We have following configuration:
4 nodes with 2x4 cores processor on each which means that we are running on 4 x 8 processors and all machines are connected using 1gbit LAN.
Debian linux 4.0 installed
We are running weather forecast model compiled with pgi/mpich and we have performances problem when we run it on all 4 nodes.Usage per all cores is about 30-40 % and it should be over 90%.
It even works faster if we run it using mpirun on one machine than on 4.
what could be the problem ?
Do we try to install 10gb network for this model ?