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Subject: Re: [OMPI users] How do I run OpenMPI safely on a Nehalemstandalone machine?
From: Gus Correa (gus_at_[hidden])
Date: 2010-05-05 10:48:46


Hi John and Jeff

John: Thank you very much for pointing this out.
I would never knew about it without your tip.
I have yet to understand what it does
(I'm browsing the documentation now), and how
it can help understand, and perhaps monitor and allocate,
CPU/core resources.

Jeff: Should I wait for the 1.0 stable release?
Use the current stable v0.9.3?
John says one can go fearless with the 1.0 candidate release,
but I tend to chicken out at cutting edge stuff.

Thank you,
Gus Correa
---------------------------------------------------------------------
Gustavo Correa
Lamont-Doherty Earth Observatory - Columbia University
Palisades, NY, 10964-8000 - USA
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Jeff Squyres wrote:
> On May 5, 2010, at 1:14 AM, John Hearns wrote:
>
>> Regarding hyperthreading, and finding our information about your CPUs
>> in detail, there is the excellent hwloc project from OpenMPI
>>
>> http://www.open-mpi.org/projects/hwloc/
>>
>> I downloaded the 1.0 release candidate, and it compiled and ran first
>> time on Nehalem systems. Gives a superb and helpful view of core and
>> cache layout. Don't be afraid to download this version.
>
> (we hope to hit hwloc v1.0 GA very, very soon :-) )
>