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Word_of_caution_MPI_implementation
benmql edited this page Jan 4, 2021
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... is important.
My experience is that 2decomp&fft is sensitive on the MPI implementation on Occigen (a Haswell cluster in the south of France). openmpi works flawlessly. intelmpi generates a disastrous memory leak. mpich was tested with modest resolutions only on my laptop and workstation but worked well.
As I did not have access to many different clusters to try and reproduce the leak, I am unsure of its exact cause.
If you get a chance to test the code on different machines/implementations, feel free to keep me posted on this issue.
Bottom line: use openmpi if you can. Problems may or may not creep up with intelmpi.