Logging with MPI enabled before MPI_Init causes error #277
Description
Bug Report
Logging functions need to call MPI_Initialized to check that MPI has been initialized before trying to get rank for logging. We can simply cache the result once it succeeds so we don't call it for every log call.
Error looks like this if logging is attempted before MPI is initialized:
*** The MPI_Comm_rank() function was called before MPI_INIT was invoked.
*** This is disallowed by the MPI standard.
*** Your MPI job will now abort.
[blypc:18971] Local abort before MPI_INIT completed completed successfully, but am not able to aggregate error messages, and not able to guarantee that all other processes were killed!