sar (Unix)
System Activity Report (sar) is a Unix System V-derived system monitor command used to report on various system loads, including CPU activity, memory/paging, interrupts, device load, network and swap space utilization. Sar uses /procfilesystem for gathering information [3]
| Stable release | sysstat 12.1.1[1]
/ October 13, 2018 |
|---|---|
| Preview release | sysstat 11.7.4
/ June 1, 2018 [2] |
| Repository | github |
| Written in | C |
| Operating system | AIX, Linux, Solaris, HP-UX |
| Type | System reporting |
| Website | sebastien |
Called regularly by cron, sadc does the monitoring and stores its measurements to files in the /var/log/sa/ folder. The sar client can be used to explore this data.
Platform support
Sar was originally developed for Solaris operating system[4] and it is available in Linux, Solaris, AIX, HP-UX, but it is not available for macOS or FreeBSD, until 2013 there was a bsdsar tool actually deprecated [5].
Linux distributions, such as Debian, Red Hat Enterprise Linux, SuSe[6] and Ubuntu provide sar utility through the sysstat package.
Syntax
sar [-flags] [ -e time ] [ -f filename ] [-i sec ] [ -s time ]
- -f
- filename Uses filename as the data source for sar. The default is the current daily data file /var/adm/sa/sadd.
- -e
- time Selects data up to time. The default is 18:00.
- -i
- sec Selects data at intervals as close as possible to sec seconds.
Example
[user@localhost]$ sar # Displays current CPU activity.
Sysstat package
Additional to sar command, Linux sysstat package in Debian[7], RedHat Enterprise Linux and SuSE provides additional reporting tools:
- : Collect, report, or save system activity information. – Linux User Commands Manual
- : Collect and store binary data in the system activity daily data file. – Linux Administration and Privileged Commands Manual
- : shell variant of
sar, supporting the same flags assarcommand which write a daily report in the /var/log/sa directory. – Linux Administration and Privileged Commands Manual - : , similar to
sarbut can write its data in different formats (CSV, XML, etc.). This is useful to load performance data into a database, or import them in a spreadsheet to make graphs. - : reports basic CPU statistics and input/output statistics for devices, partitions and network filesystems. – Linux User Commands Manual
- : reports individual or combined processor related statistics. – Linux User Commands Manual
- : reports statistics for Linux tasks (processes) : I/O, CPU, memory, etc. – Linux User Commands Manual
- : reports input/output statistics for network filesystems (NFS). – Linux User Commands Manual
- : reports I/O statistics for CIFS resources. – Linux User Commands Manual
See also
- atopsar
- Nmon
sag- "system activity graph" command[8]- ksar- BSD licensed Java-based application to create graph of all parameters from the data collected by Unix sar utilities.
- CURT, IBM AIX CPU Usage Reporting Tool
- isag, tcl based command to plot sar/sysstat data
References
Footnotes
- https://github.com/sysstat/sysstat/releases/tag/v12.1.1
- http://sebastien.godard.pagesperso-orange.fr/
- http://sebastien.godard.pagesperso-orange.fr/man_sar.html
- https://www.itworld.com/article/2786092/open-source-tools/unix-tip--using-sar-for-long-term-performance-analysis.html
- https://www.freshports.org/sysutils/bsdsar
- http://www.softpanorama.org/Admin/Monitoring/sar.shtml
- https://packages.debian.org/sid/sysstat
-
"sag(1)" (PDF). SUNOS Reference Manual. Mountain View, California: Sun Microsystems. 1993-02-24. pp. 1–895. Retrieved 2010-05-04.
sag - system activity graph [...] DESCRIPTION sag graphically displays the system activity data stored in a binary data file by a previous sar(1) run.
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