I am trying to understand how Fenics works with mpirun. I execute the following in a terminal mpirun -n 2 python3 check.py where the contents of check.py are as follows import dolfin as df comm = df.MPI.comm_world print('comm.size =', comm.size) if comm.rank == 0: for i in range(5): …

Take a look at this thread: [image] MPI in fenics 2019.1.0 docker container Hello Jack, Thanks a lot for your reply! I think it was an issue with the build. I used a fenics 2019.1.0 docker image with SHA256 : f99661bca19762194d64c9fdf7ba341490bed9c6eb508c5ea37fb25febb53…

It works as expected on my personal machine. There is something wrong with your MPI setup.

Thank you very much for confirming. I am running Fenics 2019.1.0 inside docker container. But I made my own docker container based on the original Dockerfile because I needed to install scipy inside it. I will try to use the original docker container and cross-check.

Thank you very much! I pulled the latest stable docker image and now I get the following output comm.size = 2 Rank = 0 i = 0 Rank = 0 i = 1 Rank = 0 i = 2 Rank = 0 i = 3 Rank = 0 i = 4 comm.size = 2 I think this is a more reasonable output.

Why do I get comm.rank == 0 everytime when using mpirun?

kamensky November 4, 2019, 3:08pm 4

Take a look at this thread:

there was a similar issue there.

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Why do I get comm.rank == 0 everytime when using mpirun?

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