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PAPI counts events per device (which can be iMC, caching and home agent(cha)). These are counted as separate events such as skx_unc_imc0::UNC_M_RPQ_OCCUPANCY for iMC 0. Is there a way to measure this for all the iMCs at the same time? The Linux perf tool can do this, an equivalent event is unc_m_rpq_occupancy, but this cannot be measured from PAPI.

Vishal Deka
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  • If there's no way to do it from PAPI, I'd guess that `perf` does it manually, by counting the event for each IMC, and summing them itself. That would make some sense, keeping the kernel API simple when user-space can get get accurate counts by doing the work itself. – Peter Cordes Jan 06 '23 at 09:25

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