How to calculate total CPU usage from SAR report?

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Operating Systems Linux How to calculate total CPU usage from SAR report?

09-17-2012

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How to calculate total CPU usage from SAR report?

Hi,
I want to calculate the total cpu usage from the sar report. Say for example,

Code:

Linux 2.6.24-21-generic (blade10)       09/10/2012

04:54:36 PM     CPU     %user     %nice   %system   %iowait    %steal     %idle
04:54:37 PM     all          0.00         0.00      0.00         0.00          0.00       100.00
04:54:38 PM     all          0.48         0.00      0.48         0.48           0.00        98.56
04:54:39 PM     all          0.00         0.00      0.95         0.00           0.00        99.05
04:54:40 PM     all          0.00         0.00      0.45         0.00           0.00        99.55
04:54:41 PM     all          0.46         0.00      0.91         0.00           0.00        98.63

Is it %user+%nice+%system = total CPU Usage?

Last edited by Corona688; 09-17-2012 at 12:31 PM..

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Ignore the first line except the time stamp, subtract each time stamp from the prior to get seconds, convert to float (or milliseconds big integer?) and multiply by (1.0 - (% idle/100.0)) and accumulate this as the total CPU seconds used. For multiple CPU/core, multiply by the total core count.

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