Are you able to use mpirun to launch a non-MPI application? E.g.: mpirun -np 2 hostname
And if that works, can you run the simple example MPI apps in the "examples" directory of the MPI source tarball (the "hello world" and "ring" programs)? E.g.: cd examples make mpirun -np 4 hello_c mpirun -np 4 ring_c -- Jeff Squyres jsquy...@cisco.com ________________________________________ From: users <users-boun...@lists.open-mpi.org> on behalf of Scott Sayres via users <users@lists.open-mpi.org> Sent: Tuesday, May 3, 2022 1:07 PM To: users@lists.open-mpi.org Cc: Scott Sayres Subject: [OMPI users] mpirun hangs on m1 mac w openmpi-4.1.3 Hello, I am new to openmpi, but would like to use it for ORCA calculations, and plan to run codes on the 10 processors of my macbook pro. I installed this manually and also through homebrew with similar results. I am able to compile codes with mpicc and run them as native codes, but everything that I attempt with mpirun, mpiexec just freezes. I can end the program by typing 'control C' twice, but it continues to run in the background and requires me to 'kill <pid>'. even as simple as 'mpirun uname' freezes I have tried one installation by: 'arch -arm64 brew install openmpi ' and a second by downloading the source file, './configure --prefix=/usr/local', 'make all', make install the commands: 'which mpicc', 'which 'mpirun', etc are able to find them on the path... it just hangs. Can anyone suggest how to fix the problem of the program hanging? Thanks! Scott
