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36 message(FATAL_ERROR "OpenCL not available in double precision - Yet!")
40 # TODO: FindOpenCL module is available in cmake starting with version 3.1.0.
41 # A modified version of that module is used here.
42 # Remove FindOpenCL.cmake file when GROMACS switches to cmake 3.1.0 or higher.
46 if (OPENCL_VERSION_STRING VERSION_LESS REQUIRED_OPENCL_MIN_VERSION)
47 message(FATAL_ERROR "OpenCL " "${OPENCL_VERSION_STRING}" " is not supported. OpenCL version " "${REQUIRED_OPENCL_MIN_VERSION}" " or newer is required.")
51 message(FATAL_ERROR "OpenCL not found.")
55 # Tell compiler to hide warnings for comments caused by cl_gl_ext.h on Linux
57 set(OPENCL_DEFINITIONS ${OPENCL_DEFINITIONS} " -Wno-comment")
60 # Yes Virginia, Darwin kernel version 14.4 corresponds to OS X 10.4.
61 if(APPLE AND ${CMAKE_SYSTEM_VERSION} VERSION_LESS "14.4")
62 message(WARNING "OS X prior to version 10.10.4 produces incorrect AMD OpenCL code at runtime. You will not be able to use AMD GPUs on this host unless you upgrade your operating system.")
65 add_definitions(${OPENCL_DEFINITIONS})
67 include_directories(SYSTEM ${OPENCL_INCLUDE_DIRS})
70 # no OpenMP is no good!
72 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.")