Since another user was doing something that caused a similar problem, perhaps we are missing a key piece of info here. Are you launching one app_context across 128 nodes? Or are you launching 128 app_contexts, each on a separate node?


On Feb 26, 2010, at 10:23 AM, Federico Golfrč Andreasi wrote:

I'm doing some tests and it seems that is not able to do a spawn multiple with more than 128 nodes.

It just hold, with no error message.

What do you think? What can I try to understand the problem.

Thanks,

Federico




2010/2/26 Ralph Castain <rhc@open-mpi.org>
No known limitations of which we are aware...the variables are all set to int32_t, so INT32_MAX would be the only limit I can imagine. In which case, you'll run out of memory long before you hit it.


2010/2/26 Federico Golfrč Andreasi <federico.golfre@gmail.com>
HI !

have you ever did some analysis to understand if there is a limitation in the number of nodes usable with OpenMPI-v1.4 ?
Using also the functions MPI_Comm_spawn o MPI_Comm_spawn_multiple.

Thanks,
   Federico

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