[mpich-discuss] Hydra: Sorting node list by number of CPUs

[Yauheni Zelenko]

Hi!

I think will be good idea to have command line option which will force Hydra to sort node list by number of CPUs before proxies creation.

Our application is working in master-slaves mode and master is always have rank 0. From performance point of view it's good idea to put as much slaves as possible to same host to use shared memory.

However managed environment like LSF could distribute CPUs across hosts randomly. For example we had 1 CPU in host1 and seven on host2.

So sorting node list should help. I think it may be implemented with qsort().

Eugene.