https://community.intel.com/t5/Software-Tuning-Performance/Bug-PCM-doesn-t-support-offline-cores/m-p/1108231#M5992 <P>Hi,</P> <P>PCM samples several events on socketRefCore<I> which remains static during PCM's run. This prevents PCM from correctly reading counter values when specific cores are offline, for example when using:&nbsp;</I></P> <PRE class="brush:bash;">$ echo 0 &gt; /sys/devices/system/cpu/cpu7/online</PRE> <P>In the above case in my system, PCM reports that energy is zero.</P> <P>Thanks,</P> <P><SPAN style="font-size: 1em; line-height: 1.5;">Tomer.</SPAN></P> Tue, 23 Aug 2016 19:18:50 GMT Tomer_M_ 2016-08-23T19:18:50Z https://community.intel.com/t5/Software-Tuning-Performance/Bug-PCM-doesn-t-support-offline-cores/m-p/1108231#M5992 <P>Hi,</P> <P>PCM samples several events on socketRefCore<I> which remains static during PCM's run. This prevents PCM from correctly reading counter values when specific cores are offline, for example when using:&nbsp;</I></P> <PRE class="brush:bash;">$ echo 0 &gt; /sys/devices/system/cpu/cpu7/online</PRE> <P>In the above case in my system, PCM reports that energy is zero.</P> <P>Thanks,</P> <P><SPAN style="font-size: 1em; line-height: 1.5;">Tomer.</SPAN></P> Tue, 23 Aug 2016 19:18:50 GMT https://community.intel.com/t5/Software-Tuning-Performance/Bug-PCM-doesn-t-support-offline-cores/m-p/1108231#M5992 Tomer_M_ 2016-08-23T19:18:50Z https://community.intel.com/t5/Software-Tuning-Performance/Bug-PCM-doesn-t-support-offline-cores/m-p/1108232#M5993 <P>Hi Tomer,</P> <P>unfortunately, changing topology while PCM is running is not something that we can support in near future.</P> <P>Thanks,</P> <P>Roman</P> Fri, 23 Sep 2016 09:10:54 GMT https://community.intel.com/t5/Software-Tuning-Performance/Bug-PCM-doesn-t-support-offline-cores/m-p/1108232#M5993 Roman_D_Intel 2016-09-23T09:10:54Z