[petsc-users] Argument out of range error only in certain mpi sizes

Smith, Barry F. bsmith at mcs.anl.gov
Thu Apr 11 11:31:13 CDT 2019

  There is a rather detailed routine for computing the HDF5 chunk size that PETSc uses for its parallel IO in VecGetHDF5ChunkSize() which is called from VecView_MPI_HDF5_DA(). (Note the this attempts to optimize it for the parallel IO that PETSc is doing). I don't understand HDF5 chunk sizes so don't know the relationship between a chunk size used for writing to a HDF5 file and reading from it.


> On Apr 11, 2019, at 10:39 AM, Sajid Ali <sajidsyed2021 at u.northwestern.edu> wrote:
> One last question I have is : Does PETSc automatically chose a good chunk size for the size of the vector it has and use it to write the dataset ? Or is this something I shouldn't really worry about (not that it affects me now but it would be good to not have a slow read from a python script for post-processing).

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