On Apr 8, 2013, at 4:47 AM CDT, Mahesh Doijade <[email protected]> wrote:

Is there any upper limit for command line arguments passed to MPI_Comm_Spawn_Multiple.

There is no intentional, specific upper limit, though there will probably be two limits in practice: * an OS limit on number of arguments and/or total size (in bytes) of arguments: http://www.in-ulm.de/~mascheck/various/argmax/ * some limitations in our internal PMI protocols, which hopefully are at least being error checked right now The first limit will probably result in an understandable error message. I have no idea what will happen if you hit the second limit. -Dave