I looked into the IO issue, one hint is found with
export OMPI_MCA_io_base_verbose=40
mpirun -np 1 -H localhost:1 ./mpitest
...
mca: base: components_open: found loaded component ompio
mca: base: components_open: component ompio open function successful
mca: base: components_open: found loaded component romio321
mca: base: components_open: component romio321 open function successful
...
So in fact there are two IO components available: ompio and romio321.
The
first is selected (and fails). If you select the second, mpitest works:
$ mpirun -np 1 -H localhost:1 --mca io romio321 ./mpitest
This is process 1 / 1
You can make this permanent with
export OMPI_MCA_io=romio321
added to your login scripts.
HTH. (OpenMPI is too complicated for it's own good.)
John
On 2021-02-03 09:51, j...@bitminer.ca wrote:
Hi Martin,
I haven't run into your MPI_File_open issue (don't use it), but
your code does fail for me too in the same way.
$> mpirun -np 1 -H localhost:1 ./fmpitest
fmpitest:/usr/local/lib/libmpi.so.5.0: ./fmpitest : WARNING:
symbol(mpi_fortran_statuses_ignore_) size mismatch,
relink your program
fmpitest:/usr/local/lib/libmpi.so.5.0: ./fmpitest : WARNING:
symbol(mpi_fortran_status_ignore_) size mismatch,
relink your program
The Fortran symbol error you see is common and I'm not sure of the
cause. I did look into it at one point and decided all definitions
were
in fact identical, so it might be a weird compiler+linker issue.
It's never been symptomatic beyond the warning so I ignore it.
--John
