On Apr 20, 2005, at 12:31 PM, Scott Neugroschl wrote:
In both cases, it seems to me to be a case of information overload. For
someone running their first MPI program, there's so much there that it's a
bit confusing. I've had about 20 years experience deciphering *nix man
pages, and while all the info was there, it was difficult to find the
relevant info.
Good point. We can add a short section in the top of the man page (v7.1.2 is "immanent"... and has been for a while... ;-), but I can ensure it gets in that version).
On a re-read, now that I know what I'm looking for, I was able to find the
info in the man page. Perhaps an "EXAMPLES" section... I know that I
wouldn't really have looked under "Location Nomenclature" for an example of how to run an MPI program.
Gotcha.
The mpirun -h, again, on re-reading, is clear. I guess part of my problem
is the horrendous error message.
That one is unfortunately difficult to fix. Long, boring story. :-\
Perhaps a reasonable default (such as C) might solve some issues.
We've had arguments about this over the years and decided against it, mainly because of hysterical raisins -- those experienced with MPI and/or LAM/MPI won't expect it. Additionally, with the MPMD syntax in mpiexec (which, in Open MPI -- our next-generation MPI that we're currently working on; LAM/MPI is in maintenance mode -- is the same thing as mpirun), and because no pre-existing universe is required (a la LAM/MPI), it becomes far less clear how many processes the user intended to run.
Make sense?
--
{+} Jeff Squyres
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