Sebastian,
thanks for the info.
bottom line, the global lock is in the OpenMPI glue for ROMIO.
i will check what kind of locking (if any) is done in mpich
Cheers,
Gilles
On 3/24/2016 11:30 PM, Sebastian Rettenberger wrote:
Hi,
I tested this on my desktop machine. Thus, one node, two tasks.
It deadlock appears on the local file system and on the nfs mount.
The MPICH version I tested was 3.2.
However, as far as I know, locking is part of the MPI library and not
ROMIO.
Best regards,
Sebastian
On 03/24/2016 03:19 PM, Gilles Gouaillardet wrote:
Sebastian,
in openmpi 1.10, the default io component is romio from mpich 3.0.4.
how many tasks, how many nodes and which file system are you running
on ?
Cheers,
Gilles
On Thursday, March 24, 2016, Sebastian Rettenberger <rette...@in.tum.de>
wrote:
Hi,
I tried to run the attached program with OpenMPI. It works well with
MPICH
and Intel MPI but I get a deadlock when using OpenMPI.
I am using OpenMPI 1.10.0 with support for MPI_THREAD_MULTIPLE.
It seems like ROMIO uses global locks in OpenMPI which is a problem if
multiple threads want to do collective I/O.
Any idea how one can get around this issue?
Best regards,
Sebastian
--
Sebastian Rettenberger, M.Sc.
Technische Universität München
Department of Informatics
Chair of Scientific Computing
Boltzmannstrasse 3, 85748 Garching, Germany
http://www5.in.tum.de/
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