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36 # Manage the MPI setup, assuming that CMAKE_C_COMPILER is an MPI
40 message(STATUS "MPI is not compatible with thread-MPI. Disabling thread-MPI.")
41 set(GMX_THREAD_MPI OFF CACHE BOOL
42 "Build a thread-MPI-based multithreaded version of GROMACS (not compatible with MPI)" FORCE)
45 # Test the CMAKE_C_COMPILER for being an MPI (wrapper) compiler
46 TRY_COMPILE(MPI_FOUND ${CMAKE_BINARY_DIR}
47 "${CMAKE_SOURCE_DIR}/cmake/TestMPI.cpp"
50 # If CMAKE_C_COMPILER is not a MPI wrapper. Try to find MPI using cmake module as fall-back.
54 set(MPI_COMPILE_FLAGS ${MPI_C_COMPILE_FLAGS})
55 separate_arguments(MPI_COMPILE_FLAGS)
56 set(MPI_LINKER_FLAGS ${MPI_C_LINK_FLAGS})
57 separate_arguments(MPI_C_LINK_FLAGS)
58 include_directories(SYSTEM ${MPI_C_INCLUDE_PATH})
59 list(APPEND GMX_COMMON_LIBRARIES ${MPI_C_LIBRARIES})
61 set(MPI_FOUND ${MPI_C_FOUND})
63 # The following defaults are based on FindMPI.cmake in cmake
64 # 3.1.2. (That package does not actually do any detection of the
65 # flags, but if it ever does then we should re-visit how we use
66 # the package.) If we are compiling with an MPI wrapper
67 # compiler, then MPI_FOUND will be set above, and will mean that
68 # none of these cache variables are populated by the package. We
69 # need to do it manually so that test drivers can work using the
70 # standard machinery for CMake + FindMPI.cmake. Users will need
71 # to set these to suit their MPI setup in order for tests to
75 NAMES mpiexec mpirun lamexec srun aprun poe
76 HINTS ${MPI_HOME} $ENV{MPI_HOME}
78 DOC "Executable for running MPI programs.")
80 set(MPIEXEC_NUMPROC_FLAG "-np" CACHE STRING "Flag used by MPI to specify the number of processes for MPIEXEC; the next option will be the number of processes.")
81 set(MPIEXEC_PREFLAGS "" CACHE STRING "These flags will be directly before the executable that is being run by MPIEXEC.")
82 set(MPIEXEC_POSTFLAGS "" CACHE STRING "These flags will come after all flags given to MPIEXEC.")
83 set(MPIEXEC_MAX_NUMPROCS "2" CACHE STRING "Maximum number of processors available to run MPI applications.")
84 mark_as_advanced(MPIEXEC MPIEXEC_NUMPROC_FLAG MPIEXEC_PREFLAGS MPIEXEC_POSTFLAGS MPIEXEC_MAX_NUMPROCS)
88 include(gmxTestMPI_IN_PLACE)
90 gmx_test_mpi_in_place(MPI_IN_PLACE_EXISTS)
93 # Find path of the mpi compilers
95 get_filename_component(_mpi_c_compiler_path "${MPI_C_COMPILER}" PATH)
96 get_filename_component(_mpiexec_path "${MPIEXEC}" PATH)
98 get_filename_component(_cmake_c_compiler_path "${CMAKE_C_COMPILER}" PATH)
99 get_filename_component(_cmake_cxx_compiler_path "${CMAKE_CXX_COMPILER}" PATH)
102 # Test for and warn about unsuitable MPI versions
104 # Execute the ompi_info binary with the full path of the compiler wrapper
105 # found, otherwise we run the risk of false positives.
106 find_file(MPI_INFO_BIN ompi_info
107 HINTS ${_mpi_c_compiler_path} ${_mpiexec_path}
108 ${_cmake_c_compiler_path} ${_cmake_cxx_compiler_path}
110 NO_SYSTEM_ENVIRONMENT_PATH
111 NO_CMAKE_SYSTEM_PATH)
113 exec_program(${MPI_INFO_BIN}
115 OUTPUT_VARIABLE OPENMPI_TYPE
116 RETURN_VALUE OPENMPI_EXEC_RETURN)
117 if(OPENMPI_EXEC_RETURN EQUAL 0)
118 string(REGEX REPLACE ".*Open MPI: \([0-9]+\\.[0-9]*\\.?[0-9]*\).*" "\\1" OPENMPI_VERSION ${OPENMPI_TYPE})
119 if(OPENMPI_VERSION VERSION_LESS "1.4.1")
121 "CMake found OpenMPI version ${OPENMPI_VERSION} on your system. "
122 "There are known problems with GROMACS and OpenMPI version < 1.4.1. "
123 "Please consider updating your OpenMPI if your MPI wrapper compilers "
124 "are using the above OpenMPI version.")
126 if(OPENMPI_VERSION VERSION_EQUAL "1.8.6")
128 "CMake found OpenMPI version ${OPENMPI_VERSION} on your system. "
129 "This OpenMPI version is known to leak memory with GROMACS,"
130 "please update to a more recent version. ")
132 unset(OPENMPI_VERSION)
134 unset(OPENMPI_EXEC_RETURN)
137 unset(MPI_INFO_BIN CACHE)
139 # Execute the mpiname binary with the full path of the compiler wrapper
140 # found, otherwise we run the risk of false positives.
141 find_file(MPINAME_BIN mpiname
142 HINTS ${_mpi_c_compiler_path}
143 ${_cmake_c_compiler_path} ${_cmake_cxx_compiler_path}
145 NO_SYSTEM_ENVIRONMENT_PATH
146 NO_CMAKE_SYSTEM_PATH)
148 exec_program(${MPINAME_BIN}
150 OUTPUT_VARIABLE MVAPICH2_TYPE
151 RETURN_VALUE MVAPICH2_EXEC_RETURN)
152 if(MVAPICH2_EXEC_RETURN EQUAL 0)
153 string(REGEX MATCH "MVAPICH2" MVAPICH2_NAME ${MVAPICH2_TYPE})
154 # Want to check for MVAPICH2 in case some other library supplies mpiname
155 string(REGEX REPLACE "MVAPICH2 \([0-9]+\\.[0-9]*[a-z]?\\.?[0-9]*\)" "\\1" MVAPICH2_VERSION ${MVAPICH2_TYPE})
156 if(${MVAPICH2_NAME} STREQUAL "MVAPICH2" AND MVAPICH2_VERSION VERSION_LESS "1.5")
157 # This test works correctly even with 1.5a1
159 "CMake found MVAPICH2 version ${MVAPICH2_VERSION} on your system. "
160 "There are known problems with GROMACS and MVAPICH2 version < 1.5. "
161 "Please consider updating your MVAPICH2 if your MPI wrapper compilers "
162 "are using the above MVAPICH2 version.")
164 unset(MVAPICH2_VERSION)
167 unset(MVAPICH2_EXEC_RETURN)
170 unset(MPINAME_BIN CACHE)
173 "MPI support requested, but no MPI compiler found. Either set the "
174 "C-compiler (CMAKE_C_COMPILER) to the MPI compiler (often called mpicc), "
175 "or set the variables reported missing for MPI_C above.")