Hello experts,
I have compiled QE for GPU (MPI + OpenMP). I've that while using more than one core (mpirun -np 8) the calculation becomes very slow but it is way more faster when I do "mpirun -np 1". Is there a reason for that?
I have only 1 GPU and i have added "export OMP_NUM_THREADS=1" in the bashrc
thank you.
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