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Old   November 16, 2014, 08:57
Default Verify icoFoam result
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Christian
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Hey there,

I am playing around with docker and thought about conducting a little study about OpenFOAM in a containerized environment.
I conducted a study on MPI workloads with docker in general using HPCG:
http://qnib.org/qnibterminal/2014/11...MPI-workloads/

The goal is to show how OpenFOAM performs using different operating systems and (maybe more importantly) how to rerun an input deck which provides the same outcome.

Now I wonder how this 'equal outcome' thing can be defined. Would it be accurate to simply check the md5sum of some
of the result files?

Code:
job_results/openfoam/openfoam/13/omp-sys/2014-11-16_13-29-00/slurm-708.out:U_MD5=22d7cb33d17f8a604c83a0411232d16e  ./0.005/U
job_results/openfoam/openfoam/13/omp-sys/2014-11-16_13-29-03/slurm-709.out:U_MD5=22d7cb33d17f8a604c83a0411232d16e  ./0.005/U
job_results/openfoam/openfoam/13/omp-sys/2014-11-16_13-29-05/slurm-710.out:U_MD5=22d7cb33d17f8a604c83a0411232d16e  ./0.005/U
job_results/openfoam/openfoam/13/omp-sys/2014-11-16_13-29-08/slurm-711.out:U_MD5=22d7cb33d17f8a604c83a0411232d16e  ./0.005/U
Furthermore, what should I expect in terms of reproducibility of results?

As far as I understood so far I can not expect to get the same result if I change the decomposition?
'n = ( 16 1 1)' is going to be different from 'n = ( 8 2 1)' no matter what?

I use the cavityFine test case found here:
Parallel processing of OpenFOAM cases on multicore processor???

If someone suggest a better testcase that scales up to 64 cores, I am all open.

Kind regards
Christian
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Old   November 16, 2014, 09:16
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Christian
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The previously shown results were run on 2 nodes, each with 2 sockets with a QUAD-core XEON.


Running on four nodes I got the same checksum (only using 4 tasks/node):

Code:
U_MD5=22d7cb33d17f8a604c83a0411232d16e  ./0.005/U
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Old   December 7, 2014, 14:45
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Christian
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No one has an opinion about how to verify if two results are identical?
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