This usually means that you have accidentally switched to using a different MPI implementation under the covers somehow. E.g., did you somehow accidentally start using mpiexec from MPICH instead of Open MPI? Or did MPI4Py somehow get upgraded or otherwise re-build itself for MPICH, but you're still using the mpiexec from Open MPI? Stuff like that. ________________________________ From: users <users-boun...@lists.open-mpi.org> on behalf of caitlin lamirez via users <users@lists.open-mpi.org> Sent: Wednesday, October 25, 2023 11:57 AM To: users@lists.open-mpi.org <users@lists.open-mpi.org> Cc: caitlin lamirez <caitlin.lami...@yahoo.com> Subject: [OMPI users] MPI4Py Only Using Rank 0
Hello, I am having a problem with MPI4Py (version: mpiexec (OpenRTE) 4.1.5). I have been using it for months without a problem, however, out of no where, I am getting a bug where my program is only using Rank 0. For example, when I run the command: mpiexec -n 5 python -m mpi4py.bench helloworld I get the following output: Hello, World! I am process 0 of 1 on Caitlins-MacBook-Air.local. Hello, World! I am process 0 of 1 on Caitlins-MacBook-Air.local. Hello, World! I am process 0 of 1 on Caitlins-MacBook-Air.local. Hello, World! I am process 0 of 1 on Caitlins-MacBook-Air.local. Hello, World! I am process 0 of 1 on Caitlins-MacBook-Air.local. I have not changed anything with my system. I was wondering if I can get some help on this issue? Thank you, Caitlin Lamirez
