Hi Christian,
I would suggest using mvapich2 instead. It is supposedly faster than OpenMpi on
infiniband and it seems to have fewer options under the hood which means less
things you have to tweak to get it working for you.
Regards,
Emyr James
Head of Scientific IT
CRG -Centre for Genomic Regulation
C/ Dr. Aiguader, 88
Edif. PRBB
08003 Barcelona, Spain
Phone Ext: #1098
________________________________
From: users <users-boun...@lists.open-mpi.org> on behalf of Christian Von
Kutzleben via users <users@lists.open-mpi.org>
Sent: 02 October 2019 16:14:24
To: users@lists.open-mpi.org
Cc: Christian Von Kutzleben
Subject: [OMPI users] problem with cancelling Send-Request
Hi,
I’m currently evaluating to use openmpi (4.0.1) in our application.
We are using a construct like this for some cleanup functionality, to cancel
some Send requests:
if (*req != MPI_REQUEST_NULL) {
MPI_Cancel(req);
MPI_Wait(req, MPI_STATUS_IGNORE);
assert(*req == MPI_REQUEST_NULL);
}
However the MPI_Wait hangs indefinitely and I’ve debugged into it and I came
across this in pml_ob1_sendreq.c, eventually invoked from MPI_Cancel in my
scenario:
static int mca_pml_ob1_send_request_cancel(struct ompi_request_t* request, int
complete)
{
/* we dont cancel send requests by now */
return OMPI_SUCCESS;
}
The man page for MPI_Cancel does not mention that cancelling Send requests does
not work, so I’m wondering,
whether this is a current limitation or are we not supposed to end up in this
specific …_request_cancel implementation?
Thank you in advance!
Christian
