[mvapich-discuss] [hydra] one MPI process per node (-bynode)

[Christian Krause]

Thanks, but that is not what we are looking for. Since we are using
the "sge" launcher of hydra we don't need to work with hostfiles
because the launcher gets this information directly from the grid
engine.

On Wed, Dec 19, 2012 at 8:49 PM, John Gilmore
<john.gilmore at vastech.co.za> wrote:
> Hi,
>
> I haven't worked with MPI+OpenMP, but you can generally also use a hostfile to spawn one process per node. Sorry if OpenMP is a special case I don't know about.
>
> mpiexec -hostfile filepath/filename
>
> The file then has the form:
> hostname1:1
> hostname2:1
> hostname3:1
>
> This will spawn one process on each of hosts 1, 2 and 3.
>
> The numbers after the hostname determine how many processes to spawn there.
>
> I don't know if this answers your question?
>
> Regards
> John
>
> On 19 Dec 2012, at 15:41, Christian Krause <kizkizzbangbang at googlemail.com> wrote:
>
>> Hello,
>>
>> Is it possible with the hydra launcher to start one MPI process per node?
>>
>> We currently want to support hybrid MPI / OpenMP jobs at our cluster
>> for MVAPICH. We are using hydra to tightly integrate MVAPICH with the
>> Sun Grid Engine.
>>
>> We also support OpenMPI which has a "-bynode" parameter to start one
>> MPI process per node, which is really useful for starting hybrid MPI /
>> OpenMP jobs.
>>
>> Is there something like "-bynode" for the hydra (or another) launcher?
>> I've browsed through the man page but unfortunately found nothing.
>>
>> Best Regards
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>