On 26/04/2024 23:00, Bhargab Kakati wrote:
while using more
than one core (mpirun -np 8) the calculation becomes very slow but it is
way faster when I do "mpirun -np 1". Is there a reason for that?
of course there is a reason, and you mention it in the following line:
I have only 1 GPU
You should run one MPI process per GPU. If you have 1 GPU, you don't
even need MPI. You may find OpenMP useful if you have available CPU
cores, but don't expect any serious speedup from OpenMP
Paolo
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