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[OpenFOAM.org] OpenFOAM 2.4.0 OpenMPI Epoll warning on parallel job |
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November 15, 2015, 08:56 |
OpenFOAM 2.4.0 OpenMPI Epoll warning on parallel job
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#1 |
New Member
Tom Alderweireldt
Join Date: Jan 2015
Location: Schilde, Belgium
Posts: 16
Rep Power: 11 |
Hi,
I ported my existing OpenFOAM cases from version 2.3.0 to 2.4.0. The 2.4.0 version compiled without issues on a Fedora 23 Linux system. When I start a parallel test case with : >> mpirun -np 8 icoFoam -parallel > log & it starts, but I get the following openmpi related warning: "[WARN] Epoll ADD(4) on fd 1 failed ..." The result is that the log file is not written while the case is running. When the job finishes, the log file appears. I can't find anything wrong with the results, but it is annoying that I can't 'tail' the log file during execution to check progress or errors. Is this a known issue, can anyone suggest a solution ? Tom. |
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November 15, 2015, 09:46 |
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#2 | |
Retired Super Moderator
Bruno Santos
Join Date: Mar 2009
Location: Lisbon, Portugal
Posts: 10,981
Blog Entries: 45
Rep Power: 128 |
Quick answer: From my blog post: Notes about running OpenFOAM in parallel
Quote:
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November 15, 2015, 11:41 |
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#3 |
New Member
Tom Alderweireldt
Join Date: Jan 2015
Location: Schilde, Belgium
Posts: 16
Rep Power: 11 |
the output indeed only comes out at the end of the mpirun.
It is clearly the same issue as mentioned in the other post you mentioned (thanks for that). However I'm unable to find the 'mca-params.conf' file at the location given in this other post. Checking mpirun --version gives me 1.8.8 I don't find any /usr/mpi/gcc/openmpi-1.8.8 directory. A full search gives me 2 locations with a mca-params.conf file - one in /etc/openmpi-x86_64 - one in /home/myuser/OpenFOAM/Thirdparty-2.4.0/..openmpi-1.8.5/... unfortunately both are fully commented out, so I don't see what I could change to disable this epoll function. |
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November 15, 2015, 13:24 |
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#4 |
Retired Super Moderator
Bruno Santos
Join Date: Mar 2009
Location: Lisbon, Portugal
Posts: 10,981
Blog Entries: 45
Rep Power: 128 |
Quick answer: When in doubt, ask Open-MPI:
Code:
ompi_info -a -c > log.ompi_info
Code:
mpirun --mca opal_event_include poll ... |
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