PMI2 is different from PMI. Could you try configure mpich with `--with-pmi=pmi2/simple`?

-- 
Hui Zhou

From: Anne Hammond via discuss <discuss@mpich.org>
Date: Tuesday, March 30, 2021 at 5:51 PM
To: discuss@mpich.org <discuss@mpich.org>
Cc: Anne Hammond <hammond@txcorp.com>
Subject: [mpich-discuss] MPICH taking MUCH longer to run same job compared to srun

Is pmi2 different from pmi?