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Subject: Re: [OMPI devel] poor btl sm latency
From: Matthias Jurenz (matthias.jurenz_at_[hidden])
Date: 2012-02-16 11:12:59


Thanks for the hint, Brice.
I'll forward this bug report to our cluster vendor.

Could this be the reason for the bad latencies with Open MPI or does it only
affect hwloc/lstopo?

Matthias

On Thursday 16 February 2012 15:46:46 Brice Goglin wrote:
> Le 16/02/2012 15:39, Matthias Jurenz a écrit :
> > Here the output of lstopo from a single compute node. I'm wondering that
> > the fact of L1/L2 sharing isn't visible - also not in the graphical
> > output...
>
> That's a kernel bug. We're waiting for AMD to tell the kernel that L1i
> and L2 are shared across dual-core modules. If you have some contact at
> AMD, please tell them to look at
> https://bugzilla.kernel.org/show_bug.cgi?id=42607
>
> Brice
>
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