All, >> FFTW 3.3.5 (at least for this toolchain) should be compiled with >> --enable-sse2 --enable-avx --enable-avx2 >> and preferably with --enable-avx512 too. > I'm looking into this, but even though the FFTW documentation clearly > states that an FFTW library compiled with AVX2 will run just fine on a > system without AVX2, it seems like *building* FFTW with --enable-avx2 on > a system that doesn't support AVX2 doesn't work... > > Here's what I'm seeing on a Sandy Bridge systems: > > configure flags: > > --enable-threads --enable-openmp --with-pic --enable-single > --enable-mpi --enable-sse2 --enable-avx --enable-avx2 --enable-avx512 > > fails with: > > In file included from ../../../dft/simd/n1f.h:21:0, > from ../common/n1fv_12.c:35, > from n1fv_12.c:3: > ../../../simd-support/simd-avx2.h:43:2: error: #error "compiling > simd-avx2.h without avx2 support" > #error "compiling simd-avx2.h without avx2 support" > ^~~~~ > > > So, I don't think that including all of these --enable-avx* flags is > going to work out well, unless we implement an FFTW easyblock that > auto-detects *what* is really supported and injects the corresponding > --enable-avx* flags.
Thinking cross-platform: None of the '--enable-sse2' or '--enable-avx*' flags will work on POWER or ARM... Markus -- Dr. Markus Geimer Juelich Supercomputing Centre Institute for Advanced Simulation Forschungszentrum Juelich GmbH 52425 Juelich, Germany Phone: +49-2461-61-1773 Fax: +49-2461-61-6656 E-mail: [email protected] WWW: http://www.fz-juelich.de/jsc/ ------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------ 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 ------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------
