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edited Jan 17, 2019 at 17:01

Guss

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In /proc//stat/proc/<pid>/stat I add user cpu, system cpu, child user and child system cpu together for all processes. I take a delta from a previous sample.

Immediately after I sum the user, nice and system CPU from /proc/stat/proc/stat which should be for the entire box. Again I take a delta.

The sum from the processes is almost always slightly greater than that for the overall processor and I can't figure out why.

In /proc//stat I add user cpu, system cpu, child user and child system cpu together for all processes. I take a delta from a previous sample.

Immediately after I sum the user, nice and system CPU from /proc/stat which should be for the entire box. Again I take a delta.

The sum from the processes is almost always slightly greater than that for the overall processor and I can't figure out why.

In /proc/<pid>/stat I add user cpu, system cpu, child user and child system cpu together for all processes. I take a delta from a previous sample.

Immediately after I sum the user, nice and system CPU from /proc/stat which should be for the entire box. Again I take a delta.

The sum from the processes is almost always slightly greater than that for the overall processor and I can't figure out why.

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asked Jan 16, 2019 at 16:04

user331809

Why is the sum of /proc/pid/stat CPU greater than /proc/stat

In /proc//stat I add user cpu, system cpu, child user and child system cpu together for all processes. I take a delta from a previous sample.

Immediately after I sum the user, nice and system CPU from /proc/stat which should be for the entire box. Again I take a delta.

The sum from the processes is almost always slightly greater than that for the overall processor and I can't figure out why.

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