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35 # Manage the MPI setup, assuming that CMAKE_C_COMPILER is an MPI
39 message(STATUS "MPI is not compatible with thread-MPI. Disabling thread-MPI.")
40 set(GMX_THREAD_MPI OFF CACHE BOOL
41 "Build a thread-MPI-based multithreaded version of GROMACS (not compatible with MPI)" FORCE)
44 # Test the CMAKE_C_COMPILER for being an MPI (wrapper) compiler
45 TRY_COMPILE(MPI_FOUND ${CMAKE_BINARY_DIR}
46 "${CMAKE_SOURCE_DIR}/cmake/TestMPI.c"
49 # If CMAKE_C_COMPILER is not a MPI wrapper. Try to find MPI using cmake module as fall-back.
53 set(MPI_COMPILE_FLAGS ${MPI_C_COMPILE_FLAGS})
54 set(MPI_LINKER_FLAGS ${MPI_C_LINK_FLAGS})
55 include_directories(SYSTEM ${MPI_C_INCLUDE_PATH})
56 list(APPEND GMX_EXTRA_LIBRARIES ${MPI_C_LIBRARIES})
58 set(MPI_FOUND ${MPI_C_FOUND})
60 # The following defaults are based on FindMPI.cmake in cmake
61 # 3.1.2. (That package does not actually do any detection of the
62 # flags, but if it ever does then we should re-visit how we use
63 # the package.) If we are compiling with an MPI wrapper
64 # compiler, then MPI_FOUND will be set above, and will mean that
65 # none of these cache variables are populated by the package. We
66 # need to do it manually so that test drivers can work using the
67 # standard machinery for CMake + FindMPI.cmake. Users will need
68 # to set these to suit their MPI setup in order for tests to
72 NAMES mpiexec mpirun lamexec srun aprun poe
73 HINTS ${MPI_HOME} $ENV{MPI_HOME}
75 DOC "Executable for running MPI programs.")
77 set(MPIEXEC_NUMPROC_FLAG "-np" CACHE STRING "Flag used by MPI to specify the number of processes for MPIEXEC; the next option will be the number of processes.")
78 set(MPIEXEC_PREFLAGS "" CACHE STRING "These flags will be directly before the executable that is being run by MPIEXEC.")
79 set(MPIEXEC_POSTFLAGS "" CACHE STRING "These flags will come after all flags given to MPIEXEC.")
80 set(MPIEXEC_MAX_NUMPROCS "2" CACHE STRING "Maximum number of processors available to run MPI applications.")
81 mark_as_advanced(MPIEXEC MPIEXEC_NUMPROC_FLAG MPIEXEC_PREFLAGS MPIEXEC_POSTFLAGS MPIEXEC_MAX_NUMPROCS)
85 include(gmxTestMPI_IN_PLACE)
87 gmx_test_mpi_in_place(MPI_IN_PLACE_EXISTS)
90 # Find path of the mpi compilers
92 get_filename_component(_mpi_c_compiler_path "${MPI_C_COMPILER}" PATH)
93 get_filename_component(_mpiexec_path "${MPIEXEC}" PATH)
95 get_filename_component(_cmake_c_compiler_path "${CMAKE_C_COMPILER}" PATH)
96 get_filename_component(_cmake_cxx_compiler_path "${CMAKE_CXX_COMPILER}" PATH)
99 # Test for and warn about unsuitable MPI versions
101 # Execute the ompi_info binary with the full path of the compiler wrapper
102 # found, otherwise we run the risk of false positives.
103 find_file(MPI_INFO_BIN ompi_info
104 HINTS ${_mpi_c_compiler_path} ${_mpiexec_path}
105 ${_cmake_c_compiler_path} ${_cmake_cxx_compiler_path}
107 NO_SYSTEM_ENVIRONMENT_PATH
108 NO_CMAKE_SYSTEM_PATH)
110 exec_program(${MPI_INFO_BIN}
112 OUTPUT_VARIABLE OPENMPI_TYPE
113 RETURN_VALUE OPENMPI_EXEC_RETURN)
114 if(OPENMPI_EXEC_RETURN EQUAL 0)
115 string(REGEX REPLACE ".*Open MPI: \([0-9]+\\.[0-9]*\\.?[0-9]*\).*" "\\1" OPENMPI_VERSION ${OPENMPI_TYPE})
116 if(OPENMPI_VERSION VERSION_LESS "1.4.1")
118 "CMake found OpenMPI version ${OPENMPI_VERSION} on your system. "
119 "There are known problems with GROMACS and OpenMPI version < 1.4.1. "
120 "Please consider updating your OpenMPI if your MPI wrapper compilers "
121 "are using the above OpenMPI version.")
123 unset(OPENMPI_VERSION)
125 unset(OPENMPI_EXEC_RETURN)
128 unset(MPI_INFO_BIN CACHE)
130 # Execute the mpiname binary with the full path of the compiler wrapper
131 # found, otherwise we run the risk of false positives.
132 find_file(MPINAME_BIN mpiname
133 HINTS ${_mpi_c_compiler_path}
134 ${_cmake_c_compiler_path} ${_cmake_cxx_compiler_path}
136 NO_SYSTEM_ENVIRONMENT_PATH
137 NO_CMAKE_SYSTEM_PATH)
139 exec_program(${MPINAME_BIN}
141 OUTPUT_VARIABLE MVAPICH2_TYPE
142 RETURN_VALUE MVAPICH2_EXEC_RETURN)
143 if(MVAPICH2_EXEC_RETURN EQUAL 0)
144 string(REGEX MATCH "MVAPICH2" MVAPICH2_NAME ${MVAPICH2_TYPE})
145 # Want to check for MVAPICH2 in case some other library supplies mpiname
146 string(REGEX REPLACE "MVAPICH2 \([0-9]+\\.[0-9]*[a-z]?\\.?[0-9]*\)" "\\1" MVAPICH2_VERSION ${MVAPICH2_TYPE})
147 if(${MVAPICH2_NAME} STREQUAL "MVAPICH2" AND MVAPICH2_VERSION VERSION_LESS "1.5")
148 # This test works correctly even with 1.5a1
150 "CMake found MVAPICH2 version ${MVAPICH2_VERSION} on your system. "
151 "There are known problems with GROMACS and MVAPICH2 version < 1.5. "
152 "Please consider updating your MVAPICH2 if your MPI wrapper compilers "
153 "are using the above MVAPICH2 version.")
155 unset(MVAPICH2_VERSION)
158 unset(MVAPICH2_EXEC_RETURN)
161 unset(MPINAME_BIN CACHE)
163 # Using find_file() runs the CMake standard module
164 # GetPrerequisites.cmake, which adds the file_cmd
165 # variable to the top-level CMake namespace. This is
166 # fixed in CMake 2.8.10. Meanwhile, clean up for it.
167 if(CMAKE_VERSION VERSION_LESS "2.8.10")
168 mark_as_advanced(file_cmd)
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.")