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33 # the research papers on the package. Check out http://www.gromacs.org.
35 # If the user did not set GMX_GPU we'll consider this option to be
36 # in "auto" mode meaning that we will:
37 # - search for CUDA and set GMX_GPU=ON we find it
38 # - check whether GPUs are present
39 # - if CUDA is not found but GPUs were detected issue a warning
40 if (NOT DEFINED GMX_GPU)
41 set(GMX_GPU_AUTO TRUE CACHE INTERNAL "GPU acceleration will be selected automatically")
43 option(GMX_GPU "Enable GPU acceleration" OFF)
45 if(GMX_GPU AND GMX_DOUBLE)
46 message(FATAL_ERROR "GPU acceleration is not available in double precision!")
48 if(GMX_GPU_AUTO AND GMX_DOUBLE)
49 message(WARNING "GPU acceleration is not available in double precision, disabled!")
50 set_property(CACHE GMX_GPU PROPERTY VALUE OFF)
51 set_property(CACHE GMX_GPU_AUTO PROPERTY VALUE OFF)
54 # detect GPUs in the build host machine
55 if ((GMX_GPU OR GMX_GPU_AUTO) AND NOT GMX_GPU_DETECTION_DONE)
60 # CMake 3.0-3.1 has a bug in the following case, which breaks
61 # configuration on at least BlueGene/Q. Fixed in 3.1.1
62 if ((NOT CMAKE_VERSION VERSION_LESS "3.0.0") AND
63 (CMAKE_VERSION VERSION_LESS "3.1.1") AND
64 (CMAKE_CROSSCOMPILING AND NOT CMAKE_SYSTEM_PROCESSOR))
65 message(STATUS "Cannot search for CUDA because the CMake find package has a bug. Set a valid CMAKE_SYSTEM_PROCESSOR if you need to detect CUDA")
67 set(CAN_RUN_CUDA_FIND_PACKAGE 1)
70 # We need to call find_package even when we've already done the detection/setup
71 if(GMX_GPU OR GMX_GPU_AUTO AND CAN_RUN_CUDA_FIND_PACKAGE)
72 if(NOT GMX_GPU AND NOT GMX_DETECT_GPU_AVAILABLE)
73 # Stay quiet when detection has occured and found no GPU.
74 # Noise is acceptable when there is a GPU or the user required one.
75 set(FIND_CUDA_QUIETLY QUIET)
77 find_package(CUDA ${REQUIRED_CUDA_VERSION} ${FIND_CUDA_QUIETLY})
79 # Cmake 2.8.12 (and CMake 3.0) introduced a new bug where the cuda
80 # library dir is added twice as an rpath on APPLE, which in turn causes
81 # the install_name_tool to wreck the binaries when it tries to remove this
82 # path. Since this is set inside the cuda module, we remove the extra rpath
83 # added in the library string - an rpath is not a library anyway, and at
84 # least for Gromacs this works on all CMake versions. This should be
85 # reasonably future-proof, since newer versions of CMake appear to handle
86 # the rpath automatically based on the provided library path, meaning
87 # the explicit rpath specification is no longer needed.
88 if(APPLE AND (CMAKE_VERSION VERSION_GREATER 2.8.11))
89 foreach(elem ${CUDA_LIBRARIES})
90 if(elem MATCHES "-Wl,.*")
91 list(REMOVE_ITEM CUDA_LIBRARIES ${elem})
97 # Depending on the current vale of GMX_GPU and GMX_GPU_AUTO:
98 # - OFF, FALSE: Will skip this detection/setup.
99 # - OFF, TRUE : Will keep GMX_GPU=OFF if no CUDA is detected, but will assemble
100 # a warning message which will be issued at the end of the
101 # configuration if GPU(s) were found in the build system.
102 # - ON , FALSE: The user requested GPU build and this requires CUDA, so we will
103 # fail if it is not available.
104 # - ON , TRUE : Can't happen (GMX_GPU=ON can only be user-set at this point)
105 if((GMX_GPU OR GMX_GPU_AUTO) AND NOT GMX_GPU_DETECTION_DONE)
106 if (EXISTS ${CUDA_TOOLKIT_ROOT_DIR})
107 set(CUDA_FOUND TRUE CACHE INTERNAL "Whether the CUDA toolkit was found" FORCE)
109 set(CUDA_FOUND FALSE CACHE INTERNAL "Whether the CUDA toolkit was found" FORCE)
112 # assemble warning/error message
113 if (GMX_DETECT_GPU_AVAILABLE)
114 set(_msg "${GMX_DETECT_GPU_COUNT} NVIDIA GPU(s) found in the system")
117 if (NOT GMX_DETECT_GPU_INFO STREQUAL "")
119 foreach(gpu ${GMX_DETECT_GPU_INFO})
125 # TODO remove the second part of the message when we'll have compute
126 # capability information from the detection.
128 Compute capability information not available, consult the NVIDIA website:
129 https://developer.nvidia.com/cuda-gpus")
132 set(CUDA_NOTFOUND_MESSAGE "mdrun supports native GPU acceleration on NVIDIA hardware with compute capability >= ${REQUIRED_CUDA_COMPUTE_CAPABILITY} (Fermi or later). This requires the NVIDIA CUDA toolkit, which was not found. Its location can be hinted by setting the CUDA_TOOLKIT_ROOT_DIR CMake option (does not work as an environment variable). The typical location would be /usr/local/cuda[-version]. Note that CPU or GPU acceleration can be selected at runtime.
139 # Disable GPU acceleration in auto mode
140 message(STATUS "No compatible CUDA toolkit found (v5.0+), disabling native GPU acceleration")
141 set_property(CACHE GMX_GPU PROPERTY VALUE OFF)
142 set(CUDA_NOTFOUND_AUTO ON)
144 # the user requested CUDA, but it wasn't found
145 message(FATAL_ERROR "${CUDA_NOTFOUND_MESSAGE}")
149 message(STATUS "Enabling native GPU acceleration")
150 set_property(CACHE GMX_GPU PROPERTY VALUE ON)
152 endif() # NOT CUDA_FOUND
155 # Try to find NVML if a GPU accelerated binary should be build.
157 if (DEFINED NVML_LIBRARY)
158 set(NVML_FIND_QUIETLY TRUE)
161 option(GMX_USE_NVML "Use NVML support for better CUDA performance" ${NVML_FOUND})
162 mark_as_advanced(GMX_USE_NVML)
165 include_directories(SYSTEM ${NVML_INCLUDE_DIR})
167 list(APPEND GMX_EXTRA_LIBRARIES ${NVML_LIBRARY})
169 message(FATAL_ERROR "NVML support was required, but was not detected. Please consult the install guide.")
174 # Annoyingly enough, FindCUDA leaves a few variables behind as non-advanced.
175 # We need to mark these advanced outside the conditional, otherwise, if the
176 # user turns GMX_GPU=OFF after a failed cmake pass, these variables will be
177 # left behind in the cache.
178 mark_as_advanced(CUDA_BUILD_CUBIN CUDA_BUILD_EMULATION CUDA_SDK_ROOT_DIR CUDA_VERBOSE_BUILD)
180 mark_as_advanced(CUDA_TOOLKIT_ROOT_DIR)
183 # Try to execute ${CUDA_NVCC_EXECUTABLE} --version and set the output
184 # (or an error string) in the argument variable.
185 # Note that semicolon is used as separator for nvcc.
188 # COMPILER_INFO - [output variable] string with compiler path, ID and
189 # some compiler-provided information
190 # COMPILER_FLAGS - [output variable] flags for the compiler
192 macro(get_cuda_compiler_info COMPILER_INFO COMPILER_FLAGS)
193 if(CUDA_NVCC_EXECUTABLE)
195 # Get the nvcc version string. This is multi-line, but since it is only 4 lines
196 # and might change in the future it is better to store than trying to parse out
197 # the version from the current format.
198 execute_process(COMMAND ${CUDA_NVCC_EXECUTABLE} --version
199 RESULT_VARIABLE _nvcc_version_res
200 OUTPUT_VARIABLE _nvcc_version_out
201 ERROR_VARIABLE _nvcc_version_err
202 OUTPUT_STRIP_TRAILING_WHITESPACE)
203 if (${_nvcc_version_res} EQUAL 0)
204 # Fix multi-line mess: Replace newline with ";" so we can use it in a define
205 string(REPLACE "\n" ";" _nvcc_info_singleline ${_nvcc_version_out})
206 SET(${COMPILER_INFO} "${CUDA_NVCC_EXECUTABLE} ${_nvcc_info_singleline}")
207 string(TOUPPER ${CMAKE_BUILD_TYPE} _build_type)
208 SET(_compiler_flags "${CUDA_NVCC_FLAGS_${_build_type}}")
209 if(CUDA_PROPAGATE_HOST_FLAGS)
210 string(REGEX REPLACE "[ ]+" ";" _cxx_flags_nospace "${BUILD_CXXFLAGS}")
212 SET(${COMPILER_FLAGS} "${CUDA_NVCC_FLAGS}${CUDA_NVCC_FLAGS_${_build_type}}; ${_cxx_flags_nospace}")
214 SET(${COMPILER_INFO} "N/A")
215 SET(${COMPILER_FLAGS} "N/A")
220 include(CMakeDependentOption)
221 include(gmxOptionUtilities)
224 # set up nvcc options
225 include(gmxManageNvccConfig)
227 gmx_check_if_changed(_cuda_version_changed CUDA_VERSION)
229 # Generate CUDA RT API version string which will end up in config.h
230 # We do this because nvcc is silly enough to not define its own version
231 # (which should match the CUDA runtime API version AFAICT) and we want to
232 # avoid creating the fragile dependency on cuda_runtime_api.h.
234 # NOTE: CUDA v7.5 is expected to have nvcc define it own version, so in the
235 # future we should switch to using that version string instead of our own.
236 if (NOT GMX_CUDA_VERSION OR _cuda_version_changed)
237 MATH(EXPR GMX_CUDA_VERSION "${CUDA_VERSION_MAJOR}*1000 + ${CUDA_VERSION_MINOR}*10")
240 if (_cuda_version_changed)
241 # check the generated CUDA API version against the one present in cuda_runtime_api.h
242 try_compile(_get_cuda_version_compile_res
244 ${CMAKE_SOURCE_DIR}/cmake/TestCUDAVersion.c
245 COMPILE_DEFINITIONS "-DGMX_CUDA_VERSION=${GMX_CUDA_VERSION}"
246 CMAKE_FLAGS "-DINCLUDE_DIRECTORIES=${CUDA_TOOLKIT_INCLUDE}"
247 OUTPUT_VARIABLE _get_cuda_version_compile_out)
249 if (NOT _get_cuda_version_compile_res)
250 if (_get_cuda_version_compile_out MATCHES "CUDA version mismatch")
251 message(FATAL_ERROR "The CUDA API version generated internally from the compiler version does not match the version reported by cuda.h. This means either that the CUDA detection picked up mismatching nvcc and the CUDA headers (likely not part of the same toolkit installation) or that there is an error in the internal version generation. If you are sure that it is not the former causing the error (check the relevant cache variables), define the GMX_CUDA_VERSION cache variable to work around the error.")
253 message(FATAL_ERROR "Could not detect CUDA runtime API version")
258 # no OpenMP is no good!
260 message(WARNING "To use GPU acceleration efficiently, mdrun requires OpenMP multi-threading. Without OpenMP a single CPU core can be used with a GPU which is not optimal. Note that with MPI multiple processes can be forced to use a single GPU, but this is typically inefficient. You need to set both C and C++ compilers that support OpenMP (CC and CXX environment variables, respectively) when using GPUs.")
264 cmake_dependent_option(GMX_CUDA_NB_SINGLE_COMPILATION_UNIT
265 "Whether to compile the CUDA non-bonded module using a single compilation unit." ON
267 mark_as_advanced(GMX_CUDA_NB_SINGLE_COMPILATION_UNIT)
270 # We need to use single compilation unit for kernels:
271 # - when compiling for CC 2.x devices where buggy kernel code is generated
272 gmx_check_if_changed(_gmx_cuda_target_changed GMX_CUDA_TARGET_SM GMX_CUDA_TARGET_COMPUTE CUDA_NVCC_FLAGS)
273 if(_gmx_cuda_target_changed OR NOT GMX_GPU_DETECTION_DONE)
274 if((NOT GMX_CUDA_TARGET_SM AND NOT GMX_CUDA_TARGET_COMPUTE) OR
275 (GMX_CUDA_TARGET_SM MATCHES "2[01]" OR GMX_CUDA_TARGET_COMPUTE MATCHES "2[01]"))
276 message(STATUS "Enabling single compilation unit for the CUDA non-bonded module. Multiple compilation units are not compatible with CC 2.x devices, to enable the feature specify only CC >=3.0 target architectures in GMX_CUDA_TARGET_SM/GMX_CUDA_TARGET_COMPUTE.")
277 set_property(CACHE GMX_CUDA_NB_SINGLE_COMPILATION_UNIT PROPERTY VALUE ON)
279 message(STATUS "Enabling multiple compilation units for the CUDA non-bonded module.")
280 set_property(CACHE GMX_CUDA_NB_SINGLE_COMPILATION_UNIT PROPERTY VALUE OFF)