Hi Kurt, I don't have much clue. Are you able to launch some trivial applications, for example, "hostname​"? -- Hui ________________________________ From: Mccall, Kurt E. (MSFC-EV41) via discuss <[email protected]> Sent: Monday, June 13, 2022 12:29 PM To: [email protected] <[email protected]> Cc: Mccall, Kurt E. (MSFC-EV41) <[email protected]> Subject: Re: [mpich-discuss] mpiexec fails to launch any processes Outlook blocked the output file slurm.out that I had attached. Trying to send it again as slurm.txt. Kurt Hi, My mpiexec command fails to launch any processes. I ran it with the -verbose option but didn’t see any obvious errors in the output (attached). The command is: mpiexec -launcher ssh -verbose -print-all-exitcodes -wdir <directory> -np 20 -ppn 1 <more args…> I am running MPICH 4.0.1 under Slurm 20.11.8. Thanks for any help. Kurt