topic Re: mpirun -ppn option does not work. in Intel® MPI Library

mpirun -ppn option does not work.

ccopemem — Thu, 16 Jan 2025 02:34:48 GMT

Hello,

We use OneAPI on IBM Spectrum LSF environment.

Now we are facing that "mpirun -np 2 -ppn 1 ./mpi-program.out" does not work.

It always run all processes on same node.

LSF support said it is not related LSF.

What does it caused by ?

And how do we investigate this issue ?

TobiasK — Mon, 20 Jan 2025 10:09:13 GMT

@ccopemem can you please provide the output of I_MPI_DEBUG=10 and I_MPI_HYDRA_DEBUG=1?

ccopemem — Tue, 28 Jan 2025 02:08:37 GMT

Hi TobiasK,

Thank you for your reply and big hint.

I got this output with I_MPI_DEBUG=10 and I_MPI_HYDRA_DEBUG=1.

Both I_MPI_JOB_RESPECT_PROCESS_PLACEMENT and ppn = 1 specified, defaulting to scheduler-supplied value.

-ppn worked fine by specified I_MPI_JOB_RESPECT_PROCESS_PLACEMENT=disable.

We appreciate for your kind support.

TobiasK — Mon, 03 Feb 2025 10:45:35 GMT

@ccopemem
I don't see any logs, but I guess this is solved now?

ccopemem — Wed, 05 Feb 2025 03:28:08 GMT

Hi TobiasK,

Thank you for your following.

I don't see any logs, but I guess this is solved now?

Yes, it is solved.

We appreciate your kindly support and big hint.