<div dir="ltr">While compiling with gcc/gfortran use -march=native option.<div>With Intel i guess it is -xHost</div><div>This will enable the CPU native instruction.</div><div>With Epyc I guess a lot depends on the libraries. With gcc I used openblas and fftw3. On Ryzen they work great.</div><div>HTH,</div><div>Carlo</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Il giorno lun 16 nov 2020 alle ore 18:24 Husak Michal <<a href="mailto:Michal.Husak@vscht.cz">Michal.Husak@vscht.cz</a>> ha scritto:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">No. I do no use hyperthreading.<br>
I had checked both OpenMPI and OpenMP - in outup file ...<br>
It shows what I set by the launch and enviromental variable correctly.<br>
If I use more than 4 cores in any way, I get no speed up ...<br>
________________________________<br>
From: users <<a href="mailto:users-bounces@lists.quantum-espresso.org" target="_blank">users-bounces@lists.quantum-espresso.org</a>> on behalf of Pietro Delugas <<a href="mailto:pdelugas@sissa.it" target="_blank">pdelugas@sissa.it</a>><br>
Sent: Monday, November 16, 2020 3:42:59 PM<br>
To: Quantum ESPRESSO users Forum<br>
Subject: Re: [QE-users] Sub optimal performance on 32 core AMD machine<br>
<br>
Hi<br>
Are you using hyperthreading ?<br>
If yes, you should try to use only 32 cores. Check the total number of processors at the beginning of the run.<br>
The program makes an intense usage of the cpus so that hyperthreading is usually inefficient.<br>
Pietro<br>
<br>
Sent from Mail<<a href="https://go.microsoft.com/fwlink/?LinkId=550986" rel="noreferrer" target="_blank">https://go.microsoft.com/fwlink/?LinkId=550986</a>> for Windows 10<br>
<br>
From: Michal Husak<mailto:<a href="mailto:Michal.Husak@vscht.cz" target="_blank">Michal.Husak@vscht.cz</a>><br>
Sent: Monday, November 16, 2020 3:19 PM<br>
To: Quantum ESPRESSO users Forum<mailto:<a href="mailto:users@lists.quantum-espresso.org" target="_blank">users@lists.quantum-espresso.org</a>><br>
Subject: [QE-users] Sub optimal performance on 32 core AMD machine<br>
<br>
I<br>
<br>
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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><pre>------------------------------------------------------------
Prof. Carlo Nervi <a href="mailto:carlo.nervi@unito.it" target="_blank">carlo.nervi@unito.it</a> <a>Tel:+39</a> 0116707507/8
Fax: +39 0116707855 - Dipartimento di Chimica, via
P. Giuria 7, 10125 Torino, Italy. <a href="http://lem.ch.unito.it/" target="_blank">http://lem.ch.unito.it/</a><br></pre><pre><pre style="white-space:pre-wrap"><b>ICCC2020 has been postponed at 2022</b></pre><pre style="white-space:pre-wrap">ICCC 2022 28 August - 2 September 2022, Rimini, Italy: <a href="http://www.iccc2020.com/" style="color:rgb(17,85,204)" target="_blank">http://www.iccc2020.com</a>
International Conference on Coordination Chemistry (ICCC 2022)</pre></pre></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>