What does “MPIDI_PORTALSU_REQUEST_FDU_OR_AEP: DROPPED EVENT ON UNEXPECTED RECEIVE QUEUE” mean?
By setting MPICH_PTL_SEND_CREDITS=-1 A flow control mechanism can be enabled. See the mpi_intro man page for details. For best performance, the number of event queue entries for the MPI unexpected receive queue should be set as high as possible. MPICH_PTL_UNEX_EVENTS=80000 Note that this fix does not address unexpected message buffer exhaustion. Thus, the user may still need to adjust MPICH_MAX_SHORT_MSG_SIZE or MPICH_UNEX_BUFFER_SIZE if this buffering overflows.
