Sar (Unix)
Unix command to collect, report or save system activity information
From Wikipedia, the free encyclopedia
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.[2]
sar | |
|---|---|
| Stable release | sysstat 12.7.6[1]
/ July 3, 2024 |
| Written in | C |
| Operating system | AIX, Linux, Solaris, HP-UX |
| Type | System reporting |
| Website | sysstat |
| Repository | github |
Platform support
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.[3]
Most Linux distributions 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,[4] 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