On Mon, 16 Mar 2020 at 20:26, Zhang, Hong <[email protected]> wrote:

I am a bit confused. Isn’t this required when one uses MPI-IO?

For MPI-IO, of course! Every process must call MPI_File_open(). I'm NOT talking/asking about the MPI-IO path. Our MPI-IO code is just fine, no objections/concerns about it.

But of course, when not using MPI-IO, only process zero should open the file.

That's what I was asking about. So it seems we all are agree about this. I'll go ahead and submit a MR. -- Lisandro Dalcin ============ Research Scientist Extreme Computing Research Center (ECRC) King Abdullah University of Science and Technology (KAUST) http://ecrc.kaust.edu.sa/