[QE-users] problem with parallelization

[Artur Durajski]

Dear All, 
after updating my system to Ubuntu 22.04 I have a problem with parallelization calculations. In particular when I put, for example, command: mpirun -np 4 pw.x -i input.in > output.out 
all my cores (20 cores) are involved in the calculations. 
Is anyone faced with that problem? How to configure openmpi/QE to use only cores that I declared before pw.x command. 
I use OpenMPI installed in the following way: sudo apt-get install openmpi-bin libopenmpi-dev and QE-6.7 (./configure and make all). 
Thank you in advance for your help. 

Best Regards 

Artur 
--- 
Czestochowa University of Technology 

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