[mvapich-discuss] RHEL6.5 and MVAPICH2

[Glenn K. Lockwood]

Mehmet,

Did you patch your kernel after upgrading?  There was a severe performance
regression in EL 6.5 related to the Linux thread scheduler:

https://bugs.centos.org/view.php?id=6949

Glenn


On Fri, Aug 29, 2014 at 12:15 PM, Mehmet Belgin <
mehmet.belgin at oit.gatech.edu> wrote:

> Hi Everyone,
>
> We upgraded from RHEL 6.3 to 6.5 recently and started noticing some
> performance fluctuations and increased level of sensitivity to core
> affinity (i.e. more gap between no affinity and affinity). Maybe this is
> selective bias, but we feel like mvapich2 (2.0rc1 build) performance
> characteristics have changed (not necessarily degraded, but seeing more
> inconsistency between runs).
>
> Just pinging the list in case others might have observed this as well. Any
> feedback on this will be very much appreciated!
>
> Thanks,
> -Mehmet (Georgia Tech)
>
>
>
>
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