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Subject: Re: [OMPI users] (no subject)
From: Ralph Castain (rhc_at_[hidden])
Date: 2013-10-31 10:49:53


Yes, though the degree of impact obviously depends on the messaging pattern of the app.

On Oct 31, 2013, at 2:50 AM, MM <finjulhich_at_[hidden]> wrote:

> Of course, by this you mean, with the same total number of nodes, for e.g. 64 process on 1 node using shared mem, vs 64 processes spread over 2 nodes (32 each for e.g.)?
>
>
> On 29 October 2013 14:37, Ralph Castain <rhc_at_[hidden]> wrote:
> As someone previously noted, apps will always run slower on multiple nodes vs everything on a single node due to the shared memory vs IB differences. Nothing you can do about that one.
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