From: Timo Heister <timo.heister@gmail.com>
Date: Tue, 24 Mar 2020 14:32:17 +0000 (-0400)
Subject: MPI: silence "avoid a deadlock" error message
X-Git-Tag: v9.2.0-rc1~371^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=742c5dcce2bd2e3aa008c081c0a7d90341996518;p=dealii.git

MPI: silence "avoid a deadlock" error message

When an exception occurs (solver convergence, out of memory, etc..), we
end up printing an error message from every single MPI rank. I have
never used this information in practice and it produces a lot of
unnecessary noise. Even worse, it produces gigantic, useless log files
when running with 100k+ MPI ranks. Therefore, I proposed removing this
altogether.
---

diff --git a/source/base/mpi.cc b/source/base/mpi.cc
index 3d7fe8b5e3..d0a62bc9bb 100644
--- a/source/base/mpi.cc
+++ b/source/base/mpi.cc
@@ -976,11 +976,7 @@ namespace Utilities
           if (std::uncaught_exception() == true)
 #  endif
             {
-              std::cerr
-                << "ERROR: Uncaught exception in MPI_InitFinalize on proc "
-                << this_mpi_process(MPI_COMM_WORLD)
-                << ". Skipping MPI_Finalize() to avoid a deadlock."
-                << std::endl;
+              // do not try to call MPI_Finalize to avoid a deadlock.
             }
           else
             {