Hi Jakob, I know that someone coming to the EasyBuild user meeting is interested in writing an easyblock for ELPA.
Alan On Fri, 11 Jan 2019 at 12:48, Jakob Schiøtz <[email protected]<mailto:[email protected]>> wrote: Dear all, I did not get any response to this before Christmas. Does anybody have any ideas that might help me? Best regards Jakob > On 18 Dec 2018, at 15:00, Jakob Schiøtz > <[email protected]<mailto:[email protected]>> wrote: > > Hi, > > I am trying to build the newest version of ELPA (Eigenvalue SoLvers for > Petaflop-Applications, https://elpa.mpcdf.mpg.de/). It looks like ELPA > builds a number of “kernels” that are chosen at runtime depending on the > capabilities of the CPU, for example SSE, AVX, AVX2 or AVX512. > > Unfortunately, with the foss toolchain the compiler refuses to build these > kernels if the CPU does not support them (the Intel toolchain happily builds > them). This means that I have to configure ELPA with --disable-avx2 or > --disable-avx if the CPU does not support these instructions, and > --enable-avx512 if the CPU does support that. > > Is there some way to do this easily in an easyconfig? Maybe a compiler flag > that allows using “AVX2 gcc intrinsics” in the code, without otherwise > turning on AVX2 instructions (as that would cause the rest of the code to > fail if AVX2 is not supported). > > Or do I have to write some complicated stuff into an easyblock? And if I do > the latter, do you know how to portably detect the capabilities of the CPU? > > It seems somewhat silly that the ELPA configure script tests if these > instructions are supported and fails if one does not manually disable the > unsupported versions instead of just doing the right thing. But that is > beyond my control. > > Best regards > > Jakob > > -- > Jakob Schiøtz, professor, Ph.D. > Department of Physics > Technical University of Denmark > DK-2800 Kongens Lyngby, Denmark > http://www.fysik.dtu.dk/~schiotz/ > > > -- Jakob Schiøtz, professor, Ph.D. Department of Physics Technical University of Denmark DK-2800 Kongens Lyngby, Denmark http://www.fysik.dtu.dk/~schiotz/ -- Dr. Alan O'Cais E-CAM Software Manager Juelich Supercomputing Centre Forschungszentrum Juelich GmbH 52425 Juelich, Germany Phone: +49 2461 61 5213 Fax: +49 2461 61 6656 E-mail: [email protected]<mailto:[email protected]> WWW: http://www.fz-juelich.de/ias/jsc/EN ------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------ Forschungszentrum Juelich GmbH 52425 Juelich Sitz der Gesellschaft: Juelich Eingetragen im Handelsregister des Amtsgerichts Dueren Nr. HR B 3498 Vorsitzender des Aufsichtsrats: MinDir Dr. Karl Eugen Huthmacher Geschaeftsfuehrung: Prof. Dr.-Ing. Wolfgang Marquardt (Vorsitzender), Karsten Beneke (stellv. Vorsitzender), Prof. Dr.-Ing. Harald Bolt, Prof. Dr. Sebastian M. Schmidt ------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------
