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Subject: Re: [OMPI users] Number of processes and spawn
From: Ralph Castain (rhc_at_[hidden])
Date: 2010-02-27 02:50:04


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 Golfrè 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_at_[hidden]>
> 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 Golfrè Andreasi <federico.golfre_at_[hidden]>
> 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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