[mvapich-discuss] Question about NUMA support in mvapich2-1.2 (and later)

[Hari Subramoni]

Hi Craig,

MVAPICH2 supports user defined CPU mapping through Portable Linux
Processor Affinity (PLPA) library.

The MVAPICH2 user guide provides detailed instructions on how to run
applications with user desired core mapping. Please refer the following
link for more information...

https://mvapich.cse.ohio-state.edu/support/user_guide_mvapich2-1.4rc1.html#x1-360006.8

Please let us know if you face any issues with this.

Thx,
Hari.

On Fri, 10 Jul 2009, Craig Tierney wrote:

> The mvapich2 documentation states:
>
> Optimized for Bus-based SMP and NUMA-Based SMP systems.
>
> But I cannot find any other reference to what exactly
> mvapich2 does for NUMA-Based systems (like nehalem).  Simple
> tests have shown that I cannot use numactl to explicitly
> lay out MPI processes to improve performance for memory
> bandwidth sensitive applications over just running
> the application directly with mpirun.   But I would like
> to understand what is being done by mvapich2.
>
> Thanks,
> Craig
> --
> Craig Tierney (craig.tierney at noaa.gov)
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