Say, I run a parallel program using MPI. Execution command
mpirun -n 8 -npernode 2 <prg>
launches 8 processes in total. That is 2 processes per node and 4
nodes in total. (OpenMPI 1.5). Where a node comprises 1 CPU (dual
core) and network interconnect between nodes is InfiniBand.
Now, the rank number (or process number) can be determined with
This returns a number between 0 and 7.
But, How can I determine the node number (in this case a number
between 0 and 3) and the process number within a node (number between
0 and 1)?
You can find this question on stackoverflow (if you prefer to answer
through their interface):