I am trying to run an SCF calculation on a small cluster of 3 CPUs with a total of 12 processors. But when I am running my calculation with command mpirun -np 12 ' /home/ufscu/qe-6.5/bin/pw.x ' -in scf.in> scf.out it is taking a longer time then it was taking in a single CPU with 4 processor. So it will be really great if you can guide me on this since I am new in this area. Thank you so much for your time.
From https://github.com/QEF/q-e
It depends on what you compiled and how you are running it.
Have you tried to see whether it scales beyond 3-4 processors on your system? Is the data movement/communication latency high on your system? You can plot a curve to see this by checking completion times with different number of processors.
It's not running on other CPUs.
I think, their are some mistake in the comand.
Thank you @Masab Ahmad
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