[OMPI users] Confusions on building and running OpenMPI over Slingshot 10 on Cray EX HPC

Hi, I'm trying to build an OpenMPI 5.0.3 environment on the Cray EX HPC with Slingshot 10 support. General speaking, there were error messages while building OpenMPI, and make check also didn't report any failure. While tested OpenMPI Env. with a simple 'hello world' MPI Fortran codes, it

[OMPI users] How to launch MPMD with partial oversubscription?

Hi, PBS version : 2021.1.3 OpenMPI : 5.0.3 I’d like to do a partial oversubscription with MPMD, like this 1. Request 40 trunks in total 2. First group of 32 trunks with 128 cores per trunk, 1 MPI rank per core, 1 OMP threads per MPI rank 3. Second group of 8 trunks with 128 cores per tru