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Subject: Re: [OMPI users] Mixing Linux's CPU-shielding with mpirun's bind-to-core
From: Ralph Castain (rhc_at_[hidden])
Date: 2013-08-18 10:49:44


If you require that a specific rank go to a specific core, then use the rankfile mapper - you can see explanations on the syntax in "man mpirun"

If you just want mpirun to respect an external cpuset limitation, it already does so when binding - it will bind within the external limitation

On Aug 18, 2013, at 6:09 AM, Siddhartha Jana <siddharthajana24_at_[hidden]> wrote:

> So my question really boils down to:
> How does one ensure that mpirun launches the processes on the "specific" cores that are expected of them to be bound to.
> As I mentioned, if there were a way to specify the cores through the hostfile, this problem should be solved.
>
> Thanks for all the quick replies,
> -- Sid
>
> On 18 August 2013 09:04, Siddhartha Jana <siddharthajana24_at_[hidden]> wrote:
> Thanks John. But I have an incredibly small system. 2 nodes - 16 cores each.
> 2-4 MPI processes. :-)
>
> On 18 August 2013 09:03, John Hearns <hearnsj_at_[hidden]> wrote:
> You really should install a job scheduler.
> There are free versions.
>
> I'm not sure about cpuset support in Gridengine. Anyone?
>
>
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