Hello! I am having problem using MPI_Comm_spawn under torque. It doesn't work when spawning more than 12 processes on various nodes. To be more precise, "sometimes" it works, and "sometimes" it doesn't!
Here is my case. I obtain 5 nodes, 3 cores per node and my $PBS_NODEFILE looks like below. node1 node1 node1 node2 node2 node2 node3 node3 node3 node4 node4 node4 node5 node5 node5 I started a hello program (which just spawns itself and of course, the children don't spawn), with mpiexec -np 3 ./hello Spawning 3 more processes (on node 2) - works! spawning 6 more processes (node 2 and 3) - works! spawning 9 processes (node 2,3,4) - "sometimes" OK, "sometimes" not! spawning 12 processes (node 2,3,4,5) - "mostly" not! I ideally want to spawn about 32 processes with large number of nodes, but this is at the moment impossible. I have attached my hello program to this email. I will be happy to provide any more info or verbose outputs if you could please tell me what exactly you would like to see. Best, Suraj
hello.c
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