Regarding UNIVERSE_SIZE

[Prakash Velayutham]

Hi,

How is the implementation of UNIVERSE_SIZE in mpich2? Does anyone know. 
I would like to know if it can be varied during a MPI run by the 
scheduler? I am looking at it from MPI_Comm_spawn point of view. If I 
can modify this variable from the scheduler's end when more processors 
are available and check for this variable from inside the application, 
then I can effectively use the spawn to get newer nodes from inside of 
scheduler environment. I understand it is not that straight forward, but 
it is hackable, right?

Any words from developers, please?

Regards,
Prakash