[mpich-discuss] How to use ppr with mpiexec?

[Jeffrey Layton]

Thanks! I used the second option and it worked just fine.

Thanks for the help!

Jeff


On Tue, Oct 8, 2024 at 11:32 AM Zhou, Hui <zhouh at anl.gov> wrote:

> If you are using hydra – the default launcher installed with MPICH, the
> “-hosts” option accepts a comma separated list, so something like “-hosts
> node1:4,node2:4,node3:4”. The “:4” tells the launcher to assign 4 processes
> per host, so you don’t need another “-map-by” option. Alternatively, you
> could use “-hosts node1,node2,node3 -ppn 4” for the same effect.
>
>
>
> --
> Hui Zhou
>
>
>
>
>
> *From: *Jeffrey Layton via discuss <discuss at mpich.org>
> *Date: *Tuesday, October 8, 2024 at 6:50 AM
> *To: *discuss at mpich.org <discuss at mpich.org>
> *Cc: *Jeffrey Layton <laytonjb at gmail.com>
> *Subject: *[mpich-discuss] How to use ppr with mpiexec?
>
> Good morning, I'm trying to "port" an Open MPI script with MPICH and I'm
> having some trouble. I've got a few questions. What is the form of the
> "-hosts" option? Is it something like '-hosts node1: 4 node2: 4
>
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> Good morning,
>
>
>
> I'm trying to "port" an Open MPI script with MPICH and I'm having some
> trouble. I've got a few questions.
>
> 1.  What is the form of the "-hosts" option? Is it something like '-hosts
> node1:4 node2:4 node3:4 ...'?
>
> 2.  The Open MPI script has an option "-map-by ppr:4:node" that tells it
> to run 4 processes per node and then it runs as many nodes as needed to
> meet the number of processes. How can I do this in MPICH?
>
> Thanks for the help!
>
>
>
> Jeff
>
>
>
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