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35 # Manage setup of the different FFT libraries we can use in Gromacs.
38 # Intel 11 and up makes life somewhat easy if you just want to use
39 # all their stuff. It's not easy if you only want some of their
41 set(MKL_MANUALLY FALSE)
42 if (GMX_FFT_LIBRARY STREQUAL "MKL" AND
43 NOT (CMAKE_C_COMPILER_ID MATCHES "Intel" AND CMAKE_C_COMPILER_VERSION VERSION_GREATER "11"))
44 # The user will have to provide the set of magic libraries in
45 # MKL_LIBRARIES (see below), which we cache (non-advanced), so that they
46 # don't have to keep specifying it, and can easily see that
47 # CMake is still using that information.
48 set(MKL_MANUALLY TRUE)
50 set(MKL_LIBRARIES_FORMAT_DESCRIPTION "Use full paths to library files, in the right order, and separated by semicolons.")
51 gmx_dependent_cache_variable(
53 "List of libraries for linking to MKL. ${MKL_LIBRARIES_FORMAT_DESCRIPTION}"
56 gmx_dependent_cache_variable(
58 "Path to mkl.h (non-inclusive)."
61 if(${GMX_FFT_LIBRARY} STREQUAL "FFTW3")
68 if(GMX_BUILD_OWN_FFTW)
69 add_subdirectory(src/contrib/fftw)
71 find_package(FFTW COMPONENTS ${FFTW})
74 string(TOUPPER "${FFTW}" FFTW)
76 MESSAGE(FATAL_ERROR "Cannot find FFTW 3 (with correct precision - libfftw3f for mixed-precision GROMACS or libfftw3 for double-precision GROMACS). Either choose the right precision, choose another FFT(W) library (-DGMX_FFT_LIBRARY), enable the advanced option to let GROMACS build FFTW 3 for you (-GMX_BUILD_OWN_FFTW=ON), or use the really slow GROMACS built-in fftpack library (-DGMX_FFT_LIBRARY=fftpack).")
79 set(PKG_FFT "${${FFTW}_PKG}")
80 if (GMX_BUILD_OWN_FFTW)
81 include_directories(BEFORE ${${FFTW}_INCLUDE_DIRS})
83 include_directories(${${FFTW}_INCLUDE_DIRS})
85 set(FFT_LIBRARIES ${${FFTW}_LIBRARIES})
88 if ((${GMX_SIMD} MATCHES "SSE" OR ${GMX_SIMD} MATCHES "AVX") AND NOT ${FFTW}_HAVE_SIMD)
89 message(WARNING "The fftw library found is compiled without SIMD support, which makes it slow. Consider recompiling it or contact your admin")
92 if((${GMX_SIMD} MATCHES "SSE" OR ${GMX_SIMD} MATCHES "AVX") AND ${FFTW}_HAVE_AVX)
93 # If we're not using SIMD instructions, we don't care about FFTW performance on x86 either
94 message(WARNING "The FFTW library was compiled with --enable-avx to enable AVX SIMD instructions. That might sound like a good idea for your processor, but for FFTW versions up to 3.3.3, these are slower than the SSE/SSE2 SIMD instructions for the way GROMACS uses FFTs. Limitations in the way FFTW allows GROMACS to measure performance make it awkward for either GROMACS or FFTW to make the decision for you based on runtime performance. You should compile a different FFTW library with --enable-sse or --enable-sse2. If you have a more recent FFTW, you may like to compare the performance of GROMACS with FFTW libraries compiled with and without --enable-avx. However, the GROMACS developers do not really expect the FFTW AVX optimization to help, because the performance is limited by memory access, not computation.")
97 set(FFT_STATUS_MESSAGE "Using external FFT library - FFTW3")
98 elseif(${GMX_FFT_LIBRARY} STREQUAL "MKL")
99 # Intel 11 and up makes life somewhat easy if you just want to use
100 # all their stuff. It's not easy if you only want some of their
102 if (NOT MKL_MANUALLY)
103 # The next line takes care of everything for MKL
105 # This works according to the Intel MKL 10.3 for Windows
106 # docs, but on Jenkins Win2k8, icl tries to interpret it
108 set(FFT_LINKER_FLAGS "/Qmkl:sequential")
110 set(FFT_LINKER_FLAGS "-mkl=sequential")
112 # Some versions of icc require this in order that mkl.h can be
113 # found at compile time.
114 set(EXTRA_C_FLAGS "${EXTRA_C_FLAGS} ${FFT_LINKER_FLAGS}")
116 set(MKL_ERROR_MESSAGE "Make sure you have configured your compiler so that ${FFT_LINKER_FLAGS} will work.")
118 include_directories(${MKL_INCLUDE_DIR})
119 set(FFT_LIBRARIES "${MKL_LIBRARIES}")
120 set(MKL_ERROR_MESSAGE "The include path to mkl.h in MKL_INCLUDE_DIR, and the link libraries in MKL_LIBRARIES=${MKL_LIBRARIES} need to match what the MKL documentation says you need for your system: ${MKL_LIBRARIES_FORMAT_DESCRIPTION}")
121 # Convert the semi-colon separated list to a list of
122 # command-line linker arguments so that code using our
123 # pkgconfig setup can use it.
124 string(REGEX REPLACE ";" " " PKG_FFT_LIBS "${MKL_LIBRARIES}")
127 # Check MKL works. If we were in a non-global scope, we wouldn't
128 # have to play nicely.
129 set(old_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
130 set(CMAKE_REQUIRED_FLAGS "${FFT_LINKER_FLAGS}")
131 set(old_CMAKE_REQUIRED_LIBRARIES "${CMAKE_REQUIRED_LIBRARIES}")
132 set(CMAKE_REQUIRED_LIBRARIES "${FFT_LIBRARIES}")
134 check_function_exists(DftiCreateDescriptor TEST_MKL)
136 set(CMAKE_REQUIRED_FLAGS "${old_CMAKE_REQUIRED_FLAGS}")
137 set(CMAKE_REQUIRED_LIBRARIES "${old_CMAKE_REQUIRED_LIBRARIES}")
140 # Hack to help the user vary MKL settings until they work.
141 # TODO Make this logic more useful.
142 unset(TEST_MKL CACHE)
143 message(FATAL_ERROR "Linking with MKL was requested, but was not successful: ${MKL_ERROR_MESSAGE}")
146 # Set variables to signal that we have MKL available and should use it for FFTs.
150 set(FFT_STATUS_MESSAGE "Using external FFT library - Intel MKL")
151 elseif(${GMX_FFT_LIBRARY} STREQUAL "FFTPACK")
152 set(GMX_FFT_FFTPACK 1)
153 set(FFT_STATUS_MESSAGE "Using internal FFT library - fftpack")
155 gmx_invalid_option_value(GMX_FFT_LIBRARY)
157 gmx_check_if_changed(FFT_CHANGED GMX_FFT_LIBRARY)
159 message(STATUS "${FFT_STATUS_MESSAGE}")
162 # enable threaded fftw3 if we've found it
163 if(FFTW3_THREADS OR FFTW3F_THREADS)
164 add_definitions(-DFFT5D_FFTW_THREADS)