Software Tuning, Performance Optimization & Platform Monitoring
Discussion around monitoring and software tuning methodologies, Performance Monitoring Unit (PMU) of Intel microprocessors, and platform monitoring

Bug: PCM doesn't support offline cores

Tomer_M_
Beginner
157 Views

Hi,

PCM samples several events on socketRefCore which remains static during PCM's run. This prevents PCM from correctly reading counter values when specific cores are offline, for example when using: 

$ echo 0 > /sys/devices/system/cpu/cpu7/online

In the above case in my system, PCM reports that energy is zero.

Thanks,

Tomer.

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1 Reply
Roman_D_Intel
Employee
157 Views

Hi Tomer,

unfortunately, changing topology while PCM is running is not something that we can support in near future.

Thanks,

Roman

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