shmem: mmap: shared memory error on Mac OS

[Nik Markus Leuenberger]

Dear all,

Thanks to your help earlier, I was able to compile my program on the Mac ARM-machine using clang. However, when I execute the program from the command line using ./program, I get the following kind of strange error: 

[] shmem: mmap: an error occurred while determining whether or not /tmp/ompi.***.0/jf.0/3759407104/sm_segment.***.0.e0140000.0 could be created.

after that the program seems to continue normally. 

What is also strange is that I don't get any warning/error, when I use 

mpirun -n 1 ./program

The reason why I would like to get this fixed is because when I execute ctest for tests that are not configured to run with mpirun, I see the message as well in the test log and even if the test might still pass and run correctly, I feel like it would be nice to not have the error message.

Thank you very much in advance if you have experienced anything similar and found a solution how to get rid of it.

Best regards,

Nik

[Bruno Turcksin]

Hello Nik,

This looks like an OpenMPI issue. I have you tried the suggestions from https://github.com/open-mpi/ompi/issues/12784

Best,

Bruno

[Nik Markus Leuenberger]

Dear Bruno,

Thank you very much for your reply and apologies for my late reply. I think that was exactly the issue.

After upgrading to open-mpi 5.0.7, the problem seems to be gone.

Thanks again and best regards,

Nik

[Bruno Turcksin]

I am glad it's fixed!

Best,

Bruno

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