[gmx-users] AVX_512 and GROMACS

[tarzan p]

Hi all.I have a dual socket Xeon GOLD 6148 which has the capabilities for 

 Instruction Set Extensions   Intel® SSE4.2, Intel® AVX, Intel® AVX2, Intel® AVX-512
but hen why si gromacs giving the error for AVX_512 but takes AVX2_256???
Adding the out put 


/Downloads/gromacs-2019/build-gromacs$ cmake .. -DGMX_SIMD=AVX_512-- Enabling RDTSCP support
-- Performing Test C_xCORE_AVX512_qopt_zmm_usage_high_FLAG_ACCEPTED
-- Performing Test C_xCORE_AVX512_qopt_zmm_usage_high_FLAG_ACCEPTED - Failed
-- Performing Test C_xCORE_AVX512_FLAG_ACCEPTED
-- Performing Test C_xCORE_AVX512_FLAG_ACCEPTED - Failed
-- Performing Test C_mavx512f_mfma_FLAG_ACCEPTED
-- Performing Test C_mavx512f_mfma_FLAG_ACCEPTED - Failed
-- Performing Test C_mavx512f_FLAG_ACCEPTED
-- Performing Test C_mavx512f_FLAG_ACCEPTED - Failed
-- Performing Test C_arch_AVX_FLAG_ACCEPTED
-- Performing Test C_arch_AVX_FLAG_ACCEPTED - Failed
-- Performing Test C_hgnu_FLAG_ACCEPTED
-- Performing Test C_hgnu_FLAG_ACCEPTED - Failed
-- Performing Test C_COMPILE_WORKS_WITHOUT_SPECIAL_FLAGS
-- Performing Test C_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)
-- Performing Test CXX_xCORE_AVX512_qopt_zmm_usage_high_FLAG_ACCEPTED
-- Performing Test CXX_xCORE_AVX512_qopt_zmm_usage_high_FLAG_ACCEPTED - Failed
-- Performing Test CXX_xCORE_AVX512_FLAG_ACCEPTED
-- Performing Test CXX_xCORE_AVX512_FLAG_ACCEPTED - Failed
-- Performing Test CXX_mavx512f_mfma_FLAG_ACCEPTED
-- Performing Test CXX_mavx512f_mfma_FLAG_ACCEPTED - Failed
-- Performing Test CXX_mavx512f_FLAG_ACCEPTED
-- Performing Test CXX_mavx512f_FLAG_ACCEPTED - Failed
-- Performing Test CXX_arch_AVX_FLAG_ACCEPTED
-- Performing Test CXX_arch_AVX_FLAG_ACCEPTED - Failed
-- Performing Test CXX_hgnu_FLAG_ACCEPTED
-- Performing Test CXX_hgnu_FLAG_ACCEPTED - Failed
-- 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)
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)


-- Configuring incomplete, errors occurred!
See also "/home/gdd/Downloads/gromacs-2019/build-gromacs/CMakeFiles/CMakeOutput.log".
See also "/home/gdd/Downloads/gromacs-2019/build-gromacs/CMakeFiles/CMakeError.log".


~/Downloads/gromacs-2019/build-gromacs$ cmake .. -DGMX_SIMD=AVX2_256-- Performing Test C_mavx2_mfma_FLAG_ACCEPTED
-- Performing Test C_mavx2_mfma_FLAG_ACCEPTED - Success
-- Performing Test C_mavx2_mfma_COMPILE_WORKS
-- Performing Test C_mavx2_mfma_COMPILE_WORKS - Success
-- Performing Test CXX_mavx2_mfma_FLAG_ACCEPTED
-- Performing Test CXX_mavx2_mfma_FLAG_ACCEPTED - Success
-- Performing Test CXX_mavx2_mfma_COMPILE_WORKS
-- Performing Test CXX_mavx2_mfma_COMPILE_WORKS - Success
-- Enabling 256-bit AVX2 SIMD instructions using CXX flags:  -mavx2 -mfma
-- Performing Test _Wno_unused_command_line_argument_FLAG_ACCEPTED
-- Performing Test _Wno_unused_command_line_argument_FLAG_ACCEPTED - Success
-- The GROMACS-managed build of FFTW 3 will configure with the following optimizations: --enable-sse2;--enable-avx;--enable-avx2
-- Configuring done
-- Generating done
-- Build files have been written to: /home/gdd/Downloads/gromacs-2019/build-gromacs