"Buesing, Henrik" <[email protected]> writes: >>> 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?
That should configure it with whichever MPI PETSc is using. How are you concluding that it's only using rank 0?
