add a comment on how to disable OMPiO on openmpi

idefix-code · Mar 7, 2024 · f491dce · f491dce
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commit f491dce
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diff --git a/doc/source/faq.rst b/doc/source/faq.rst
@@ -57,6 +57,9 @@ How can I stop the code without loosing the current calculation?
 I'm doing performance measures. How do I disable all outputs in *Idefix*?
   Add ``-nowrite`` when you call *Idefix* executable.
 
+I sometimes get incoherent values in my VTK files when running Idefix with OpenMPI>4, but the code seems to be running fine.
+  This is probably a bug ot the MPI library for some of the MPI I/O calls used by the VTK class. We recommend passing ``--mca io ^ompio`` to mpirun to avoid 
+  this problem which seems to be a bug of the OMPIO layer of OpenMPI.
 
 Developement
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