Saving meshes in a list: RuntimeError: *** Error: Duplication of MPI communicator failed

[dokken]

@chenyongxin

I think I met a similar situation, where my code terminates at around 1,900 steps with the following error output. If I save checkpoint at 1,000 step and restart from that point, the simulation can pass it. I have no direction why it happens. From the error output, if it can be deduced to the MPI duplication problem? In my code, I did not have an explcit call of generating new mesh in every time step.

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Generating a mesh at each time step might be problematic, as MPI only allows for a limited number of duplicate-calls within each simulation.

Without the actual code you are running, it is hard to give any guidance on how to avoid it.