Yes, that does now give the expected behaviour from both Fortran and C both for the test codes and for my real code.
Chris > On 6 Nov 2017, at 14:40, Gilles Gouaillardet <gilles.gouaillar...@gmail.com> > wrote: > > Chris, > > Can you try to > > mpirun --mca io romio314 ... > > And see if it helps ? > > Cheers, > > Gilles > > Christopher Brady <c.s.br...@warwick.ac.uk> wrote: >> I have been working with a Fortran code that has to write a large array to >> disk excluding an outer strip of guard cells using MPI-IO. This uses two MPI >> types, one representing an array the size of the main array without its >> guard cells that is passed to MPI_File_set_view as the filetype, and another >> that represents the subsection of the main array not including the guard >> cells that is used as the datatype in MPI_File_write (same result with >> MPI_File_write_all). Both subarrays are created using >> MPI_Type_create_subarray. When the file size (per core) reaches a value of >> 512MB the final output size diverges from the expected one and is always >> smaller than expected. It does not reach a hard bound, but is always smaller >> than expected. I have replicated this behaviour on machines using Open-MPI >> 2.1.2 and 3.0.0, and am attaching a simple test code (in both C and "use >> mpi" Fortran) that replicates the behaviour on a single core (the test codes >> only work on a single core, but I have demonstra > ted the same problem on multiple cores with our main code). While I've > replicated this behaviour on several machines (every machine that I've tried > it on), I'm also attaching the ompi_info output and config.log files for a > machine that demonstrates the problem. >> >> If anyone can tell me if I've made a mistake, if this is a known bug that >> I've missed in the archives (very sorry if so), or even if this is a >> previously unknown bug I'd be very grateful. >> >> Many Thanks >> Chris Brady >> Senior Research Software Engineer >> University of Warwick >> > _______________________________________________ > users mailing list > users@lists.open-mpi.org > https://lists.open-mpi.org/mailman/listinfo/users
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