Re: OpenMPI is flaky

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On 11/15/19 3:07 PM, Christoph Junghans wrote:
Hi,

I was trying to bump the espresso package to v4.1.1 and came across
multiple issues in the %check phase of the builds on Rawhide, F31 and
EPEL8.

On Rawhide and F31, some tests seem to receive an error in the MPI_INIT phase.
Error:
*** An error occurred in MPI_Init
*** on a NULL communicator
This happened with OpenMPI, but not MPICH.
I was able to workaround these failures by retriggering the builds a
couple of times, which isn't a great solution.

Upstream issues on that topic:
Rawhide: https://github.com/espressomd/espresso/issues/3306
F31: https://github.com/espressomd/espresso/issues/3305

I would suggest bringing this up with the openmpi folks. They are very helpful.

On EPEL8 however, things are much worse - multiple tests fail on each
arch in MPI_INIT incl. a couple of segfaults:
https://github.com/espressomd/espresso/issues/3307
I wasn't able to reproduce these issues in a CentOs8 container in docker.

I commented in the issue as well, but there are issues with UCX and openmpi in RHEL8.1.


--
Orion Poplawski
Manager of NWRA Technical Systems          720-772-5637
NWRA, Boulder/CoRA Office             FAX: 303-415-9702
3380 Mitchell Lane                       orion@xxxxxxxx
Boulder, CO 80301                 https://www.nwra.com/

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