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

NAME         top

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

SYNOPSIS         top

       sar [ -A ] [ -B ] [ -b ] [ -C ] [ -D ] [ -d ] [ -F [ MOUNT ] ] [ -H ]
       [ -h ] [ -p ] [ -q ] [ -r [ ALL ] ] [ -S ] [ -t ] [ -u [ ALL ] ] [ -V
       ] [ -v ] [ -W ] [ -w ] [ -y ] [ --human ] [ --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         top

       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
       specified 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 collected 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
       previously 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 display 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/sa 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
       directory 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.

       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
       utilization is near 100 percent (user + nice + system), the workload
       sampled 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         top

       -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 generate I/O, because some page faults can be
                     resolved without 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
                     memory 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
                     combined into a single I/O request to the device.  A
                     transfer is of indeterminate size.

              rtps
                     Total number of read requests per second issued to
                     physical devices.

              wtps
                     Total number of write requests per second issued to
                     physical 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
              conjunction 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).  Note that disk activity
              depends on sadc options -S DISK and -S XDISK to be collected.
              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
                     combined into a single I/O request to the device.  A
                     transfer is of indeterminate size.

              rd_sec/s
                     Number of sectors read from the device. The size of a
                     sector is 512 bytes.

              wr_sec/s
                     Number of sectors written to the device. The size of a
                     sector is 512 bytes.

              avgrq-sz
                     The average size (in sectors) of the requests that were
                     issued to the device.

              avgqu-sz
                     The average queue length of the requests that were
                     issued to the device.

              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
                     servicing 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.

       -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.  Note that filesystems
              statistics depend on sadc option -S XDISK to be collected.

              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
                     privileged 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 standard system activity daily data file.  If filename
              is a directory instead of a plain file then it is considered
              as the directory where the standard system activity daily data
              files are located. The -f option is exclusive of the -o
              option.

       -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
                     allocated.

       -h     Display a short help message then exit.

       --human
              Print sizes in human readable format (e.g. 1k, 1.23M, 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 indicates 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
              number specified by the interval parameter.

       -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 prerequisite 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
                     current 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.  The following values are displayed:

              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.  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 displayed:

              FCHOST
                     Name of the fibre channel host bus adapter (HBA)
                     interface 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
                     second.

              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
              displayed (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
                     second [icmpInEchoReps].

              oech/s
                     The number of ICMP Echo (request) messages sent per
                     second [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
                     second [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
              displayed (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 displayed (formal SNMP names between square brackets):

              imsg6/s
                     The total number of ICMP messages received by the
                     interface 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
                     interface per second [ipv6IfIcmpOutEchoReplies].

              igmbq6/s
                     The number of ICMPv6 Group Membership Query messages
                     received by the interface per second
                     [ipv6IfIcmpInGroupMembQueries].

              igmbr6/s
                     The number of ICMPv6 Group Membership Response messages
                     received by the interface per second
                     [ipv6IfIcmpInGroupMembResponses].

              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
                     [ipv6IfIcmpInGroupMembReductions].

              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
                     [ipv6IfIcmpInRouterAdvertisements].

              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
                     [ipv6IfIcmpInNeighborAdvertisements].

              onbad6/s
                     The number of ICMP Neighbor Advertisement messages sent
                     by the interface per second
                     [ipv6IfIcmpOutNeighborAdvertisements].

              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 displayed (formal SNMP names between square brackets):

              ierr6/s
                     The number of ICMP messages per second which the
                     interface 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
                     [ipv6IfIcmpInDestUnreachs].

              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
              (formal SNMP names between square brackets):

              irec/s
                     The total number of input datagrams received from
                     interfaces 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
                     delivered per second to IP user-protocols (including
                     ICMP) [ipInDelivers].

              orq/s
                     The total number of IP datagrams which local IP user-
                     protocols (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
                     generated 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
              (formal 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,
                     version 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
                     successfully 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
                     processing, but which were discarded (e.g., for lack of
                     buffer 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 criterion.

              onort/s
                     The number of IP datagrams discarded per second because
                     no route could be found to transmit them to their
                     destination [ipOutNoRoutes].  Note that this counter
                     includes any packets counted in fwddgm/s which meet
                     this 'no-route' criterion.  Note that this includes any
                     datagrams 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
                     necessarily 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
                     Fragment 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 (formal SNMP names between square brackets):

              irec6/s
                     The total number of input datagrams received from
                     interfaces 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)
                     [ipv6IfStatsInDelivers].

              orq6/s
                     The total number of IPv6 datagrams which local IPv6
                     user-protocols (including ICMP) supplied per second to
                     IPv6 in requests for transmission
                     [ipv6IfStatsOutRequests].  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
                     [ipv6IfStatsReasmReqds].

              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 [ipv6IfStatsOutFragOKs].

              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 (formal 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
                     destination 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 unallocated 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
                     [ipv6IfStatsInAddrErrors].

              iukwnp6/s
                     The number of locally-addressed datagrams received
                     successfully 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 criterion.

              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
                     output interface but could not be
                     [ipv6IfStatsOutFragFails].

              itrpck6/s
                     The number of input datagrams discarded per second
                     because datagram frame didn't carry enough data
                     [ipv6IfStatsInTruncatedPkts].

              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
                     timeout).

              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
              displayed:

              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
                     terminated 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,
                     including those received in error [tcpInSegs].  This
                     count includes segments received on currently
                     established connections.

              oseg/s
                     The total number of segments sent per second, including
                     those on current connections but excluding those
                     containing 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 transition 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
                     [tcpEstabResets].

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

              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
              displayed (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 considered 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
              statistics for each individual processor, and globally for all
              processors.

       -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/sysconfig/sysstat.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
                     average is calculated as the average number of runnable
                     or running tasks (R state), and the number of tasks in
                     uninterruptible 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
                     estimate 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. This does not take
                     into account memory used by the kernel itself.

              %memused
                     Percentage of used memory.

              kbbuffers
                     Amount of memory used as buffers by the kernel in
                     kilobytes.

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

              kbcommit
                     Amount of memory in kilobytes needed for current
                     workload. 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
                     relation to the total amount of memory (RAM+swap).
                     This number 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
                     memory 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
              specified. 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
              following fields:

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

              %usr
                     Percentage of CPU utilization that occurred while
                     executing 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
                     executing at the user level with nice priority.

              %system
                     Percentage of CPU utilization that occurred while
                     executing 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
                     executing at the system level (kernel). Note that this
                     field does NOT include time spent servicing hardware or
                     software 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
                     virtual 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
                     virtual 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.

              Note: On SMP machines a processor that does not have any
              activity at all (0.00 for every field) is a disabled (offline)
              processor.

       -V     Print version number then exit.

       -v     Report status of inode, file and other kernel tables.  The
              following 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
                     second.

              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
                     column.

              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.

ENVIRONMENT         top

       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).

              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
              statistics on the terminal.  Its value is a colon-separated
              list of capabilities that defaults to
              C=36;22:H=31;1:I=32;22:M=34;1:N=33;1:R=31;22:Z=33;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/sa 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         top

       sar -u 2 5
              Report CPU utilization for each 2 seconds. 5 lines are
              displayed.

       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/sa/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         top

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

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

FILES         top

       /var/log/sa/saDD
       /var/log/sa/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         top

       Sebastien Godard (sysstat <at> orange.fr)

SEE ALSO         top

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

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

COLOPHON         top

       This page is part of the sysstat (sysstat performance monitoring
       tools) project.  Information about the project can be found at 
       ⟨http://sebastien.godard.pagesperso-orange.fr/⟩.  If you have a bug
       report for this manual page, send it to systat-AT-orange.fr.  This
       page was obtained from the project's upstream Git repository 
       ⟨https://github.com/sysstat/sysstat.git⟩ on 2017-03-13.  If you dis‐
       cover any rendering problems in this HTML version of the page, or you
       believe there is a better or more up-to-date source for the page, or
       you have corrections or improvements to the information in this
       COLOPHON (which is not part of the original manual page), send a mail
       to man-pages@man7.org

Linux                           JANUARY 2017                          SAR(1)