[mpich-discuss] mpiexec and -n option

[Pavan Balaji]

On 08/15/2011 02:46 PM, Jain, Rohit wrote:
> How is default value determined?
> I am running my application in 2 different environment: shell and grid.
> It is working fine in shell, but taking default value of 4 in grid.

Someone is passing a list of hosts to Hydra. It is either you directly 
(though the HYDRA_HOST_FILE environment) or you are running it under a 
resource manager which Hydra detected and is querying it for the 
allocated resources.

-- 
Pavan Balaji
http://www.mcs.anl.gov/~balaji