[Wrf-users] wrfv3 & mpi

[Cesar Hernandez Baño]

Hi

I'm using wrfv3 , with mpich 1.2.7p1. The problem is when I use more  
cpus/nodes in the cluster, the more slower runs the test.

I have 4 pcs, Pentium 4 , four cpu each server. I run  
test/em_real/wrf.exe with mpirun

Network cards are Gigabit; using 2 processes network traffic flows at  
70 MBits aprox. Using 12 processes uses 150 MBit.
When I use 2 processes, each CPU uses 80-90% aprox. Using 3 processes,  
each CPU uses 50-60%.

What's the problem?

Cheers

-- 
Cesar