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Linux.com: CLI Magic: Tracking System Performance with sar

Mar 22, 2006, 05:30 (0 Talkback[s])
(Other stories by Keith Winston)

"Sar is the 'system activity report' program found on *nix systems. In Linux, you can usually find it in the sysstat package, which includes programs and scripts to capture and summarize performance data, then produce detailed reports. This suite of programs can be useful in tracking down performance bottlenecks and providing insight into how the system is used throughout the day.

"Sadc (system activity data collector) is the program that gathers performance data. It pulls its data out of the virtual /proc filesystem, then it saves the data in a file (one per day) named /var/log/sa/saDD where DD is the day of the month..."

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