Hi Sudhakar, Was that the completed error message? Seems missing a few lines. -- Hui Zhou From: Sudhakar D via discuss <[email protected]> Reply-To: "[email protected]" <[email protected]> Date: Sunday, May 17, 2020 at 3:10 PM To: "[email protected]" <[email protected]> Cc: Sudhakar D <[email protected]> Subject: [mpich-discuss] MPI_Barrier(comm=MPI_COMM_WORLD) failed Hello, Some times I see the below error when running my python app across two nodes. Just wondering under what conditions we get the below error? I am using 3.3.1 version regards, Sudhakar PMPI_Barrier(289)...................: MPI_Barrier(comm=MPI_COMM_WORLD) failed PMPI_Barrier(275)...................: MPIR_Barrier_impl(175)..............: MPIR_Barrier_intra_auto(110)........: MPIR_Barrier_intra_dissemination(49): MPIC_Sendrecv(344)..................: