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decomposePar number of processors issue

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Old   February 27, 2017, 19:14
Default decomposePar number of processors issue
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Ewan
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Hi all,

I have got my simulation running fine using the 16 processors that the solver I am using was initially writing for. However, I am trying to update the solver to use 32 processors. So far I have changed the Allrun, run_mpi and decomposeparDict files to include the new figure of 32 but when I try to run a simulation that was working, I now get the error file attached below! I have looked all through my directory for things to change but feel I have done everything.

The solver uses the scotch decompose method just for convenience so I don't think I need to touch that at all. If someone might be able to throw me over some suggestions it'd be much appreciated!
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File Type: png Decompose2.PNG (14.6 KB, 16 views)
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Old   March 1, 2017, 09:47
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Joachim Herb
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Did you run decomposePar (after you changed the settings in decomposeParDict)?
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Old   March 1, 2017, 10:28
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Ewan
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Hi jherb,

Yes I did. It seems to be functioning some of the times but not others! Regardless though, they all the simulations I run seem to start at the last time step of my previous simulation (40285 rather than 0) even when I have removed the postProcessing folder and all other files relating to the previous runs! My controlDict is set to run from firstTime etc. Very confusing.
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Old   March 2, 2017, 18:19
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Joachim Herb
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This is a complete shot in the dark, but: Have you checked that all your cluster node (I assume you use a cluster if you use 32 processes) see the same file system and it is working correctly? Can you log into the nodes with ssh and check this?
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