is also possible to enter -1, -2 etc. as an argument to sar to  dis-
       play  data of that days ago. For example, -1 will point at the standard
       system activity file of yesterday.

       Standard system activity daily data files are named saDD or saYYYYMMDD,
       where YYYY stands for the current year, MM for the current month and DD
       for the current day. They are the default files used by sar  only  when
       no  filename has been explicitly specified.  When used to write data to
       files (with its option -o), sar will use saYYYYMMDD if  option  -D  has
       also  been  specified, else it will use saDD.  When used to display the
       records previously saved in a file, sar will look for the  most  recent
       of saDD and saYYYYMMDD, and use it.

       Standard   system   activity  daily  data  files  are  located  in  the
       /var/log/sysstat directory by default. Yet it is possible to specify an
       alternate  location  for them: If a directory (instead of a plain file)
       is used with options -f or -o then it will be considered as the  direc-
       tory containing the data files.

       Without  the -P flag, the sar command reports system-wide (global among
       all processors) statistics, which are calculated as averages for values
       expressed  as  percentages,  and  as  sums otherwise. If the -P flag is
       given, the sar command reports activity which relates to the  specified
       processor  or  processors.  If -P ALL is given, the sar command reports
       statistics for each individual processor and  global  statistics  among
       all processors. Offline processors are not displayed.

       You  can  select  information  about  specific  system activities using
       flags. Not specifying any flags selects only CPU activity.   Specifying
       the -A flag selects all possible activities.

       The  default  version of the sar command (CPU utilization report) might
       be one of the first facilities the user runs to begin  system  activity
       investigation,  because it monitors major system resources. If CPU uti-
       lization is near 100 percent (user + nice + system), the workload  sam-
       pled is CPU-bound.

       If  multiple samples and multiple reports are desired, it is convenient
       to specify an output file for the sar command.  Run the sar command  as
       a background process. The syntax for this is:

       sar -o datafile interval count >/dev/null 2>&1 &

       All  data  are  captured in binary form and saved to a file (datafile).
       The data can then be selectively displayed with the sar  command  using
       the  -f  option.  Set the interval and count parameters to select count
       records at interval second intervals. If the  count  parameter  is  not
       set, all the records saved in the file will be selected.  Collection of
       data in this manner is useful  to  characterize  system  usage  over  a
       period of time and determine peak usage hours.

       Note:     The sar command only reports on local activities.

OPTIONS
       -A     This  is equivalent to specifying -bBdFHqSuvwWy -I SUM -I ALL -m
              ALL -n ALL -r ALL -u ALL -P ALL.

       -B     Report paging statistics.  The following values are displayed:

              pgpgin/s
                     Total number of kilobytes the system paged in  from  disk
                     per second.

              pgpgout/s
                     Total  number  of  kilobytes the system paged out to disk
                     per second.

              fault/s
                     Number of page faults (major + minor) made by the  system
                     per second.  This is not a count of page faults that gen-
                     erate I/O, because some page faults can be resolved with-
                     out I/O.

              majflt/s
                     Number  of  major  faults the system has made per second,
                     those which have required  loading  a  memory  page  from
                     disk.

              pgfree/s
                     Number of pages placed on the free list by the system per
                     second.

              pgscank/s
                     Number of pages scanned by the kswapd daemon per second.

              pgscand/s
                     Number of pages scanned directly per second.

              pgsteal/s
                     Number of pages  the  system  has  reclaimed  from  cache
                     (pagecache  and swapcache) per second to satisfy its mem-
                     ory demands.

              %vmeff
                     Calculated as pgsteal / pgscan, this is a metric  of  the
                     efficiency  of  page  reclaim.  If  it  is near 100% then
                     almost every page coming off the  tail  of  the  inactive
                     list  is being reaped. If it gets too low (e.g. less than
                     30%) then the virtual memory is having  some  difficulty.
                     This  field  is  displayed  as zero if no pages have been
                     scanned during the interval of time.

       -b     Report I/O and transfer rate statistics.  The  following  values
              are displayed:

              tps
                     Total  number of transfers per second that were issued to
                     physical devices.  A transfer is  an  I/O  request  to  a
                     physical  device.  Multiple  logical requests can be com-
                     bined into a single I/O request to the device.  A  trans-
                     fer is of indeterminate size.

              rtps
                     Total number of read requests per second issued to physi-
                     cal devices.

              wtps
                     Total number of write requests per second issued to phys-
                     ical devices.

              bread/s
                     Total  amount of data read from the devices in blocks per
                     second.  Blocks are equivalent to sectors  and  therefore
                     have a size of 512 bytes.

              bwrtn/s
                     Total  amount  of  data  written to devices in blocks per
                     second.

       -C     When reading data from a file, tell sar to display comments that
              have been inserted by sadc.

       -D     Use  saYYYYMMDD  instead of saDD as the standard system activity
              daily data file name. This option works only when used  in  con-
              junction with option -o to save data to file.

       -d     Report activity for each block device.  When data are displayed,
              the device specification devM-n is generally used (DEV  column).
              M  is  the  major  number  of the device and n its minor number.
              Device names may also be pretty-printed if option -p is used  or
              persistent device names can be printed if option -j is used (see
              below). Statistics  for  all  devices  are  displayed  unless  a
              restricted  list  is  specified  using option --dev= (see corre-
              sponding option entry).  Note that disk activity depends on sadc
              options -S DISK and -S XDISK to be collected. The following val-
              ues are displayed:

              tps
                     Total number of transfers per second that were issued  to
                     physical  devices.   A  transfer  is  an I/O request to a
                     physical device. Multiple logical requests  can  be  com-
                     bined  into a single I/O request to the device.  A trans-
                     fer is of indeterminate size.

              rkB/s
                     Number of kilobytes read from the device per second.

              wkB/s
                     Number of kilobytes written to the device per second.

              areq-sz
                     The average size (in kilobytes) of the I/O requests  that
                     were issued to the device.
                     Note:  In  previous  versions,  this  field  was known as
                     avgrq-sz and was expressed in sectors.

              aqu-sz
                     The average queue length of the requests that were issued
                     to the device.
                     Note:  In  previous  versions,  this  field  was known as
                     avgqu-sz.

              await
                     The average  time  (in  milliseconds)  for  I/O  requests
                     issued to the device to be served. This includes the time
                     spent by the requests in queue and the time spent servic-
                     ing them.

              svctm
                     The  average  service  time  (in  milliseconds)  for  I/O
                     requests that were issued to the device. Warning! Do  not
                     trust  this field any more. This field will be removed in
                     a future sysstat version.

              %util
                     Percentage of elapsed time during which I/O requests were
                     issued  to  the  device  (bandwidth  utilization  for the
                     device). Device saturation  occurs  when  this  value  is
                     close  to 100% for devices serving requests serially. But
                     for devices serving requests in parallel,  such  as  RAID
                     arrays  and  modern  SSDs,  this  number does not reflect
                     their performance limits.

       --dec={ 0 | 1 | 2 }
              Specify the number of decimal places to use  (0  to  2,  default
              value is 2).

       --dev=dev_list
              Specify  the  block  devices for which statistics are to be dis-
              played by sar.  dev_list is a  list  of  comma-separated  device
              names.

       -e [ hh:mm[:ss] ]
              Set  the  ending  time of the report. The default ending time is
              18:00:00. Hours must be given in 24-hour  format.   This  option
              can  be  used  when  data  are  read  from  or written to a file
              (options -f or -o).

       -F [ MOUNT ]
              Display   statistics   for   currently   mounted    filesystems.
              Pseudo-filesystems  are  ignored.  At the end of the report, sar
              will display a summary of all those  filesystems.   Use  of  the
              MOUNT  parameter  keyword  indicates  that  mountpoint  will  be
              reported  instead  of  filesystem  device.  Statistics  for  all
              filesystems  are displayed unless a restricted list is specified
              using option --fs= (see corresponding option entry).  Note  that
              filesystems statistics depend on sadc option -S XDISK to be col-
              lected.

              The following values are displayed:

              MBfsfree
                     Total amount a free space in megabytes  (including  space
                     available only to privileged user).

              MBfsused
                     Total amount of space used in megabytes.

              %fsused
                     Percentage  of filesystem space used, as seen by a privi-
                     leged user.

              %ufsused
                     Percentage of  filesystem  space  used,  as  seen  by  an
                     unprivileged user.

              Ifree
                     Total number of free file nodes in filesystem.

              Iused
                     Total number of file nodes used in filesystem.

              %Iused
                     Percentage of file nodes used in filesystem.

       -f [ filename ]
              Extract records from filename (created by the -o filename flag).
              The default value of the filename parameter is the current stan-
              dard  system  activity daily data file.  If filename is a direc-
              tory instead of a plain file then it is considered as the direc-
              tory  where  the  standard  system activity daily data files are
              located. The -f option is exclusive of the -o option.

       --fs=fs_list
              Specify the filesystems for which statistics are to be displayed
              by  sar.   fs_list is a list of comma-separated filesystem names
              or mountpoints.

       -H     Report hugepages utilization statistics.  The  following  values
              are displayed:

              kbhugfree
                     Amount  of  hugepages memory in kilobytes that is not yet
                     allocated.

              kbhugused
                     Amount of hugepages memory in  kilobytes  that  has  been
                     allocated.

              %hugused
                     Percentage  of total hugepages memory that has been allo-
                     cated.

       -h     Make the output of sar  easier  to  read  by  a  human.  Options
              --human  and  -p (pretty-print) are enabled implicitly with this
              option.  This option may be especially  useful  when  displaying
              e.g., network interfaces or block devices statistics.

       --help Display a short help message then exit.

       --human
              Print  sizes  in  human  readable format (e.g. 1.0k, 1.2M, etc.)
              The units displayed with this option supersede any other default
              units (e.g.  kilobytes, sectors...) associated with the metrics.

       -I { int_list | SUM | ALL }
              Report  statistics  for  interrupts.   int_list  is  a  list  of
              comma-separated values or range of values (e.g.,  0-16,35,400-).
              The  SUM  keyword  indicates that the total number of interrupts
              received per second is to be displayed. The  ALL  keyword  indi-
              cates  that  statistics from all interrupts, including potential
              APIC interrupt sources, are to be reported.  Note that interrupt
              statistics depend on sadc option "-S INT" to be collected.

       -i interval
              Select  data records at seconds as close as possible to the num-
              ber specified by the interval parameter.

       --iface=iface_list
              Specify the network interfaces for which statistics  are  to  be
              displayed  by  sar.   iface_list  is  a  list of comma-separated
              interface names.

       -j { ID | LABEL | PATH | UUID | ... }
              Display persistent device names. Use this option in  conjunction
              with option -d.  Options ID, LABEL, etc. specify the type of the
              persistent name. These options are not limited,  only  prerequi-
              site is that directory with required persistent names is present
              in /dev/disk.  If persistent name is not found for  the  device,
              the device name is pretty-printed (see option -p below).

       -m { keyword [,...] | ALL }
              Report  power management statistics.  Note that these statistics
              depend on sadc's option "-S POWER" to be collected.

              Possible keywords are CPU, FAN, FREQ, IN, TEMP and USB.

              With the CPU keyword, statistics about CPU  are  reported.   The
              following value is displayed:

              MHz
                     Instantaneous CPU clock frequency in MHz.

              With  the FAN keyword, statistics about fans speed are reported.
              The following values are displayed:

              rpm
                     Fan speed expressed in revolutions per minute.

              drpm
                     This field is calculated as the difference  between  cur-
                     rent fan speed (rpm) and its low limit (fan_min).

              DEVICE
                     Sensor device name.

              With  the FREQ keyword, statistics about CPU clock frequency are
              reported.  The following value is displayed:

              wghMHz
                     Weighted average CPU clock frequency in MHz.   Note  that
                     the  cpufreq-stats  driver must be compiled in the kernel
                     for this option to work.

              With  the  IN  keyword,  statistics  about  voltage  inputs  are
              reported.  The following values are displayed:

              inV
                     Voltage input expressed in Volts.

              %in
                     Relative  input value. A value of 100% means that voltage
                     input has reached its high limit (in_max) whereas a value
                     of 0% means that it has reached its low limit (in_min).

              DEVICE
                     Sensor device name.

              With  the TEMP keyword, statistics about devices temperature are
              reported.  The following values are displayed:

              degC
                     Device temperature expressed in degrees Celsius.

              %temp
                     Relative device temperature. A value of 100%  means  that
                     temperature has reached its high limit (temp_max).

              DEVICE
                     Sensor device name.

              With  the  USB  keyword, the sar command takes a snapshot of all
              the USB devices currently plugged into the system. At the end of
              the report, sar will display a summary of all those USB devices.
              The following values are displayed:

              BUS
                     Root hub number of the USB device.

              idvendor
                     Vendor ID number (assigned by USB organization).

              idprod
                     Product ID number (assigned by Manufacturer).

              maxpower
                     Maximum power consumption of  the  device  (expressed  in
                     mA).

              manufact
                     Manufacturer name.

              product
                     Product name.

              The  ALL  keyword  is  equivalent to specifying all the keywords
              above and therefore all  the  power  management  statistics  are
              reported.

       -n { keyword [,...] | ALL }
              Report network statistics.

              Possible keywords are DEV, EDEV, FC, ICMP, EICMP, ICMP6, EICMP6,
              IP, EIP, IP6, EIP6, NFS, NFSD, SOCK, SOCK6, SOFT, TCP, ETCP, UDP
              and UDP6.

              With  the  DEV  keyword, statistics from the network devices are
              reported.  Statistics for all network interfaces  are  displayed
              unless a restricted list is specified using option --iface= (see
              corresponding option entry).   The  following  values  are  dis-
              played:

              IFACE
                     Name  of  the  network interface for which statistics are
                     reported.

              rxpck/s
                     Total number of packets received per second.

              txpck/s
                     Total number of packets transmitted per second.

              rxkB/s
                     Total number of kilobytes received per second.

              txkB/s
                     Total number of kilobytes transmitted per second.

              rxcmp/s
                     Number of compressed packets  received  per  second  (for
                     cslip etc.).

              txcmp/s
                     Number of compressed packets transmitted per second.

              rxmcst/s
                     Number of multicast packets received per second.

              %ifutil
                     Utilization  percentage  of  the  network  interface. For
                     half-duplex interfaces, utilization is  calculated  using
                     the  sum  of  rxkB/s  and  txkB/s  as a percentage of the
                     interface speed. For full-duplex, this is the greater  of
                     rxkB/S or txkB/s.

              With  the EDEV keyword, statistics on failures (errors) from the
              network devices are reported.  Statistics for all network inter-
              faces  are displayed unless a restricted list is specified using
              option --iface= (see corresponding option entry).  The following
              values are displayed:

              IFACE
                     Name  of  the  network interface for which statistics are
                     reported.

              rxerr/s
                     Total number of bad packets received per second.

              txerr/s
                     Total number of errors that  happened  per  second  while
                     transmitting packets.

              coll/s
                     Number  of  collisions  that  happened  per  second while
                     transmitting packets.

              rxdrop/s
                     Number of received packets dropped per second because  of
                     a lack of space in linux buffers.

              txdrop/s
                     Number  of transmitted packets dropped per second because
                     of a lack of space in linux buffers.

              txcarr/s
                     Number of carrier-errors that happened per  second  while
                     transmitting packets.

              rxfram/s
                     Number of frame alignment errors that happened per second
                     on received packets.

              rxfifo/s
                     Number of FIFO overrun errors that happened per second on
                     received packets.

              txfifo/s
                     Number of FIFO overrun errors that happened per second on
                     transmitted packets.

              With the FC keyword, statistics about fibre channel traffic  are
              reported.   Note  that fibre channel statistics depend on sadc's
              option "-S DISK" to be collected.  The following values are dis-
              played:

              FCHOST
                     Name  of  the fibre channel host bus adapter (HBA) inter-
                     face for which statistics are reported.

              fch_rxf/s
                     The total number of frames received per second.

              fch_txf/s
                     The total number of frames transmitted per second.

              fch_rxw/s
                     The total number of transmission words received per  sec-
                     ond.

              fch_txw/s
                     The  total  number  of transmission words transmitted per
                     second.

              With the ICMP keyword, statistics about ICMPv4  network  traffic
              are  reported.   Note  that  ICMPv4  statistics depend on sadc's
              option "-S SNMP" to be collected.  The following values are dis-
              played (formal SNMP names between square brackets):

              imsg/s
                     The  total  number  of  ICMP  messages  which  the entity
                     received per second [icmpInMsgs].  Note that this counter
                     includes all those counted by ierr/s.

              omsg/s
                     The  total  number  of  ICMP  messages  which this entity
                     attempted to send per second  [icmpOutMsgs].   Note  that
                     this counter includes all those counted by oerr/s.

              iech/s
                     The  number  of ICMP Echo (request) messages received per
                     second [icmpInEchos].

              iechr/s
                     The number of ICMP Echo Reply messages received per  sec-
                     ond [icmpInEchoReps].

              oech/s
                     The  number of ICMP Echo (request) messages sent per sec-
                     ond [icmpOutEchos].

              oechr/s
                     The number of ICMP Echo Reply messages  sent  per  second
                     [icmpOutEchoReps].

              itm/s
                     The  number of ICMP Timestamp (request) messages received
                     per second [icmpInTimestamps].

              itmr/s
                     The number of ICMP Timestamp Reply messages received  per
                     second [icmpInTimestampReps].

              otm/s
                     The  number of ICMP Timestamp (request) messages sent per
                     second [icmpOutTimestamps].

              otmr/s
                     The number of ICMP Timestamp Reply messages sent per sec-
                     ond [icmpOutTimestampReps].

              iadrmk/s
                     The number of ICMP Address Mask Request messages received
                     per second [icmpInAddrMasks].

              iadrmkr/s
                     The number of ICMP Address Mask Reply  messages  received
                     per second [icmpInAddrMaskReps].

              oadrmk/s
                     The number of ICMP Address Mask Request messages sent per
                     second [icmpOutAddrMasks].

              oadrmkr/s
                     The number of ICMP Address Mask Reply messages  sent  per
                     second [icmpOutAddrMaskReps].

              With  the  EICMP keyword, statistics about ICMPv4 error messages
              are reported.  Note that  ICMPv4  statistics  depend  on  sadc's
              option "-S SNMP" to be collected.  The following values are dis-
              played (formal SNMP names between square brackets):

              ierr/s
                     The number of ICMP messages per second which  the  entity
                     received  but  determined  as having ICMP-specific errors
                     (bad ICMP checksums, bad length, etc.) [icmpInErrors].

              oerr/s
                     The number of ICMP messages per second which this  entity
                     did  not send due to problems discovered within ICMP such
                     as a lack of buffers [icmpOutErrors].

              idstunr/s
                     The  number  of  ICMP  Destination  Unreachable  messages
                     received per second [icmpInDestUnreachs].

              odstunr/s
                     The  number of ICMP Destination Unreachable messages sent
                     per second [icmpOutDestUnreachs].

              itmex/s
                     The number of ICMP Time Exceeded  messages  received  per
                     second [icmpInTimeExcds].

              otmex/s
                     The number of ICMP Time Exceeded messages sent per second
                     [icmpOutTimeExcds].

              iparmpb/s
                     The number of ICMP Parameter  Problem  messages  received
                     per second [icmpInParmProbs].

              oparmpb/s
                     The  number  of  ICMP Parameter Problem messages sent per
                     second [icmpOutParmProbs].

              isrcq/s
                     The number of ICMP Source Quench  messages  received  per
                     second [icmpInSrcQuenchs].

              osrcq/s
                     The number of ICMP Source Quench messages sent per second
                     [icmpOutSrcQuenchs].

              iredir/s
                     The number of ICMP Redirect messages received per  second
                     [icmpInRedirects].

              oredir/s
                     The  number  of  ICMP  Redirect  messages sent per second
                     [icmpOutRedirects].

              With the ICMP6 keyword, statistics about ICMPv6 network  traffic
              are  reported.   Note  that  ICMPv6  statistics depend on sadc's
              option "-S IPV6" to be collected.  The following values are dis-
              played (formal SNMP names between square brackets):

              imsg6/s
                     The  total number of ICMP messages received by the inter-
                     face per second  which  includes  all  those  counted  by
                     ierr6/s [ipv6IfIcmpInMsgs].

              omsg6/s
                     The  total  number  of ICMP messages which this interface
                     attempted to send per second [ipv6IfIcmpOutMsgs].

              iech6/s
                     The number of ICMP Echo (request)  messages  received  by
                     the interface per second [ipv6IfIcmpInEchos].

              iechr6/s
                     The  number  of  ICMP Echo Reply messages received by the
                     interface per second [ipv6IfIcmpInEchoReplies].

              oechr6/s
                     The number of ICMP Echo Reply messages sent by the inter-
                     face per second [ipv6IfIcmpOutEchoReplies].

              igmbq6/s
                     The  number  of  ICMPv6  Group  Membership Query messages
                     received by the interface per second  [ipv6IfIcmpInGroup-
                     MembQueries].

              igmbr6/s
                     The  number  of ICMPv6 Group Membership Response messages
                     received by the interface per second  [ipv6IfIcmpInGroup-
                     MembResponses].

              ogmbr6/s
                     The  number  of ICMPv6 Group Membership Response messages
                     sent per second [ipv6IfIcmpOutGroupMembResponses].

              igmbrd6/s
                     The number of ICMPv6 Group Membership Reduction  messages
                     received  by the interface per second [ipv6IfIcmpInGroup-
                     MembReductions].

              ogmbrd6/s
                     The number of ICMPv6 Group Membership Reduction  messages
                     sent per second [ipv6IfIcmpOutGroupMembReductions].

              irtsol6/s
                     The  number  of  ICMP Router Solicit messages received by
                     the interface per second [ipv6IfIcmpInRouterSolicits].

              ortsol6/s
                     The number of ICMP Router Solicitation messages  sent  by
                     the interface per second [ipv6IfIcmpOutRouterSolicits].

              irtad6/s
                     The number of ICMP Router Advertisement messages received
                     by the interface per second [ipv6IfIcmpInRouterAdvertise-
                     ments].

              inbsol6/s
                     The  number of ICMP Neighbor Solicit messages received by
                     the interface per second [ipv6IfIcmpInNeighborSolicits].

              onbsol6/s
                     The number of ICMP Neighbor Solicitation messages sent by
                     the interface per second [ipv6IfIcmpOutNeighborSolicits].

              inbad6/s
                     The   number  of  ICMP  Neighbor  Advertisement  messages
                     received by the interface per second [ipv6IfIcmpInNeighb-
                     orAdvertisements].

              onbad6/s
                     The  number  of ICMP Neighbor Advertisement messages sent
                     by the interface per second  [ipv6IfIcmpOutNeighborAdver-
                     tisements].

              With  the EICMP6 keyword, statistics about ICMPv6 error messages
              are reported.  Note that  ICMPv6  statistics  depend  on  sadc's
              option "-S IPV6" to be collected.  The following values are dis-
              played (formal SNMP names between square brackets):

              ierr6/s
                     The number of ICMP messages per second which  the  inter-
                     face  received  but  determined  as  having ICMP-specific
                     errors   (bad   ICMP   checksums,   bad   length,   etc.)
                     [ipv6IfIcmpInErrors]

              idtunr6/s
                     The  number  of  ICMP  Destination  Unreachable  messages
                     received by the interface per second [ipv6IfIcmpInDestUn-
                     reachs].

              odtunr6/s
                     The  number of ICMP Destination Unreachable messages sent
                     by the interface per second [ipv6IfIcmpOutDestUnreachs].

              itmex6/s
                     The number of ICMP Time Exceeded messages received by the
                     interface per second [ipv6IfIcmpInTimeExcds].

              otmex6/s
                     The  number  of  ICMP  Time Exceeded messages sent by the
                     interface per second [ipv6IfIcmpOutTimeExcds].

              iprmpb6/s
                     The number of ICMP Parameter Problem messages received by
                     the interface per second [ipv6IfIcmpInParmProblems].

              oprmpb6/s
                     The number of ICMP Parameter Problem messages sent by the
                     interface per second [ipv6IfIcmpOutParmProblems].

              iredir6/s
                     The number of Redirect messages received by the interface
                     per second [ipv6IfIcmpInRedirects].

              oredir6/s
                     The  number of Redirect messages sent by the interface by
                     second [ipv6IfIcmpOutRedirects].

              ipck2b6/s
                     The number of ICMP Packet Too Big  messages  received  by
                     the interface per second [ipv6IfIcmpInPktTooBigs].

              opck2b6/s
                     The  number  of  ICMP Packet Too Big messages sent by the
                     interface per second [ipv6IfIcmpOutPktTooBigs].

              With the IP keyword, statistics about IPv4 network  traffic  are
              reported.  Note that IPv4 statistics depend on sadc's option "-S
              SNMP" to be collected.  The following values are displayed (for-
              mal SNMP names between square brackets):

              irec/s
                     The  total number of input datagrams received from inter-
                     faces per  second,  including  those  received  in  error
                     [ipInReceives].

              fwddgm/s
                     The  number of input datagrams per second, for which this
                     entity was not their final IP destination, as a result of
                     which an attempt was made to find a route to forward them
                     to that final destination [ipForwDatagrams].

              idel/s
                     The total number of input datagrams  successfully  deliv-
                     ered  per  second  to  IP user-protocols (including ICMP)
                     [ipInDelivers].

              orq/s
                     The total number of IP datagrams which local IP user-pro-
                     tocols  (including  ICMP)  supplied  per  second to IP in
                     requests for  transmission  [ipOutRequests].   Note  that
                     this  counter  does  not include any datagrams counted in
                     fwddgm/s.

              asmrq/s
                     The number of IP  fragments  received  per  second  which
                     needed to be reassembled at this entity [ipReasmReqds].

              asmok/s
                     The  number of IP datagrams successfully re-assembled per
                     second [ipReasmOKs].

              fragok/s
                     The number of IP datagrams that  have  been  successfully
                     fragmented at this entity per second [ipFragOKs].

              fragcrt/s
                     The number of IP datagram fragments that have been gener-
                     ated per second as a  result  of  fragmentation  at  this
                     entity [ipFragCreates].

              With  the  EIP keyword, statistics about IPv4 network errors are
              reported.  Note that IPv4 statistics depend on sadc's option "-S
              SNMP" to be collected.  The following values are displayed (for-
              mal SNMP names between square brackets):

              ihdrerr/s
                     The number of input datagrams discarded per second due to
                     errors in their IP headers, including bad checksums, ver-
                     sion number mismatch, other format  errors,  time-to-live
                     exceeded,   errors  discovered  in  processing  their  IP
                     options, etc. [ipInHdrErrors]

              iadrerr/s
                     The  number  of  input  datagrams  discarded  per  second
                     because  the  IP address in their IP header's destination
                     field was not a valid address  to  be  received  at  this
                     entity.  This  count  includes  invalid  addresses (e.g.,
                     0.0.0.0) and  addresses  of  unsupported  Classes  (e.g.,
                     Class  E).  For  entities  which  are  not IP routers and
                     therefore do not forward datagrams, this counter includes
                     datagrams  discarded  because the destination address was
                     not a local address [ipInAddrErrors].

              iukwnpr/s
                     The number of locally-addressed datagrams  received  suc-
                     cessfully  but discarded per second because of an unknown
                     or unsupported protocol [ipInUnknownProtos].

              idisc/s
                     The number of input IP datagrams per second for which  no
                     problems were encountered to prevent their continued pro-
                     cessing, but which were discarded (e.g., for lack of buf-
                     fer  space)  [ipInDiscards].  Note that this counter does
                     not  include  any  datagrams  discarded  while   awaiting
                     re-assembly.

              odisc/s
                     The number of output IP datagrams per second for which no
                     problem was encountered to prevent their transmission  to
                     their  destination,  but  which were discarded (e.g., for
                     lack of buffer space) [ipOutDiscards].   Note  that  this
                     counter  would  include  datagrams counted in fwddgm/s if
                     any such packets met this (discretionary) discard  crite-
                     rion.

              onort/s
                     The  number  of IP datagrams discarded per second because
                     no route could be found to transmit them to their  desti-
                     nation  [ipOutNoRoutes].  Note that this counter includes
                     any  packets  counted  in  fwddgm/s   which   meet   this
                     'no-route'  criterion.  Note that this includes any data-
                     grams which a  host  cannot  route  because  all  of  its
                     default routers are down.

              asmf/s
                     The  number  of  failures  detected  per second by the IP
                     re-assembly algorithm (for whatever  reason:  timed  out,
                     errors,  etc) [ipReasmFails].  Note that this is not nec-
                     essarily a count of discarded  IP  fragments  since  some
                     algorithms  can  lose track of the number of fragments by
                     combining them as they are received.

              fragf/s
                     The number of IP datagrams that have been  discarded  per
                     second  because  they  needed  to  be  fragmented at this
                     entity but could not be, e.g., because their Don't  Frag-
                     ment flag was set [ipFragFails].

              With  the IP6 keyword, statistics about IPv6 network traffic are
              reported.  Note that IPv6 statistics depend on sadc's option "-S
              IPV6" to be collected.  The following values are displayed (for-
              mal SNMP names between square brackets):

              irec6/s
                     The total number of input datagrams received from  inter-
                     faces  per  second,  including  those  received  in error
                     [ipv6IfStatsInReceives].

              fwddgm6/s
                     The number of output  datagrams  per  second  which  this
                     entity received and forwarded to their final destinations
                     [ipv6IfStatsOutForwDatagrams].

              idel6/s
                     The total number of datagrams successfully delivered  per
                     second  to IPv6 user-protocols (including ICMP) [ipv6IfS-
                     tatsInDelivers].

              orq6/s
                     The total number  of  IPv6  datagrams  which  local  IPv6
                     user-protocols  (including  ICMP)  supplied per second to
                     IPv6  in  requests  for  transmission  [ipv6IfStatsOutRe-
                     quests].   Note  that  this  counter does not include any
                     datagrams counted in fwddgm6/s.

              asmrq6/s
                     The number of IPv6 fragments received  per  second  which
                     needed  to  be reassembled at this interface [ipv6IfStat-
                     sReasmReqds].

              asmok6/s
                     The number of IPv6 datagrams successfully reassembled per
                     second [ipv6IfStatsReasmOKs].

              imcpck6/s
                     The  number  of  multicast packets received per second by
                     the interface [ipv6IfStatsInMcastPkts].

              omcpck6/s
                     The number of multicast packets transmitted per second by
                     the interface [ipv6IfStatsOutMcastPkts].

              fragok6/s
                     The  number of IPv6 datagrams that have been successfully
                     fragmented at this output interface per second  [ipv6IfS-
                     tatsOutFragOKs].

              fragcr6/s
                     The  number  of  output datagram fragments that have been
                     generated per second as a result of fragmentation at this
                     output interface [ipv6IfStatsOutFragCreates].

              With  the EIP6 keyword, statistics about IPv6 network errors are
              reported.  Note that IPv6 statistics depend on sadc's option "-S
              IPV6" to be collected.  The following values are displayed (for-
              mal SNMP names between square brackets):

              ihdrer6/s
                     The number of input datagrams discarded per second due to
                     errors  in  their  IPv6 headers, including version number
                     mismatch, other format errors, hop count exceeded, errors
                     discovered   in   processing  their  IPv6  options,  etc.
                     [ipv6IfStatsInHdrErrors]

              iadrer6/s
                     The  number  of  input  datagrams  discarded  per  second
                     because  the IPv6 address in their IPv6 header's destina-
                     tion field was not a valid address to be received at this
                     entity. This count includes invalid addresses (e.g., ::0)
                     and unsupported addresses (e.g., addresses  with  unallo-
                     cated  prefixes). For entities which are not IPv6 routers
                     and therefore do  not  forward  datagrams,  this  counter
                     includes  datagrams  discarded  because  the  destination
                     address  was  not  a  local  address  [ipv6IfStatsInAddr-
                     Errors].

              iukwnp6/s
                     The  number  of locally-addressed datagrams received suc-
                     cessfully but discarded per second because of an  unknown
                     or unsupported protocol [ipv6IfStatsInUnknownProtos].

              i2big6/s
                     The number of input datagrams that could not be forwarded
                     per second because their size exceeded the  link  MTU  of
                     outgoing interface [ipv6IfStatsInTooBigErrors].

              idisc6/s
                     The  number  of input IPv6 datagrams per second for which
                     no problems were encountered to prevent  their  continued
                     processing,  but  which were discarded (e.g., for lack of
                     buffer space)  [ipv6IfStatsInDiscards].  Note  that  this
                     counter  does  not  include any datagrams discarded while
                     awaiting re-assembly.

              odisc6/s
                     The number of output IPv6 datagrams per second for  which
                     no  problem was encountered to prevent their transmission
                     to their destination, but which were discarded (e.g., for
                     lack of buffer space) [ipv6IfStatsOutDiscards]. Note that
                     this counter would include datagrams counted in fwddgm6/s
                     if any such packets met this (discretionary) discard cri-
                     terion.

              inort6/s
                     The  number  of  input  datagrams  discarded  per  second
                     because no route could be found to transmit them to their
                     destination [ipv6IfStatsInNoRoutes].

              onort6/s
                     The number of locally generated  IP  datagrams  discarded
                     per  second  because  no route could be found to transmit
                     them to their destination [unknown formal SNMP name].

              asmf6/s
                     The number of failures detected per second  by  the  IPv6
                     re-assembly  algorithm  (for  whatever reason: timed out,
                     errors, etc.) [ipv6IfStatsReasmFails].  Note that this is
                     not necessarily a count of discarded IPv6 fragments since
                     some algorithms can lose track of the number of fragments
                     by combining them as they are received.

              fragf6/s
                     The number of IPv6 datagrams that have been discarded per
                     second because they needed to be fragmented at this  out-
                     put interface but could not be [ipv6IfStatsOutFragFails].

              itrpck6/s
                     The  number  of  input  datagrams  discarded  per  second
                     because datagram frame didn't carry enough data [ipv6IfS-
                     tatsInTruncatedPkts].

              With  the  NFS keyword, statistics about NFS client activity are
              reported.  The following values are displayed:

              call/s
                     Number of RPC requests made per second.

              retrans/s
                     Number of RPC requests per second, those which needed  to
                     be  retransmitted  (for example because of a server time-
                     out).

              read/s
                     Number of 'read' RPC calls made per second.

              write/s
                     Number of 'write' RPC calls made per second.

              access/s
                     Number of 'access' RPC calls made per second.

              getatt/s
                     Number of 'getattr' RPC calls made per second.

              With the NFSD keyword, statistics about NFS server activity  are
              reported.  The following values are displayed:

              scall/s
                     Number of RPC requests received per second.

              badcall/s
                     Number  of  bad  RPC  requests received per second, those
                     whose processing generated an error.

              packet/s
                     Number of network packets received per second.

              udp/s
                     Number of UDP packets received per second.

              tcp/s
                     Number of TCP packets received per second.

              hit/s
                     Number of reply cache hits per second.

              miss/s
                     Number of reply cache misses per second.

              sread/s
                     Number of 'read' RPC calls received per second.

              swrite/s
                     Number of 'write' RPC calls received per second.

              saccess/s
                     Number of 'access' RPC calls received per second.

              sgetatt/s
                     Number of 'getattr' RPC calls received per second.

              With the SOCK keyword, statistics on sockets in use are reported
              (IPv4).  The following values are displayed:

              totsck
                     Total number of sockets used by the system.

              tcpsck
                     Number of TCP sockets currently in use.

              udpsck
                     Number of UDP sockets currently in use.

              rawsck
                     Number of RAW sockets currently in use.

              ip-frag
                     Number of IP fragments currently in queue.

              tcp-tw
                     Number of TCP sockets in TIME_WAIT state.

              With  the  SOCK6  keyword,  statistics  on  sockets  in  use are
              reported (IPv6).  Note that IPv6  statistics  depend  on  sadc's
              option "-S IPV6" to be collected.  The following values are dis-
              played:

              tcp6sck
                     Number of TCPv6 sockets currently in use.

              udp6sck
                     Number of UDPv6 sockets currently in use.

              raw6sck
                     Number of RAWv6 sockets currently in use.

              ip6-frag
                     Number of IPv6 fragments currently in use.

              With the SOFT keyword, statistics about  software-based  network
              processing are reported.  The following values are displayed:

              total/s
                     The total number of network frames processed per second.

              dropd/s
                     The  total  number  of  network frames dropped per second
                     because there was no room on the processing queue.

              squeezd/s
                     The number of times the softirq handler  function  termi-
                     nated  per  second because its budget was consumed or the
                     time limit was reached, but more  work  could  have  been
                     done.

              rx_rps/s
                     The  number of times the CPU has been woken up per second
                     to process packets via an inter-processor interrupt.

              flw_lim/s
                     The number of times the flow limit has been  reached  per
                     second.   Flow  limiting  is an optional RPS feature that
                     can be used to limit the number of packets queued to  the
                     backlog for each flow to a certain amount.  This can help
                     ensure that smaller flows are processed even though  much
                     larger flows are pushing packets in.

              With the TCP keyword, statistics about TCPv4 network traffic are
              reported.  Note that TCPv4 statistics depend  on  sadc's  option
              "-S  SNMP"  to be collected.  The following values are displayed
              (formal SNMP names between square brackets):

              active/s
                     The number of times TCP connections have  made  a  direct
                     transition  to  the  SYN-SENT state from the CLOSED state
                     per second [tcpActiveOpens].

              passive/s
                     The number of times TCP connections have  made  a  direct
                     transition  to  the  SYN-RCVD state from the LISTEN state
                     per second [tcpPassiveOpens].

              iseg/s
                     The total number of segments received per second, includ-
                     ing  those  received  in  error  [tcpInSegs].  This count
                     includes segments received on currently established  con-
                     nections.

              oseg/s
                     The  total  number of segments sent per second, including
                     those on current connections but excluding those contain-
                     ing only retransmitted octets [tcpOutSegs].

              With the ETCP keyword, statistics about TCPv4 network errors are
              reported.  Note that TCPv4 statistics depend  on  sadc's  option
              "-S  SNMP"  to be collected.  The following values are displayed
              (formal SNMP names between square brackets):

              atmptf/s
                     The number of times per second TCP connections have  made
                     a  direct  transition to the CLOSED state from either the
                     SYN-SENT state or the SYN-RCVD state, plus the number  of
                     times per second TCP connections have made a direct tran-
                     sition to  the  LISTEN  state  from  the  SYN-RCVD  state
                     [tcpAttemptFails].

              estres/s
                     The  number of times per second TCP connections have made
                     a direct transition to the CLOSED state from  either  the
                     ESTABLISHED  state  or  the CLOSE-WAIT state [tcpEstabRe-
                     sets].

              retrans/s
                     The total number of segments retransmitted per  second  -
                     that  is, the number of TCP segments transmitted contain-
                     ing one or more  previously  transmitted  octets  [tcpRe-
                     transSegs].

              isegerr/s
                     The total number of segments received in error (e.g., bad
                     TCP checksums) per second [tcpInErrs].

              orsts/s
                     The number of TCP segments sent per second containing the
                     RST flag [tcpOutRsts].

              With the UDP keyword, statistics about UDPv4 network traffic are
              reported.  Note that UDPv4 statistics depend  on  sadc's  option
              "-S  SNMP"  to be collected.  The following values are displayed
              (formal SNMP names between square brackets):

              idgm/s
                     The total number of UDP datagrams delivered per second to
                     UDP users [udpInDatagrams].

              odgm/s
                     The  total  number  of UDP datagrams sent per second from
                     this entity [udpOutDatagrams].

              noport/s
                     The total number of received UDP datagrams per second for
                     which  there  was  no application at the destination port
                     [udpNoPorts].

              idgmerr/s
                     The number of received  UDP  datagrams  per  second  that
                     could not be delivered for reasons other than the lack of
                     an application at the destination port [udpInErrors].

              With the UDP6 keyword, statistics about  UDPv6  network  traffic
              are  reported.   Note  that  UDPv6  statistics  depend on sadc's
              option "-S IPV6" to be collected.  The following values are dis-
              played (formal SNMP names between square brackets):

              idgm6/s
                     The total number of UDP datagrams delivered per second to
                     UDP users [udpInDatagrams].

              odgm6/s
                     The total number of UDP datagrams sent  per  second  from
                     this entity [udpOutDatagrams].

              noport6/s
                     The total number of received UDP datagrams per second for
                     which there was no application at  the  destination  port
                     [udpNoPorts].

              idgmer6/s
                     The  number  of  received  UDP  datagrams per second that
                     could not be delivered for reasons other than the lack of
                     an application at the destination port [udpInErrors].

              The  ALL  keyword  is  equivalent to specifying all the keywords
              above and therefore all the network activities are reported.

       -o [ filename ]
              Save the readings in the file in binary form. Each reading is in
              a  separate  record. The default value of the filename parameter
              is the current standard system activity  daily  data  file.   If
              filename  is a directory instead of a plain file then it is con-
              sidered as the directory  where  the  standard  system  activity
              daily data files are located.  The -o option is exclusive of the
              -f option.  All the data available from the kernel are saved  in
              the  file  (in  fact, sar calls its data collector sadc with the
              option "-S ALL".  See sadc(8) manual page).

       -P { cpu_list | ALL }
              Report per-processor statistics for the specified  processor  or
              processors.   cpu_list  is  a  list of comma-separated values or
              range of values (e.g., 0,2,4-7,12-).  Note that processor  0  is
              the  first  processor,  and  processor all is the global average
              among all processors.  Specifying the ALL keyword  reports  sta-
              tistics for each individual processor, and globally for all pro-
              cessors. Offline processors are not displayed.

       -p     Pretty-print device names. Use this option in  conjunction  with
              option -d.  By default names are printed as devM-n where M and n
              are the major and minor numbers for the  device.   Use  of  this
              option displays the names of the devices as they (should) appear
              in /dev.  Name  mappings  are  controlled  by  /etc/sysstat/sys-
              stat.ioconf.

       -q     Report  queue length and load averages. The following values are
              displayed:

              runq-sz
                     Run queue length (number of tasks waiting for run time).

              plist-sz
                     Number of tasks in the task list.

              ldavg-1
                     System load average for the last minute.  The load  aver-
                     age  is  calculated  as the average number of runnable or
                     running tasks (R state), and the number of tasks in unin-
                     terruptible sleep (D state) over the specified interval.

              ldavg-5
                     System load average for the past 5 minutes.

              ldavg-15
                     System load average for the past 15 minutes.

              blocked
                     Number  of  tasks  currently  blocked, waiting for I/O to
                     complete.

       -r [ ALL ]
              Report memory utilization statistics. The ALL keyword  indicates
              that  all  the memory fields should be displayed.  The following
              values may be displayed:

              kbmemfree
                     Amount of free memory available in kilobytes.

              kbavail
                     Estimate of how much memory in kilobytes is available for
                     starting  new  applications, without swapping.  The esti-
                     mate takes into account that the system needs  some  page
                     cache to function well, and that not all reclaimable slab
                     will be reclaimable, due  to  items  being  in  use.  The
                     impact of those factors will vary from system to system.

              kbmemused
                     Amount  of  used memory in kilobytes (calculated as total
                     installed memory - kbmemfree -  kbbuffers  -  kbcached  -
                     kbslab).

              %memused
                     Percentage of used memory.

              kbbuffers
                     Amount  of  memory used as buffers by the kernel in kilo-
                     bytes.

              kbcached
                     Amount of memory used to cache  data  by  the  kernel  in
                     kilobytes.

              kbcommit
                     Amount  of  memory  in kilobytes needed for current work-
                     load. This is an estimate of how much RAM/swap is  needed
                     to guarantee that there never is out of memory.

              %commit
                     Percentage of memory needed for current workload in rela-
                     tion to the total amount of memory (RAM+swap).  This num-
                     ber  may  be greater than 100% because the kernel usually
                     overcommits memory.

              kbactive
                     Amount of active memory in  kilobytes  (memory  that  has
                     been  used more recently and usually not reclaimed unless
                     absolutely necessary).

              kbinact
                     Amount of inactive memory in kilobytes (memory which  has
                     been  less  recently  used.  It  is  more  eligible to be
                     reclaimed for other purposes).

              kbdirty
                     Amount of memory in kilobytes waiting to get written back
                     to the disk.

              kbanonpg
                     Amount  of non-file backed pages in kilobytes mapped into
                     userspace page tables.

              kbslab
                     Amount of memory in kilobytes used by the kernel to cache
                     data structures for its own use.

              kbkstack
                     Amount  of  memory  in  kilobytes  used  for kernel stack
                     space.

              kbpgtbl
                     Amount of memory in kilobytes  dedicated  to  the  lowest
                     level of page tables.

              kbvmused
                     Amount  of  memory  in  kilobytes of used virtual address
                     space.

       -S     Report swap space utilization statistics.  The following  values
              are displayed:

              kbswpfree
                     Amount of free swap space in kilobytes.

              kbswpused
                     Amount of used swap space in kilobytes.

              %swpused
                     Percentage of used swap space.

              kbswpcad
                     Amount  of cached swap memory in kilobytes.  This is mem-
                     ory that once was swapped out, is  swapped  back  in  but
                     still  also  is  in the swap area (if memory is needed it
                     doesn't need to  be  swapped  out  again  because  it  is
                     already in the swap area. This saves I/O).

              %swpcad
                     Percentage  of  cached  swap  memory  in  relation to the
                     amount of used swap space.

       -s [ hh:mm[:ss] ]
              Set the starting time of the data, causing the  sar  command  to
              extract  records  time-tagged  at, or following, the time speci-
              fied. The default starting time  is  08:00:00.   Hours  must  be
              given  in 24-hour format. This option can be used only when data
              are read from a file (option -f).

       --sadc Indicate which data collector is called by  sar.   If  the  data
              collector  is  sought  in  PATH  then enter "which sadc" to know
              where it is located.

       -t     When reading data from a daily  data  file,  indicate  that  sar
              should  display the timestamps in the original local time of the
              data file creator. Without this option, the sar command displays
              the timestamps in the user's locale time.

       -u [ ALL ]
              Report  CPU  utilization. The ALL keyword indicates that all the
              CPU fields should be displayed.  The report may show the follow-
              ing fields:

              %user
                     Percentage of CPU utilization that occurred while execut-
                     ing at the user level (application). Note that this field
                     includes time spent running virtual processors.

              %usr
                     Percentage of CPU utilization that occurred while execut-
                     ing at the user level (application). Note that this field
                     does NOT include time spent running virtual processors.

              %nice
                     Percentage of CPU utilization that occurred while execut-
                     ing at the user level with nice priority.

              %system
                     Percentage of CPU utilization that occurred while execut-
                     ing  at  the  system level (kernel). Note that this field
                     includes  time  spent  servicing  hardware  and  software
                     interrupts.

              %sys
                     Percentage of CPU utilization that occurred while execut-
                     ing at the system level (kernel). Note  that  this  field
                     does  NOT  include time spent servicing hardware or soft-
                     ware interrupts.

              %iowait
                     Percentage of time that the CPU or CPUs were idle  during
                     which the system had an outstanding disk I/O request.

              %steal
                     Percentage  of time spent in involuntary wait by the vir-
                     tual CPU or  CPUs  while  the  hypervisor  was  servicing
                     another virtual processor.

              %irq
                     Percentage  of  time  spent by the CPU or CPUs to service
                     hardware interrupts.

              %soft
                     Percentage of time spent by the CPU or  CPUs  to  service
                     software interrupts.

              %guest
                     Percentage of time spent by the CPU or CPUs to run a vir-
                     tual processor.

              %gnice
                     Percentage of time spent by the CPU  or  CPUs  to  run  a
                     niced guest.

              %idle
                     Percentage of time that the CPU or CPUs were idle and the
                     system did not have an outstanding disk I/O request.

       -V     Print version number then exit.

       -v     Report status of inode, file and other kernel tables.  The  fol-
              lowing values are displayed:

              dentunusd
                     Number of unused cache entries in the directory cache.

              file-nr
                     Number of file handles used by the system.

              inode-nr
                     Number of inode handlers used by the system.

              pty-nr
                     Number of pseudo-terminals used by the system.

       -W     Report swapping statistics. The following values are displayed:

              pswpin/s
                     Total number of swap pages the system brought in per sec-
                     ond.

              pswpout/s
                     Total number of swap pages the  system  brought  out  per
                     second.

       -w     Report task creation and system switching activity.

              proc/s
                     Total number of tasks created per second.

              cswch/s
                     Total number of context switches per second.

       -y     Report TTY devices activity. The following values are displayed:

              rcvin/s
                     Number  of  receive  interrupts  per  second  for current
                     serial line. Serial line number is given in the TTY  col-
                     umn.

              xmtin/s
                     Number  of  transmit  interrupts  per  second for current
                     serial line.

              framerr/s
                     Number of frame errors  per  second  for  current  serial
                     line.

              prtyerr/s
                     Number  of  parity  errors  per second for current serial
                     line.

              brk/s
                     Number of breaks per second for current serial line.

              ovrun/s
                     Number of overrun errors per second  for  current  serial
                     line.

       -z     Tell  sar  to omit output for any devices for which there was no
              activity during the sample period.

ENVIRONMENT
       The sar command takes into account the following environment variables:

       S_COLORS
              When this variable is set, display statistics in  color  on  the
              terminal.   Possible  values for this variable are never, always
              or auto (the latter is the default).

              Note: On Debian sysstems the colors  are  displayed  by  default
              when  output is connected to the terminal, even if this variable
              is not set (i.e. unset variable is treated as if it were set  to
              auto).

              Please  note  that  the  color (being red, yellow, or some other
              color) used to display a value is not indicative of any kind  of
              issue  simply  because of the color. It only indicates different
              ranges of values.

       S_COLORS_SGR
              Specify the colors and other attributes used to display  statis-
              tics  on  the  terminal.  Its value is a colon-separated list of
              capabilities            that             defaults             to
              C=33;22:H=31;1:I=32;22:M=35;1:N=34;1:R=31;22:Z=34;22.  Supported
              capabilities are:

              C=     SGR (Select Graphic  Rendition)  substring  for  comments
                     inserted in the binary daily data files.

              H=     SGR substring for percentage values greater than or equal
                     to 75%.

              I=     SGR substring for  item  names  or  values  (eg.  network
                     interfaces, CPU number...)

              M=     SGR substring for percentage values in the range from 50%
                     to 75%.

              N=     SGR substring for non-zero statistics values.

              R=     SGR substring for restart messages.

              Z=     SGR substring for zero values.

       S_TIME_DEF_TIME
              If this variable exists and its value is UTC then sar will  save
              its  data  in  UTC  time  (data will still be displayed in local
              time).  sar will also use UTC time  instead  of  local  time  to
              determine   the   current   daily   data  file  located  in  the
              /var/log/sysstat directory. This  variable  may  be  useful  for
              servers with users located across several timezones.

       S_TIME_FORMAT
              If  this  variable  exists and its value is ISO then the current
              locale will be ignored when printing  the  date  in  the  report
              header.    The   sar  command  will  use  the  ISO  8601  format
              (YYYY-MM-DD) instead.  The timestamp will also be compliant with
              ISO 8601 format.

EXAMPLES
       sar -u 2 5
              Report  CPU  utilization  for  each  2 seconds. 5 lines are dis-
              played.

       sar -I 14 -o int14.file 2 10
              Report statistics on IRQ 14 for each 2  seconds.  10  lines  are
              displayed.  Data are stored in a file called int14.file.

       sar -r -n DEV -f /var/log/sysstat/sa16
              Display  memory  and network statistics saved in daily data file
              'sa16'.

       sar -A
              Display all the statistics saved in current daily data file.

BUGS
       /proc filesystem must be mounted for the sar command to work.

       All the statistics are not necessarily available, depending on the ker-
       nel  version  used.  sar assumes that you are using at least a 2.6 ker-
       nel.

FILES
       /var/log/sysstat/saDD
       /var/log/sysstat/saYYYYMMDD
              The standard system activity daily data files and their  default
              location.   YYYY stands for the current year, MM for the current
              month and DD for the current day.

       /proc and /sys contain various files with system statistics.

AUTHOR
       Sebastien Godard (sysstat <at> orange.fr)

SEE ALSO
       sadc(8), sa1(8), sa2(8), sadf(1),  sysstat(5),  pidstat(1),  mpstat(1),
       iostat(1), vmstat(8)

       https://github.com/sysstat/sysstat

       http://pagesperso-orange.fr/sebastien.godard/

Linux                              JULY 2018                            SAR(1)

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