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Subject: Re: [OMPI users] Oversubscribing a subset of a machine's cores
From: Joe Landman (landman_at_[hidden])
Date: 2008-02-07 08:47:21


Torje Henriksen wrote:

[...]

> Still, all eight cores are being used. I can see why you would want to
> use all cores, and I can see that oversubscribing a sub-set of the
> cores might seem silly. My question is, is it possible to do what I
> want to do without hacking the open mpi code?

Could you get numactl to help you do what you want? That is, for the
code, somehow tweak the launcher to run

        numactl --physcpubind=X ...

or similar?

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Joseph Landman, Ph.D
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