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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | ENVIRONMENT | EXAMPLES | BUGS | FILES | AUTHOR | SEE ALSO | COLOPHON |
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SAR(1) Linux User's Manual SAR(1)
sar - Collect, report, or save system activity information.
sar [ -A ] [ -B ] [ -b ] [ -C ] [ -D ] [ -d ] [ -F [ MOUNT ] ] [
-H ] [ -h ] [ -p ] [ -r [ ALL ] ] [ -S ] [ -t ] [ -u [ ALL ] ] [
-V ] [ -v ] [ -W ] [ -w ] [ -x ] [ -y ] [ -z ] [ --dec={ 0 | 1 | 2
} ] [ --dev=dev_list ] [ --fs=fs_list ] [ --help ] [ --human ] [
--iface=iface_list ] [ --int=int_list ] [ --pretty ] [ --sadc ] [
-I [ SUM | ALL ] ] [ -P { cpu_list | ALL } ] [ -m { keyword[,...]
| ALL } ] [ -n { keyword[,...] | ALL } ] [ -q [ keyword[,...] |
ALL ] ] [ -j { SID | ID | LABEL | PATH | UUID | ... } ] [ -f [
filename ] | -o [ filename ] | -[0-9]+ ] [ -i interval ] [ -s [
start_time ] ] [ -e [ end_time ] ] ] [ interval [ count ] ]
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. 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 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.
-A This is equivalent to specifying -bBdFHISvwWy -m ALL -n ALL
-q ALL -r ALL -u ALL. This option also implies specifying
-I ALL -P ALL unless these options are explicitly set on
the command line.
-B Report paging statistics. The following values are
displayed:
pgpgin/s
Total number of kibibytes the system paged in from
disk per second.
pgpgout/s
Total number of kibibytes 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.
pgprom/s
Number of pages promoted (i.e. migrated from slow to
fast memory types) by the system per second.
pgdem/s
Number of pages demoted (i.e. migrated from fast to
slow memory types) by the system per second.
-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.
dtps Total number of discard 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.
bdscd/s
Total amount of data discarded for 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 name is displayed as it (should)
appear in /dev. sar uses data in /sys to determine the
device name based on its major and minor numbers. If this
name resolution fails, sar will use name mapping controlled
by /etc/sysconfig/sysstat.ioconf file. Persistent device
names can also 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
corresponding option entry). Note that disk activity
depends on sadc's 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.
rkB/s Number of kibibytes read from the device per second.
wkB/s Number of kibibytes written to the device per
second.
dkB/s Number of kibibytes discarded for the device per
second.
areq-sz
The average size (in kibibytes) 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 servicing them.
%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
displayed by sar. dev_list is a list of comma-separated
device names.
-e [ hh:mm[:ss] ]
-e [ seconds_since_the_epoch ]
Set the ending time of the report. The default ending time
is 18:00:00. Hours must be given in 24-hour format, or as
the number of seconds since the epoch (given as a 10 digit
number). 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's
option -S XDISK to be collected.
The following values are displayed:
MBfsfree
Total amount of free space in mebibytes (including
space available only to privileged user).
MBfsused
Total amount of space used in mebibytes.
%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. Option -f is
exclusive of option -o.
--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 kibibytes that is not
yet allocated.
kbhugused
Amount of hugepages memory in kibibytes that has
been allocated.
%hugused
Percentage of total hugepages memory that has been
allocated.
kbhugrsvd
Amount of reserved hugepages memory in kibibytes.
kbhugsurp
Amount of surplus hugepages memory in kibibytes.
-h This option is equivalent to specifying --pretty --human.
--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. kibibytes, sectors...)
associated with the metrics.
-I [ SUM | ALL ]
Report statistics for interrupts. The values displayed are
the number of interrupts per second for the given processor
or among all processors. A list of interrupts can be
specified using --int= (see this option). 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 are to be reported (this is
the default). Note that interrupts statistics depend on
sadc's 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.
--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.
--int=int_list
Specify the interrupts names for which statistics are to be
displayed by sar. int_list is a list of comma-separated
values or range of values (e.g., 0-16,35,40-).
-j { SID | ID | LABEL | PATH | UUID | ... }
Display persistent device names. Use this option in
conjunction with option -d. Keywords ID, LABEL, etc.
specify the type of the persistent name. These keywords are
not limited, only prerequisite is that directory with
required persistent names is present in /dev/disk. Keyword
SID tries to get a stable identifier to use as the device
name. A stable identifier won't change across reboots for
the same physical device. If it exists, this identifier is
normally the WWN (World Wide Name) of the device, as read
from the /dev/disk/by-id directory.
-m { keyword[,...] | ALL }
Report power management statistics. Note that these
statistics depend on sadc's option -S POWER to be
collected.
Possible keywords are BAT, CPU, FAN, FREQ, IN, TEMP and
USB.
With the BAT keyword, statistics about batteries capacity
are reported. The following values are displayed:
%cap Battery capacity.
cap/min
Capacity lost or gained per minute by the battery.
status Charging status of the battery: ↑ (full), ↗
(charging), → (not charging), ↘ (discharging), ?
(unknown).
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. Statistics for all network interfaces 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.
rxpck/s
Total number of packets received per second.
txpck/s
Total number of packets transmitted per second.
rxkB/s Total number of kibibytes received per second.
txkB/s Total number of kibibytes 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 interfaces 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 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.
blg_len
The length of the network backlog.
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].
retrseg/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.
Option -o is exclusive of option -f. 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. Offline
processors are not displayed.
-p, --pretty
Make reports easier to read by a human. This option may be
especially useful when displaying e.g., network interfaces
or block devices statistics.
-q [ keyword[,...] | ALL ]
Report system load and pressure-stall statistics.
Possible keywords are CPU, IO, LOAD, MEM and PSI.
With the CPU keyword, CPU pressure statistics are reported.
The following values are displayed:
%scpu-10
Percentage of the time that at least some runnable
tasks were delayed because the CPU was unavailable
to them, over the last 10 second window.
%scpu-60
Percentage of the time that at least some runnable
tasks were delayed because the CPU was unavailable
to them, over the last 60 second window.
%scpu-300
Percentage of the time that at least some runnable
tasks were delayed because the CPU was unavailable
to them, over the last 300 second window.
%scpu Percentage of the time that at least some runnable
tasks were delayed because the CPU was unavailable
to them, over the last time interval.
With the IO keyword, I/O pressure statistics are reported.
The following values are displayed:
%sio-10
Percentage of the time that at least some tasks lost
waiting for I/O, over the last 10 second window.
%sio-60
Percentage of the time that at least some tasks lost
waiting for I/O, over the last 60 second window.
%sio-300
Percentage of the time that at least some tasks lost
waiting for I/O, over the last 300 second window.
%sio Percentage of the time that at least some tasks lost
waiting for I/O, over the last time interval.
%fio-10
Percentage of the time during which all non-idle
tasks were stalled waiting for I/O, over the last 10
second window.
%fio-60
Percentage of the time during which all non-idle
tasks were stalled waiting for I/O, over the last 60
second window.
%fio-300
Percentage of the time during which all non-idle
tasks were stalled waiting for I/O, over the last
300 second window.
%fio Percentage of the time during which all non-idle
tasks were stalled waiting for I/O, over the last
time interval.
With the LOAD keyword, queue length and load averages
statistics are reported. The following values are
displayed:
runq-sz
Run queue length (number of tasks running or 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.
With the MEM keyword, memory pressure statistics are
reported. The following values are displayed:
%smem-10
Percentage of the time during which at least some
tasks were waiting for memory resources, over the
last 10 second window.
%smem-60
Percentage of the time during which at least some
tasks were waiting for memory resources, over the
last 60 second window.
%smem-300
Percentage of the time during which at least some
tasks were waiting for memory resources, over the
last 300 second window.
%smem Percentage of the time during which at least some
tasks were waiting for memory resources, over the
last time interval.
%fmem-10
Percentage of the time during which all non-idle
tasks were stalled waiting for memory resources,
over the last 10 second window.
%fmem-60
Percentage of the time during which all non-idle
tasks were stalled waiting for memory resources,
over the last 60 second window.
%fmem-300
Percentage of the time during which all non-idle
tasks were stalled waiting for memory resources,
over the last 300 second window.
%fmem Percentage of the time during which all non-idle
tasks were stalled waiting for memory resources,
over the last time interval.
The PSI keyword is equivalent to specifying CPU, IO and MEM
keywords together and therefore all the pressure-stall
statistics are reported.
The ALL keyword is equivalent to specifying all the
keywords above and therefore all the statistics are
reported.
-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 kibibytes.
kbavail
Estimate of how much memory in kibibytes 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. If not
provided by the kernel, this field is the same as
kbmemfree.
kbmemused
Amount of used memory in kibibytes (calculated as
total installed memory - kbavail).
%memused
Percentage of used memory.
kbbuffers
Amount of memory used as buffers by the kernel in
kibibytes.
kbcached
Amount of memory used to cache data by the kernel in
kibibytes.
kbcommit
Amount of memory in kibibytes 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 kibibytes (memory that
has been used more recently and usually not
reclaimed unless absolutely necessary).
kbinact
Amount of inactive memory in kibibytes (memory which
has been less recently used. It is more eligible to
be reclaimed for other purposes).
kbdirty
Amount of memory in kibibytes waiting to get written
back to the disk.
kbshmem
Amount of shared memory in kibibytes (memory mostly
used by tmpfs).
kbanonpg
Amount of non-file backed pages in kibibytes mapped
into userspace page tables.
kbslab Amount of memory in kibibytes used by the kernel to
cache data structures for its own use.
kbkstack
Amount of memory in kibibytes used for kernel stack
space.
kbpgtbl
Amount of memory in kibibytes dedicated to the
lowest level of page tables.
kbvmused
Amount of memory in kibibytes of used virtual
address space.
-S Report swap space utilization statistics. The following
values are displayed:
kbswpfree
Amount of free swap space in kibibytes.
kbswpused
Amount of used swap space in kibibytes.
%swpused
Percentage of used swap space.
kbswpcad
Amount of cached swap memory in kibibytes. 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] ]
-s [ seconds_since_the_epoch ]
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, or as the number of
seconds since the epoch (given as a 10 digit number). 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 local 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.
-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. The
following values are displayed:
proc/s Total number of tasks created per second.
cswch/s
Total number of context switches per second.
-x Extended reports: Display minimum and maximum values in
addition to average ones at the end of the report.
-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.
-z Tell sar to omit output for any devices for which there was
no activity during the sample period.
The sar command takes into account the following environment
variables:
S_COLORS
By default statistics are displayed in color when the
output is connected to a terminal. Use this variable to
change the settings. Possible values for this variable are
never, always or auto (the latter is equivalent to the
default settings).
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=33;22:I=32;22:N=34;1:R=31;22:W=35;1:X=31;1:Z=34;22+=32;1:-=31;1.
Supported capabilities are:
C= SGR (Select Graphic Rendition) substring for
comments inserted in the binary daily data files.
I= SGR substring for item names or values (eg. network
interfaces, CPU number...)
N= SGR substring for non-zero statistics values.
R= SGR substring for restart messages.
W= (or M=)
SGR substring for percentage values in the range
from 75% to 90% (or in the range 10% to 25%
depending on the metric's meaning). It is also used
for negative values in the range from -10 to -5.
X= (or H=)
SGR substring for percentage values greater than or
equal to 90% (or lower than or equal to 10%
depending on the metric's meaning). It is also used
for negative values lower than or equal to -10.
Z= SGR substring for zero values.
+= SGR substring for battery status (full or charging).
-= SGR substring for battery status (not charging or
discharging).
S_REPEAT_HEADER
This variable contains the maximum number of lines after
which a header has to be displayed by sar when the output
is not a terminal.
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.
sar -u 2 5
Report CPU utilization for each 2 seconds. 5 lines are
displayed.
sar -I --int=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.
/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.
Although sar displays units correspondind to kilobytes (kB),
megabytes (MB)..., it actually uses kibibytes (kiB), mebibytes
(MiB)... A kibibyte is equal to 1024 bytes, and a mebibyte is
equal to 1024 kibibytes.
/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.
Sebastien Godard (sysstat <at> orange.fr)
sadc(8), sa1(8), sa2(8), sadf(1), sysstat(5), pidstat(1),
mpstat(1), iostat(1), vmstat(8)
https://github.com/sysstat/sysstat
https://sysstat.github.io/
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 sysstat-AT-orange.fr.
This page was obtained from the project's upstream Git repository
⟨https://github.com/sysstat/sysstat.git⟩ on 2025-08-11. (At that
time, the date of the most recent commit that was found in the
repository was 2025-08-04.) If you discover 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
[email protected]
Linux AUGUST 2025 SAR(1)
Pages that refer to this page: cifsiostat(1), iostat(1), mpstat(1), pidstat(1), pmrep(1), sadf(1), sar2pcp(1), sa1(8), sa2(8), sadc(8), vmstat(8)
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