That tells you what your CPU is capable of. We need to know whether cmake has found the compiler that can issue the instructions. Follow the suggestions Roland and I have made.
Mark On Wed, 15 Jan 2020 at 10:45, Shlomit Afgin <shlomit.af...@weizmann.ac.il> wrote: > > > I ran: > > cat /proc/cpuinfo | grep -i avx512 > > > > and got: > > avx512f avx512dq avx512cd avx512bw avx512vl > > > > So I thought I can use it. Am I wrong? > > > > Shlomit > > > > On 15/01/2020, 11:14, "gromacs.org_gmx-users-boun...@maillist.sys.kth.se > on behalf of Szilárd Páll" < > gromacs.org_gmx-users-boun...@maillist.sys.kth.se on behalf of > pall.szil...@gmail.com> wrote: > > > > Hi, > > > > What hardware are you targeting? Unless you need AVX512 support, you > could > > just manually specify the appropriate setting in GMX_SIMD, e.g. > > -DGMX_SIMD=AVX2_256 would be appropriate for most cases where AVX512 > is not > > supported. > > > > Cheers, > > -- > > Szilárd > > > > > > On Wed, Jan 15, 2020 at 9:51 AM Shlomit Afgin < > shlomit.af...@weizmann.ac.il> > > wrote: > > > > > > > > Hi, > > > I tried to install GROMACS 2019.5 on CentOS7, > > > cmake .. -DGMX_BUILD_OWN_FFTW=ON -DREGRESSIONTEST_DOWNLOAD=ON > > > > > > I have already installed devtoolset-6 and still get this error: > > > > > > -- Performing Test CXX_COMPILE_WORKS_WITHOUT_SPECIAL_FLAGS > > > -- Performing Test CXX_COMPILE_WORKS_WITHOUT_SPECIAL_FLAGS - Failed > > > -- Could not find any flag to build test source (this could be due to > > > either the compiler or binutils) > > > -- Could not identify number of AVX-512 units - detection program > missing > > > compilation prerequisites > > > -- Could not run code to detect number of AVX-512 FMA units - > assuming 2. > > > -- Detected best SIMD instructions for this CPU - AVX_512 > > > CMake Error at cmake/gmxManageSimd.cmake:51 (message): > > > Cannot find AVX 512F compiler flag. Use a newer compiler, or > choose a > > > lower level of SIMD (slower). > > > Call Stack (most recent call first): > > > cmake/gmxManageSimd.cmake:186 > > > (gmx_give_fatal_error_when_simd_support_not_found) > > > CMakeLists.txt:719 (gmx_manage_simd) > > > > > > > > > Thanks, > > > Shlomit > > > -- > > > Gromacs Users mailing list > > > > > > * Please search the archive at > > > http://www.gromacs.org/Support/Mailing_Lists/GMX-Users_List before > > > posting! > > > > > > * Can't post? Read http://www.gromacs.org/Support/Mailing_Lists > > > > > > * For (un)subscribe requests visit > > > https://maillist.sys.kth.se/mailman/listinfo/gromacs.org_gmx-users > or > > > send a mail to gmx-users-requ...@gromacs.org. > > > > > -- > > Gromacs Users mailing list > > > > * Please search the archive at > http://www.gromacs.org/Support/Mailing_Lists/GMX-Users_List before > posting! > > > > * Can't post? Read http://www.gromacs.org/Support/Mailing_Lists > > > > * For (un)subscribe requests visit > > https://maillist.sys.kth.se/mailman/listinfo/gromacs.org_gmx-users or > send a mail to gmx-users-requ...@gromacs.org. > -- > Gromacs Users mailing list > > * Please search the archive at > http://www.gromacs.org/Support/Mailing_Lists/GMX-Users_List before > posting! > > * Can't post? Read http://www.gromacs.org/Support/Mailing_Lists > > * For (un)subscribe requests visit > https://maillist.sys.kth.se/mailman/listinfo/gromacs.org_gmx-users or > send a mail to gmx-users-requ...@gromacs.org. -- Gromacs Users mailing list * Please search the archive at http://www.gromacs.org/Support/Mailing_Lists/GMX-Users_List before posting! * Can't post? Read http://www.gromacs.org/Support/Mailing_Lists * For (un)subscribe requests visit https://maillist.sys.kth.se/mailman/listinfo/gromacs.org_gmx-users or send a mail to gmx-users-requ...@gromacs.org.
