Dear all,
I am trying to incorporate support for parallel I/O in my HPX program. I
make use of HDF5, which in turn uses MPI I/O for parallel I/O. To use
HDF5 for parallel I/O, one thing I need to do is to pass the MPI
communicator. I have trouble obtaining this communicator.
I found hpx::util::mpi_environment::communicator(), which seems exactly
what I need, but asserting hpx::util::mpi_environment::enabled() fails.
It seems MPI is not initialized (yet?).
The command line looks like this:
srun \
--ntasks $nr_tasks \
--cpus-per-task=$nr_cpus_per_task \
--cores-per-socket=$nr_cores_per_socket \
--kill-on-bad-exit \
$my_command $my_arguments \
--hpx:ini="hpx.parcel.mpi.enable=1" \
--hpx:ini="hpx.os_threads=$nr_cores_per_socket" \
--hpx:bind=$cpu_binding
My questions are:
- Can I assume that MPI is initialized after the HPX runtime is?
- How can I obtain the MPI communicator HPX uses? Or should I maybe
manage a communicator specifically for I/O myself?
Thanks for any info / hints / remarks / examples!
Kor
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