While compiling with gcc/gfortran use -march=native option. With Intel i guess it is -xHost This will enable the CPU native instruction. With Epyc I guess a lot depends on the libraries. With gcc I used openblas and fftw3. On Ryzen they work great. HTH, Carlo
Il giorno lun 16 nov 2020 alle ore 18:24 Husak Michal <[email protected]> ha scritto: > No. I do no use hyperthreading. > I had checked both OpenMPI and OpenMP - in outup file ... > It shows what I set by the launch and enviromental variable correctly. > If I use more than 4 cores in any way, I get no speed up ... > ________________________________ > From: users <[email protected]> on behalf of > Pietro Delugas <[email protected]> > Sent: Monday, November 16, 2020 3:42:59 PM > To: Quantum ESPRESSO users Forum > Subject: Re: [QE-users] Sub optimal performance on 32 core AMD machine > > Hi > Are you using hyperthreading ? > If yes, you should try to use only 32 cores. Check the total number of > processors at the beginning of the run. > The program makes an intense usage of the cpus so that hyperthreading is > usually inefficient. > Pietro > > Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for > Windows 10 > > From: Michal Husak<mailto:[email protected]> > Sent: Monday, November 16, 2020 3:19 PM > To: Quantum ESPRESSO users Forum<mailto:[email protected]> > Subject: [QE-users] Sub optimal performance on 32 core AMD machine > > I > > _______________________________________________ > Quantum ESPRESSO is supported by MaX (www.max-centre.eu) > users mailing list [email protected] > https://lists.quantum-espresso.org/mailman/listinfo/users > -- ------------------------------------------------------------ Prof. Carlo Nervi [email protected] Tel:+39 0116707507/8 Fax: +39 0116707855 - Dipartimento di Chimica, via P. Giuria 7, 10125 Torino, Italy. http://lem.ch.unito.it/ *ICCC2020 has been postponed at 2022* ICCC 2022 28 August - 2 September 2022, Rimini, Italy: http://www.iccc2020.com International Conference on Coordination Chemistry (ICCC 2022)
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