[QE-users] Does QE contain any OpenMP optimization ?

[Husak Michal]

I apology for my ignorance ...

I was using a Windows search based on following sequence:

findstr /S /M "$OMP" *.*

witch probably does not do the correct job (finding only 5 occurrence) ...

grep -R '!$omp' .  finally show me (as well as your sequence) the OpenMP optimization
in the code is massive ....

Homework for me - to find why OpenMP optimized build running on 4 CPU gives 100% identical
performance as serial builds running on 1 core.  The run of OpenMP build on 1 core is visible in task manager as well ...

Maybe my gfortran is mad :-).

Thank you for your patience ....

Michal Husak
________________________________
From: users <users-bounces at lists.quantum-espresso.org> on behalf of Paolo Giannozzi <p.giannozzi at gmail.com>
Sent: Sunday, January 30, 2022 5:52 PM
To: Quantum ESPRESSO users Forum
Subject: Re: [QE-users] Does QE contain any OpenMP optimization ?

On Sat, Jan 29, 2022 at 10:16 PM Husak Michal <Michal.Husak at vscht.cz<mailto:Michal.Husak at vscht.cz>> wrote:
I was searching for OpenMP optimization flags in QE fortran code like

!$OMP PARALLEL etc ...

But I did not find any in important source codes ...

$ grep -i \$omp */*f90 */*/*f90| wc -l
1299

I guess that there are at least a few of the 1299 occurrences that have some effect. This is for the development version but it seems to me unlikely that all of them have appeared in the last two months

Paolo
--
Paolo Giannozzi, Dip. Scienze Matematiche Informatiche e Fisiche,
Univ. Udine, via delle Scienze 206, 33100 Udine, Italy
Phone +39-0432-558216, fax +39-0432-558222