[mpich-discuss] Slurm and MPI_Comm_spawn

Zhou, Hui zhouh at anl.gov
Fri Jan 7 14:38:34 CST 2022

MPICH uses PMI 1 by default.

How is your MPICH configured? And how do you run your program, is it via srun?

Hui Zhou

From: Mccall, Kurt E. (MSFC-EV41) via discuss <discuss at mpich.org>
Date: Friday, January 7, 2022 at 2:21 PM
To: discuss at mpich.org <discuss at mpich.org>
Cc: Mccall, Kurt E. (MSFC-EV41) <kurt.e.mccall at nasa.gov>
Subject: [mpich-discuss] Slurm and MPI_Comm_spawn
My MPICH/Slurm job is failing when the call to MPI_Comm_spawn is made.   The Slurm MPI guide https://slurm.schedmd.com/mpi_guide.html#mpich2<https://gcc02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fslurm.schedmd.com%2Fmpi_guide.html%23mpich2&data=04%7C01%7Ckurt.e.mccall%40nasa.gov%7Ce8eee3b5265a434ed5e908d9d219ec6f%7C7005d45845be48ae8140d43da96dd17b%7C0%7C0%7C637771831057086290%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=J027PCERirTUMWvkhgqD8LJ%2FjHqGtQvDdpvApqmrlPg%3D&reserved=0> specifically states that MPI_Comm_spawn will work going through Hydra’s PMI 1.1 interface.

How do I ensure that it goes through that interface?

Maybe we’ll have to rebuild Slurm to support PMI 1.1.    This Slurm command  yields the following and PMI 1.1 is not mentioned, although PMI 2 is.

$ srun –mpi=list
srun: MPI types are...
srun: cray_shasta
srun: pmi2
srun: none

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