Hi,
Is perf stat supposed to start all specified counters simultaneously?
For example, in the command:
perf stat -a -e rXXXX,rYYYY sleep 5
I would think that perf would configure for counting XXXX and YYYY,
and then start counting for both, so that the 2 events will have been
collected for the same amount of time.
However, looking at the perf code (and adding some logging) I see that
the first event counter is configured, then started before it then
configures and starts the 2nd event counter. Additionally, each time
it configures and starts, a global disable ("pmu_disable") is called.
So if you have many event specified, there would be a lot of starting
and stopping of all counters.
It seems like you would always want to start all the counters
simultaneously. Am I missing something? Or is there an option I can
specify to make that happen?
thanks,
chris
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