Error collecting data using mpiexec

[dokken]

This question is not related to FEniCS (as illustrated by the code example). This relates to how to use an MPI communicator to decide which process should write to file. See for instance

https://mpi4py.readthedocs.io/en/stable/tutorial.html
or

How to output the results in each iteration in parallel computation?

Hi all, in order to observe the progress of the running code, I want to output the computational results from FEniCS/FEniCSX in each iteration. And here is a minimal example: from mpi4py import MPI import time Iter = 0 while Iter < 3: Iter += 1 if MPI.COMM_WORLD.rank == 0: print('Iter=%d: some results obtained in FEniCS/FEniCSX' %Iter) else: pass time.sleep(1) When we run the code in serial, it can give us the result in each iteration immediately: Iter 1: Ite…