PMI2 is different from PMI. Could you try configure mpich with `--with-pmi=pmi2/simple`? -- Hui Zhou From: Anne Hammond via discuss <[email protected]> Date: Tuesday, March 30, 2021 at 5:51 PM To: [email protected] <[email protected]> Cc: Anne Hammond <[email protected]> Subject: [mpich-discuss] MPICH taking MUCH longer to run same job compared to srun Is pmi2 different from pmi?