There is no setting to peek inside `MPI_Fianlize`. You can use debugger to check. -- Hui Zhou From: Erik Schnetter <[email protected]> Date: Tuesday, November 30, 2021 at 9:54 AM To: Zhou, Hui <[email protected]> Cc: [email protected] <[email protected]> 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?