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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 # We need to call find_package even when we've already done the detection/setup
61 if(GMX_GPU OR GMX_GPU_AUTO)
62 if(NOT GMX_GPU AND NOT GMX_DETECT_GPU_AVAILABLE)
63 # Stay quiet when detection has occured and found no GPU.
64 # Noise is acceptable when there is a GPU or the user required one.
65 set(FIND_CUDA_QUIETLY QUIET)
67 find_package(CUDA ${REQUIRED_CUDA_VERSION} ${FIND_CUDA_QUIETLY})
69 # Cmake 2.8.12 (and CMake 3.0) introduced a new bug where the cuda
70 # library dir is added twice as an rpath on APPLE, which in turn causes
71 # the install_name_tool to wreck the binaries when it tries to remove this
72 # path. Since this is set inside the cuda module, we remove the extra rpath
73 # added in the library string - an rpath is not a library anyway, and at
74 # least for Gromacs this works on all CMake versions. This should be
75 # reasonably future-proof, since newer versions of CMake appear to handle
76 # the rpath automatically based on the provided library path, meaning
77 # the explicit rpath specification is no longer needed.
78 if(APPLE AND (CMAKE_VERSION VERSION_GREATER 2.8.11))
79 foreach(elem ${CUDA_LIBRARIES})
80 if(elem MATCHES "-Wl,.*")
81 list(REMOVE_ITEM CUDA_LIBRARIES ${elem})
87 # Depending on the current vale of GMX_GPU and GMX_GPU_AUTO:
88 # - OFF, FALSE: Will skip this detection/setup.
89 # - OFF, TRUE : Will keep GMX_GPU=OFF if no CUDA is detected, but will assemble
90 # a warning message which will be issued at the end of the
91 # configuration if GPU(s) were found in the build system.
92 # - ON , FALSE: The user requested GPU build and this requires CUDA, so we will
93 # fail if it is not available.
94 # - ON , TRUE : Can't happen (GMX_GPU=ON can only be user-set at this point)
95 if((GMX_GPU OR GMX_GPU_AUTO) AND NOT GMX_GPU_DETECTION_DONE)
96 if (EXISTS ${CUDA_TOOLKIT_ROOT_DIR})
97 set(CUDA_FOUND TRUE CACHE INTERNAL "Whether the CUDA toolkit was found" FORCE)
99 set(CUDA_FOUND FALSE CACHE INTERNAL "Whether the CUDA toolkit was found" FORCE)
102 # assemble warning/error message
103 if (GMX_DETECT_GPU_AVAILABLE)
104 set(_msg "${GMX_DETECT_GPU_COUNT} NVIDIA GPU(s) found in the system")
107 if (NOT GMX_DETECT_GPU_INFO STREQUAL "")
109 foreach(gpu ${GMX_DETECT_GPU_INFO})
115 # TODO remove the second part of the message when we'll have compute
116 # capability information from the detection.
118 Compute capability information not available, consult the NVIDIA website:
119 https://developer.nvidia.com/cuda-gpus")
122 set(CUDA_NOTFOUND_MESSAGE "mdrun supports native GPU acceleration on NVIDIA hardware with compute capability >= ${REQUIRED_CUDA_COMPUTE_CAPABILITY} (Fermi or later). This requires the NVIDIA CUDA toolkit, which was not found. Its location can be hinted by setting the CUDA_TOOLKIT_ROOT_DIR CMake option (does not work as an environment variable). The typical location would be /usr/local/cuda[-version]. Note that CPU or GPU acceleration can be selected at runtime.
129 # Disable GPU acceleration in auto mode
130 message(STATUS "No compatible CUDA toolkit found (v4.0+), disabling native GPU acceleration")
131 set_property(CACHE GMX_GPU PROPERTY VALUE OFF)
132 set(CUDA_NOTFOUND_AUTO ON)
134 # the user requested CUDA, but it wasn't found
135 message(FATAL_ERROR "${CUDA_NOTFOUND_MESSAGE}")
139 message(STATUS "Enabling native GPU acceleration")
140 set_property(CACHE GMX_GPU PROPERTY VALUE ON)
142 endif() # NOT CUDA_FOUND
144 # Annoyingly enough, FindCUDA leaves a few variables behind as non-advanced.
145 # We need to mark these advanced outside the conditional, otherwise, if the
146 # user turns GMX_GPU=OFF after a failed cmake pass, these variables will be
147 # left behind in the cache.
148 mark_as_advanced(CUDA_BUILD_CUBIN CUDA_BUILD_EMULATION CUDA_SDK_ROOT_DIR CUDA_VERBOSE_BUILD)
150 mark_as_advanced(CUDA_TOOLKIT_ROOT_DIR)
153 # Try to execute ${CUDA_NVCC_EXECUTABLE} --version and set the output
154 # (or an error string) in the argument variable.
155 # Note that semicolon is used as separator for nvcc.
158 # COMPILER_INFO - [output variable] string with compiler path, ID and
159 # some compiler-provided information
160 # COMPILER_FLAGS - [output variable] flags for the compiler
162 macro(get_cuda_compiler_info COMPILER_INFO COMPILER_FLAGS)
163 if(CUDA_NVCC_EXECUTABLE)
165 # Get the nvcc version string. This is multi-line, but since it is only 4 lines
166 # and might change in the future it is better to store than trying to parse out
167 # the version from the current format.
168 execute_process(COMMAND ${CUDA_NVCC_EXECUTABLE} --version
169 RESULT_VARIABLE _nvcc_version_res
170 OUTPUT_VARIABLE _nvcc_version_out
171 ERROR_VARIABLE _nvcc_version_err
172 OUTPUT_STRIP_TRAILING_WHITESPACE)
173 if (${_nvcc_version_res} EQUAL 0)
174 # Fix multi-line mess: Replace newline with ";" so we can use it in a define
175 string(REPLACE "\n" ";" _nvcc_info_singleline ${_nvcc_version_out})
176 SET(${COMPILER_INFO} "${CUDA_NVCC_EXECUTABLE} ${_nvcc_info_singleline}")
177 string(TOUPPER ${CMAKE_BUILD_TYPE} _build_type)
178 SET(_compiler_flags "${CUDA_NVCC_FLAGS_${_build_type}}")
179 if(CUDA_PROPAGATE_HOST_FLAGS)
180 string(REGEX REPLACE "[ ]+" ";" _cxx_flags_nospace "${BUILD_CXXFLAGS}")
182 SET(${COMPILER_FLAGS} "${CUDA_NVCC_FLAGS}${CUDA_NVCC_FLAGS_${_build_type}}; ${_cxx_flags_nospace}")
184 SET(${COMPILER_INFO} "N/A")
185 SET(${COMPILER_FLAGS} "N/A")
191 # set up nvcc options
192 include(gmxManageNvccConfig)
194 # Atomic operations used for polling wait for GPU
195 # (to avoid the cudaStreamSynchronize + ECC bug).
196 # ThreadMPI is now always included. Thus, we don't check for Atomics anymore here.
198 # no OpenMP is no good!
200 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.")