Hi all,
In another message, Jaroslav made the comment
1. info is the first output argument in all functions. I think it should be
> the second one, so that it can be easily ignored if wanted.
> In particular, the check in examples
>
> if not(MPI_Initialized)
> info = MPI_Init();
> end
>
> makes no sense (unless I'm missing something) because it's the info output
> from MPI_Initialized that is tested and that is always zero.
>
This follows the MPI standard, which says:
> All MPI routines (except
> MPI_Wtime<http://www.mpi-forum.org/docs/mpi-11-html/node150.html#node150>and
> MPI_Wtick <http://www.mpi-forum.org/docs/mpi-11-html/node150.html#node150>)
> return an error value; C routines as the value of the function and Fortran
> routines in the last argument. Before the value is returned, the current MPI
> error handler is called. By default, this error handler aborts the MPI job.
> The error handler may be changed with
> MPI_Errhandler_set<http://www.mpi-forum.org/docs/mpi-11-html/node148.html#node148>;
> the predefined error handler MPI_ERRORS_RETURN may be used to cause error
> values to be returned. Note that MPI does *not* guarentee that an MPI
> program can continue past an error.
>
> *MPI_SUCCESS * No error; MPI routine completed successfully.
Following the standard is a big plus, in my opinion. That way, knowledge
about MPI previously gained from C or Fortran will be useful when using MPI
with Octave. MPITB work this way, too. I have yet to try it, but I believe
that I could use Riccardo's stuff as a drop-in replacement for functions
from MPITB. Both packages respect the standard. This level of compatibility
should help to make both Riccardo's stuff and MPITB stronger, and will favor
its use for large scale research.
Michael
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