Heterogeneous CPU Cores With OpenMP

By: Mark Heath (none.delete@this.none.none), February 1, 2023 6:42 am
Room: Moderated Discussions
Freddie (freddie.delete@this.witherden.org) on February 1, 2023 4:05 am wrote:
> Guided scheduling can work nicely here.

Guided scheduling has the overhead of a work queue, like dynamic scheduling. OpenMP has an auto schedule policy. If the OpenMP runtime is really smart, it could measure the performance of the P-cores and E-cores for a few iterations and then do a static schedule for the rest of the iterations. Does this seem practical?

Jukka Larja (roskakori2006.delete@this.gmail.com) on February 1, 2023 5:24 am wrote:
> So does OpenMP see P-core as just one core, instead of two SMT cores? Or does your code just run so much better on P-core that one SMT P-core is better than two E-cores?

If SMT is enabled in the BIOS, OpenMP will see the physical P-core as 2 virtual cores. I think the relative speed of a virtual P core compared to an E-core (which aren’t capable of SMT) depends on the application and the characteristics of the cores.
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