I tried to run my fenics code in both serial and parallel in the HPC cluster. First I ran the code in serial in the HPC cluster and then I plotted the vtu file using paraview software. In this case I am getting a good plot. But when I run the same code using “mpirun -n 2 python3 script.py” , and p…

How did you get vtu file ? If you’re using old dolfin, you should use XDMF format that supports MPI. XDMF can be viewed with Paraview.

I would suggest adding your minimal example here, so that people could reproduce the error themself. Please add it with the following encapsulation ```python # add code here ```

import random from IPython.display import HTML, display from fenics import * from matplotlib import pyplot from mpi4py import MPI ####code#### Initialize MPI comm = MPI.COMM_WORLD rank = comm.Get_rank() Define progress function for display def progress(value, max=100): return HTML(“”" Iter…

No, I am using latest version of dolfin.

Please format your code as I described above. [image] dokken: ```python # add code here ```

There is newer version of dolfin called dolfinx and I just wanted to ask if you’re using dolfin or dolfinx. Anyway, you are using File, but you should use XDMDFile class. https://fenicsproject.org/olddocs/dolfin/2017.2.0/python/programmers-reference/cpp/io/XDMFFile.html

Thank you very much. I have installed dolfin version 2019.2.0.dev0. Please share me a sample file which contains XDMDFile class.

To add the answer above, you need to pass MPI.comm_world to run parallel. So, it would be something like outfile = XDMFFile(MPI.comm_world, “some_name”) outfile.write(u, t)

How to plot solutions while running fenics code in parallel?

General

dokken November 13, 2023, 6:19pm 9

See for instance: Update node coordinates in paraview - #5 by dokken

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How to plot solutions while running fenics code in parallel?

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