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36 message(FATAL_ERROR "OpenCL not available in double precision - Yet!")
39 # for some reason FindOpenCL checks CUDA_PATH but not CUDA_HOME
40 set(CMAKE_PREFIX_PATH ${CMAKE_PREFIX_PATH};$ENV{CUDA_HOME})
44 if (OpenCL_VERSION_STRING VERSION_LESS REQUIRED_OPENCL_MIN_VERSION)
45 message(FATAL_ERROR "OpenCL " "${OpenCL_VERSION_STRING}" " is not supported. OpenCL version " "${REQUIRED_OPENCL_MIN_VERSION}" " or newer is required.")
49 message(FATAL_ERROR "OpenCL not found.")
53 # Tell compiler to hide warnings for comments caused by cl_gl_ext.h on Linux
55 set(OpenCL_DEFINITIONS ${OpenCL_DEFINITIONS} " -Wno-comment")
58 # Yes Virginia, Darwin kernel version 14.4 corresponds to OS X 10.4.
59 if(APPLE AND ${CMAKE_SYSTEM_VERSION} VERSION_LESS "14.4")
60 message(WARNING "OS X prior to version 10.10.4 produces incorrect AMD OpenCL code at runtime. You will not be able to use AMD GPUs on this host unless you upgrade your operating system.")
63 add_definitions(${OpenCL_DEFINITIONS})
65 include_directories(SYSTEM ${OpenCL_INCLUDE_DIRS})
67 set(GMX_OPENCL_NB_CLUSTER_SIZE 8 CACHE STRING "Cluster size used by nonbonded OpenCL kernel. Set to 4 for Intel GPUs.")
68 mark_as_advanced(GMX_OPENCL_NB_CLUSTER_SIZE)
71 # no OpenMP is no good!
73 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.")