>> Can PETSc use parallel HDF5? > Yeah, the implementation is in VecView_MPI_HDF5_DA and uses > H5FD_MPIO_COLLECTIVE if supported. Did you build your HDF5 with MPI?
I just --download-hdf5. Do I need to do something else? > > > Regarding VTK: Is it possible that every process dumps his part of the Vec > > in > a separate file and let Paraview combine this. I think Firedrake does it in > this > way. > > This creates a filesystem metadata problem and is not supported by PETSc's > VTK viewers. > ... > Our usual advice is to use HDF5 with > collective IO if running at large scale. I understand. I will stick to HDF5 then. Thank you! Henrik
