There is no setting to peek inside `MPI_Fianlize`. You can use debugger to check.

-- 
Hui Zhou

From: Erik Schnetter <schnetter@gmail.com>
Date: Tuesday, November 30, 2021 at 9:54 AM
To: Zhou, Hui <zhouh@anl.gov>
Cc: discuss@mpich.org <discuss@mpich.org>
Subject: Re: [mpich-discuss] Why stuck in MPI_Finalize?

Is there a way to see what is happening during MPI_Finalize, maybe
some kind of `verbose` setting?