[Beowulf] MPI_Isend/Irecv failure for IB and large message sizes

Martin Siegert siegert at sfu.ca
Mon Nov 16 16:01:02 EST 2009


On Sun, Nov 15, 2009 at 02:29:13PM -0800, Michael Di Domenico wrote:
> you might want to ask on the linux-rdma list (was openfabrics).  its
> been awhile since i looked at IB error messages, but what
> stack/version are you running?

This is under Scientific Linux 5.3 which is a RH 5.3 clone that comes
with OFED-1.3.2, which admittedly is quite old. Unfortunately,
upgrading this is a major forklift ... thus I must be sure that this is
really the problem. I'll do a few tests on a couple of nodes ...

Thanks!

- Martin

> On Sat, Nov 14, 2009 at 4:43 PM, Martin Siegert <siegert at sfu.ca> wrote:
> > Hi,
> >
> > I am running into problems when sending large messages (about
> > 180000000 doubles) over IB. A fairly trivial example program is attached.
> >
> > # mpicc -g sendrecv.c
> > # mpiexec -machinefile m2 -n 2 ./a.out
> > id=1: calling irecv ...
> > id=0: calling isend ...
> > [[60322,1],1][btl_openib_component.c:2951:handle_wc] from b1 to: b2 error polling LP CQ with status LOCAL LENGTH ERROR status number 1 for wr_id 199132400 opcode 549755813  vendor error 105 qp_idx 3
> >
> > This is with OpenMPI-1.3.3.
> > Does anybody know a solution to this problem?
> >
> > If I use MPI_Allreduce instead of MPI_Isend/Irecv, the program just hangs
> > and never returns.
> > I asked on the openmpi users list but got no response ...
> >
> > Cheers,
> > Martin
> >
> > --
> > Martin Siegert
> > Head, Research Computing
> > WestGrid Site Lead
> > IT Services                                phone: 778 782-4691
> > Simon Fraser University                    fax:   778 782-4242
> > Burnaby, British Columbia                  email: siegert at sfu.ca
> > Canada  V5A 1S6
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