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Old   December 9, 2012, 17:25
Default pyFoamPlotRunner on network
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I have used succesfully pyFoam on a single node multi core hardware.
Recently I extended to a small cluster with 3 nodes (8 cores + 12 cores +12 cores with in total 32 cores)
On this 3 node configuration I`m able to run succesfully a parallel job under mpi. Here is an example how I can succesfully start a parallel pimpleFoam run on all nodes:

mpirun --hostfile hosts -np 32 pimpleFoam - parallel

In order to plot on the fly residuals, I used to apply pyFoam. On one node this is working well. Example for the corresponding job (the first node has 8 cores listed in hosts):

pyFoamPlotter.py --machinefile=hosts --proc=8 --progress pimpleFoam

Unfortunately this is not working if I start it on all 3 nodes:

pyFoamPlotter.py --machinefile=hosts --proc=32 --progress pimpleFoam

The general log file in the ~/.pyfoam/log directory contains the following warning:
WARNING Not deregistering, because it seems we were not registered in the first place - in FoamServer.py:511

What is going wrong? I thouht I have defined all required paths on all nodes ... Any idea?

Thank`s a lot for your support.
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Old   December 11, 2012, 13:39
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Quote:
Originally Posted by PeterX30 View Post
I have used succesfully pyFoam on a single node multi core hardware.
Recently I extended to a small cluster with 3 nodes (8 cores + 12 cores +12 cores with in total 32 cores)
On this 3 node configuration I`m able to run succesfully a parallel job under mpi. Here is an example how I can succesfully start a parallel pimpleFoam run on all nodes:

mpirun --hostfile hosts -np 32 pimpleFoam - parallel

In order to plot on the fly residuals, I used to apply pyFoam. On one node this is working well. Example for the corresponding job (the first node has 8 cores listed in hosts):

pyFoamPlotter.py --machinefile=hosts --proc=8 --progress pimpleFoam

Unfortunately this is not working if I start it on all 3 nodes:

pyFoamPlotter.py --machinefile=hosts --proc=32 --progress pimpleFoam

The general log file in the ~/.pyfoam/log directory contains the following warning:
WARNING Not deregistering, because it seems we were not registered in the first place - in FoamServer.py:511

What is going wrong? I thouht I have defined all required paths on all nodes ... Any idea?

Thank`s a lot for your support.
That log entry ("not deregistering") isn't the problem. It has to do with something completely different (the Meta-Server. See the "Happy Foaming" presentation from Montreal) which you probably are not using.

@pyFoamPlotter.py: you mean pyFoamPlotRunner.py, right?

Anyway: that happens after you start the run on the cluster (as I said: the log-entry is not the problem)?

BTW: Usually if you specify a machinefile then PyFoam should calculate the -np automatically

For calculations on a cluster I usually recommend to write output to a logfile (either with pyFoamRunner.py or a simple redirect) and then using pyFoamPlotWatcher.py on that output. That way the running of the solver is detached from the display
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Old   December 12, 2012, 16:28
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@pyFoamPlotter.py: you mean pyFoamPlotRunner.py, right?

Off course, a typo. I mean pyFoamPlotRunner.py as stated in the title of the thread.

I checked your proposal and this works fine on the fly when I start "pyFoamPlotWatcher.py logfile"
on a second terminal accessing the corresponding logfile. Thank's a lot!!!
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