<html><body><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt; color: #000000"><div>Dear All,</div><div><div>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</div><div>all my cores (20 cores) are involved in the calculations. </div><div>Is anyone faced with that problem? How to configure openmpi/QE to use only cores that I declared before pw.x command.</div><div>I use OpenMPI installed in the following way: sudo apt-get install openmpi-bin libopenmpi-dev and QE-6.7 (./configure and make all).</div><div>Thank you in advance for your help.</div><div><br></div><div>Best Regards</div></div><div><br></div><div data-marker="__SIG_PRE__">Artur<br>---<br>Czestochowa University of Technology<br><br></div></div></body></html>