Hi Reto, Sorry to have taken so long to respond to your question. > I have been using NetCDF-4 Parallel I/O with the Fortran 90 interface for > some time with success. Thank you for this great tool! > > However, I now have an issue with independent access: > > - NetCDF F90 Parallel access (NetCDF-4, MPIIO) > - 3 fixed and 1 unlimited dimension > - alle processes open/close the file and write metadata > - only a few processes write to the file (-> independent access) > - the write hangs. It works fine if all processes take place. > > I've changed your example F90 parallel I/O file simple_xy_par_wr.f90 to > include a unlimited dimension and independent access of only a subset of > processes. Same issue. Even if I explicitly set the access type to > independent for the variable. Can you reproduce the issue on your side? > > The following system configuration on my side: > - NetCDF 22.214.171.124 and F90 interface 4.2 > - hdf5 1.8.9 > - Openmpi 1. > - OSX, gcc 4.6.3 No, I haven't been able to reproduce the issue, but I can't exactly duplicate your configuration easily, and there have been some updates and bug fixes that may have made a difference. First I tried this configuration, which worked fine on your attached example: - NetCDF 4.3.0-rc4 and F90 interface 4.2 - hdf5 1.8.11 (release candidate from svn repository) - mpich2-1.3.1 - Linux Fedora, mpicc, mpif90 wrapping gcc, gfortran 4.5.1 So if you can build those versions, it should work for you. I'm not sure whether the fix is in netCDF-4.3.0 or in hdf5-1.8.11, but both have a fix for at least one parallel I/O hanging process issue: https://bugtracking.unidata.ucar.edu/browse/NCF-214 (fix in netCDF-4.3.0) https://bugtracking.unidata.ucar.edu/browse/NCF-240 (fix in HDF5-1.8.11) --Russ Russ Rew UCAR Unidata Program address@hidden http://www.unidata.ucar.edu Ticket Details =================== Ticket ID: TIR-820282 Department: Support netCDF Priority: High Status: Closed
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