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Effective usage of parallelism requires some basic knowledge on how
parallel machines work and how parallelism is implemented in
QUANTUM ESPRESSO. If you have no experience and no clear ideas (or not
idea at all), consider reading the section of the User Guide
explaining some basic parallelism for QUANTUM ESPRESSO.
'''A:''' A frequent reason for lousy parallel performances is a
conflict between MPI parallelization (implemented in QUANTUM ESPRESSO)
and the autoparallelizing feature of MKL libraries. Set the
environment variable OPEN_MP_THREADS to 1. See the section
dedicated to this problem in the User Guide.
Paolo Giannozzi
2010-04-08