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Sar (Unix) 
Summary
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 /proc filesystem 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 |
Platform support edit
Sar was originally developed for the Unix System V operating system; it is available in AIX, HP-UX, Solaris and other System V based operating systems but it is not available for macOS or FreeBSD. Prior to 2013 there was a bsdsar tool, but it is now deprecated.[4]
Most Linux distributions provide sar utility through the sysstat package.
Syntax edit
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 edit
[user@localhost]$ sar # Displays current CPU activity.
Sysstat package edit
Additional to sar command, Linux sysstat package in Debian,[5] 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 edit
References edit
- – Solaris 11.4 User Commands Reference Manual
- Easy system monitoring with SAR (IBM developerWorks)
- System Activity Reporter (Softpanorama)
- Article on sar at Computerhope
Footnotes edit
- ^ "Release v12.1.1: Sysstat-12.1.1 · sysstat/Sysstat". GitHub.
- ^ "SYSSTAT". sebastien.godard.pagesperso-orange.fr.
- ^ "SYSSTAT". sebastien.godard.pagesperso-orange.fr.
- ^ "FreshPorts -- sysutils/bsdsar: System Activity Reporter for FreeBSD". www.freshports.org.
- ^ "Debian -- Details of package sysstat in sid". packages.debian.org.
- ^
"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.