Re: [OMPI users] Help with binding processes correctly in Hybrid code (Openmpi +openmp)

[Gilles Gouaillardet]

Hi,

per 
https://www2.cisl.ucar.edu/resources/computational-systems/cheyenne/running-jobs/pbs-pro-job-script-examples,
you can try

#PBS -l select=2:ncpus=16:mpiprocs=2:ompthreads=8

Cheers,

Gilles


On Tue, Nov 14, 2017 at 4:32 PM, Anil K. Dasanna
 wrote:
> Hello all,
>
> I am relatively new to mpi computing. I am doing particle simulations.
> So far, I only used pure mpi and I never had a problem. But for my system,
> its the best if one uses hybrid programming.
> But I always fail to correctly bind all processes and receive binding errors
> from cluster.
> Could one of you please clarify correct parameters for mpirun for below two
> cases:
>
> 1) I would like to use lets say two mpi tasks and 16 processors as openmp
> threads.
> I request nodes:2:ppn=16.
> 2) For the same case, how should i give parameters such that i have 4 mpi
> tasks and
> 8 openmp threads.
>
> I also tried options with --map-by and it happened that sometimes both mpi
> tasks are being selected
> from same node and other node is idle. I really appreciate your help.
> And my openmp version is 1.8.
>
>
> --
> Kind Regards,
> Anil.
> *
> "Its impossible" - said Pride
> "Its risky" - said Experience
> "Its pointless" - said Reason
> "Give it a try" - whispered the heart
> *
>
> ___
> users mailing list
> users@lists.open-mpi.org
> https://lists.open-mpi.org/mailman/listinfo/users
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[OMPI users] Help with binding processes correctly in Hybrid code (Openmpi +openmp)

[Anil K. Dasanna]

Hello all,

I am relatively new to mpi computing. I am doing particle simulations.
So far, I only used pure mpi and I never had a problem. But for my system,
its the best if one uses hybrid programming.
But I always fail to correctly bind all processes and receive binding
errors from cluster.
Could one of you please clarify correct parameters for mpirun for below two
cases:

1) I would like to use lets say two mpi tasks and 16 processors as openmp
threads.
I request nodes:2:ppn=16.
2) For the same case, how should i give parameters such that i have 4 mpi
tasks and
8 openmp threads.

I also tried options with --map-by and it happened that sometimes both mpi
tasks are being selected
from same node and other node is idle. I really appreciate your help.
And my openmp version is 1.8.


-- 
Kind Regards,
Anil.
*
"Its impossible" - said Pride
"Its risky" - said Experience
"Its pointless" - said Reason
"Give it a try" - whispered the heart
*
___
users mailing list
users@lists.open-mpi.org
https://lists.open-mpi.org/mailman/listinfo/users