[gmx-users] Error: Cannot find AVX 512F compiler flag

[Mark Abraham]

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.afgin at 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-bounces at maillist.sys.kth.se
> on behalf of Szilárd Páll" <
> gromacs.org_gmx-users-bounces at maillist.sys.kth.se on behalf of
> pall.szilard at 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.afgin at 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
>
>     > --
>
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