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intel / PerfSpect

System performance characterization tool based on linux perf
https://intel.github.io/PerfSpect/
BSD 3-Clause "New" or "Revised" License
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metric_CPU utilization (%) > 100 #8

Closed jasonneverstop closed 1 year ago

jasonneverstop commented 2 years ago

When I use 'perfspect -p' to target only one process,the metric_CPU utilization is greater than 100.I want to know why and how to solve it.

hilldani commented 1 year ago

Thanks for bringing this up. Some hardware events dont translate perfectly to the pid mode of perf. I will look into whether this is the case or not for cpu utilization and get back to you / update pid mode

ashrafMahgoub commented 1 year ago

@jasonneverstop Thank you for reporting this issue. The metric CPU utilization uses reference cycles to identify the utilization % for a given pid. Since reference cycles does not account for dynamic changes to the clock frequency, the value can sometimes exceed 100% with the current implementation. We will add a fix for this issue in the next release.

ashrafMahgoub commented 1 year ago

@jasonneverstop We now released V1.2.3 with a the fix for this issue: https://github.com/intel/PerfSpect/releases/tag/1.2.3. Please try it out and let us know your feedback.

jasonneverstop commented 1 year ago

@jasonneverstop We now released V1.2.3 with a the fix for this issue: https://github.com/intel/PerfSpect/releases/tag/1.2.3. Please try it out and let us know your feedback. Thank you for helping to solve this problem. I will verify this issue in future work. Thank you for your contribution to this project, which has been very helpful to us.