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I used MPICH2. When I start my applications by using mpiexec, they run on the remote hosts (Win7) have 25% CPU usage. I want to increase the percentage if this can improve my application performance. I wish that my remote computers are dedicated to my calculations. How can I do?
Thanks
For MPI processes your # of processes should match the sum of the core count of your machines (assuming a CPU-heavy workload). If an MPI process runs with
-np 4on a quad-core box, it will consume all four cores and you’ll see your CPU usage near 100%. If it runs with-np 1the CPU load of the box is going to be around 25% (because only one core out of four is dedicated to your calculations). Any additional increase and they will start to contend for CPU time.