Afraid not. You could start a single process, and then have that process call 
MPI_Comm_spawn to launch the rest of them

On Jun 6, 2013, at 7:54 AM, José Luis García Pallero <jgpall...@gmail.com> 
wrote:

> Hello:
> 
> I'm newbie in the use of MPI, so probably I ask some stupid question (or 
> previously asked, but in this case I have searched in the archive and I 
> haven't found anything):
> 
> Exists any other way than -np X in order to pass the number of processes to 
> start for an MPI program? I mean a function of the style 
> MPI_Set_Number_Processes() or similar
> 
> Thanks
> 
> -- 
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> José Luis García Pallero
> jgpall...@gmail.com
> (o<
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