Comments on: CPU Performance Analysis in Linux http://www.cmdln.org/2009/01/28/cpu-performance-analysis-in-linux/ a system administrators mutterings Fri, 27 Aug 2010 19:37:45 +0000 hourly 1 http://wordpress.org/?v=3.0.1 By: Nick Anderson http://www.cmdln.org/2009/01/28/cpu-performance-analysis-in-linux/comment-page-1/#comment-788 Nick Anderson Thu, 29 Jan 2009 02:14:44 +0000 http://www.cmdln.org/2009/01/28/cpu-performance-analysis-in-linux/#comment-788 Thanks for the comment Jeff. Thanks for the comment Jeff.

]]> By: jeffatrackaid http://www.cmdln.org/2009/01/28/cpu-performance-analysis-in-linux/comment-page-1/#comment-786 jeffatrackaid Wed, 28 Jan 2009 19:25:12 +0000 http://www.cmdln.org/2009/01/28/cpu-performance-analysis-in-linux/#comment-786 In addition to iowait, a high system % can lead to a low idle time. I work on a number of LAMP stacks and insufficient table cache in mysql caused a high system % utilization. After tuning up the DB, the idle time dropped significantly. If possible, I often shutdown a service for a brief period and ruin iostat, vmstat or similar tools interactively. Sometimes you can quickly pinpoint the responsible application using this approach. In addition to iowait, a high system % can lead to a low idle time. I work on a number of LAMP stacks and insufficient table cache in mysql caused a high system % utilization. After tuning up the DB, the idle time dropped significantly.

If possible, I often shutdown a service for a brief period and ruin iostat, vmstat or similar tools interactively. Sometimes you can quickly pinpoint the responsible application using this approach.

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