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

[John Gilmore]

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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