BTW: I did see one issue in your program. In the program that isn't working, you declare the various input arrays for MPI_Comm_spawn_multiple, but only the manager rank=0 ever initializes them. Thus, the other manager ranks were passing random garbage down to the function.

Even though only the root process looks at those params, it still shouldn't be random garbage just from a programming standpoint. At the least, set them to NULL or something.



On Tue, Aug 18, 2009 at 8:34 AM, Ralph Castain <rhc@open-mpi.org> wrote:
By any chance did you have the flag on to check MPI parameters? I think we have a bug in there that might be causing what you saw, but it would only be active if you had requested that OMPI check parameters.


Thanks
Ralph


2009/8/18 Federico Golfrč Andreasi <federico.golfre@gmail.com>
That's is you've done: the worker program spawned and the two versions of the manager that call the spawning.
I you find something wrong please let me know.

Thank you,
   Federico



2009/8/18 Ralph Castain <rhc@open-mpi.org>

????

Only the root process needs to provide the info keys for spawning anything. If that isn't correct, then we have a bug.

Could you send us a code snippet that shows what you were doing?

Thanks
Ralph


2009/8/18 Federico Golfrč Andreasi <federico.golfre@gmail.com>

I think I've solved my problem:

in the previous code the arguments of the MPI_Comm_spawn_multiple where filled only by the "root" process not by all the process in the group. Now all the ranks have all that information and the spawn is done correctly.
But I read on http://www.mpi-forum.org/docs/mpi21-report/node203.htm that those information are significant only at root.
In any case now it works.

Thanks,
Federico



2009/8/18 Jeff Squyres <jsquyres@cisco.com>
On Aug 18, 2009, at 5:12 AM, Federico Golfrč Andreasi wrote:

In the info object I only set the "host" key (after creatig the object with the MPI_Info_create).

I've modified my code to leave out that request and created the array of Info object as an array of MPI_INFO_NULL but the problem is still the same.
The error is thrown only when running with more than one process.

Do I send you a short program for testing it?


If you have a short program that can replicate the problem, yes, that would be great.

--
Jeff Squyres
jsquyres@cisco.com


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