1 # - Message Passing Interface (MPI) module.
3 # The Message Passing Interface (MPI) is a library used to write
4 # high-performance parallel applications that use message passing, and
5 # is typically deployed on a cluster. MPI is a standard interface
6 # (defined by the MPI forum) for which many implementations are
7 # available. All of these implementations have somewhat different
8 # compilation approaches (different include paths, libraries to link
9 # against, etc.), and this module tries to smooth out those differences.
11 # This module will set the following variables:
12 # MPI_FOUND TRUE if we have found MPI
13 # MPI_COMPILE_FLAGS Compilation flags for MPI programs
14 # MPI_INCLUDE_PATH Include path(s) for MPI header
15 # MPI_LINK_FLAGS Linking flags for MPI programs
16 # MPI_LIBRARY First MPI library to link against (cached)
17 # MPI_EXTRA_LIBRARY Extra MPI libraries to link against (cached)
18 # MPI_LIBRARIES All libraries to link MPI programs against
19 # MPIEXEC Executable for running MPI programs
20 # MPIEXEC_NUMPROC_FLAG Flag to pass to MPIEXEC before giving it the
21 # number of processors to run on
22 # MPIEXEC_PREFLAGS Flags to pass to MPIEXEC directly before the
24 # MPIEXEC_POSTFLAGS Flags to pass to MPIEXEC after all other flags.
26 # This module will attempt to auto-detect these settings, first by
27 # looking for a MPI compiler, which many MPI implementations provide
28 # as a pass-through to the native compiler to simplify the compilation
29 # of MPI programs. The MPI compiler is stored in the cache variable
30 # MPI_COMPILER, and will attempt to look for commonly-named drivers
31 # mpic++, mpicxx, mpiCC, or mpicc. If the compiler driver is found and
32 # recognized, it will be used to set all of the module variables. To
33 # skip this auto-detection, set MPI_LIBRARY and MPI_INCLUDE_PATH in
36 # If no compiler driver is found or the compiler driver is not
37 # recognized, this module will then search for common include paths
38 # and library names to try to detect MPI.
40 # If CMake initially finds a different MPI than was intended, and you
41 # want to use the MPI compiler auto-detection for a different MPI
42 # implementation, set MPI_COMPILER to the MPI compiler driver you want
43 # to use (e.g., mpicxx) and then set MPI_LIBRARY to the string
44 # MPI_LIBRARY-NOTFOUND. When you re-configure, auto-detection of MPI
45 # will run again with the newly-specified MPI_COMPILER.
47 # When using MPIEXEC to execute MPI applications, you should typically
48 # use all of the MPIEXEC flags as follows:
49 # ${MPIEXEC} ${MPIEXEC_NUMPROC_FLAG} PROCS ${MPIEXEC_PREFLAGS} EXECUTABLE
50 # ${MPIEXEC_POSTFLAGS} ARGS
51 # where PROCS is the number of processors on which to execute the program,
52 # EXECUTABLE is the MPI program, and ARGS are the arguments to pass to the
55 #=============================================================================
56 # Copyright 2001-2009 Kitware, Inc.
58 # Distributed under the OSI-approved BSD License (the "License");
59 # see accompanying file Copyright.txt for details.
61 # This software is distributed WITHOUT ANY WARRANTY; without even the
62 # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
63 # See the License for more information.
64 #=============================================================================
65 # (To distributed this file outside of CMake, substitute the full
66 # License text for the above reference.)
68 # This module is maintained by David Partyka <dave.partyka@kitware.com>.
70 # A set of directories to search through in addition to the standard system paths
71 # that find_program will search through.
72 # Microsoft HPC SDK is automatically added to the system path
73 # Argonne National Labs MPICH2 sets a registry key that we can use.
75 TRY_COMPILE(MPI_FOUND ${CMAKE_BINARY_DIR}
76 "${CMAKE_SOURCE_DIR}/cmake/TestMPI.c"
91 "Microsoft Compute Cluster Pack"
96 list(APPEND _MPI_PREFIX_PATH "[HKEY_LOCAL_MACHINE\\SOFTWARE\\MPICH\\SMPD;binary]/..")
97 list(APPEND _MPI_PREFIX_PATH "[HKEY_LOCAL_MACHINE\\SOFTWARE\\MPICH2;Path]")
100 foreach(SystemPrefixDir ${CMAKE_SYSTEM_PREFIX_PATH})
101 foreach(MpiPackageDir ${_MPI_PREFIX_PATH})
102 if(EXISTS ${SystemPrefixDir}/${MpiPackageDir})
103 list(APPEND _MPI_PREFIX_PATH "${SystemPrefixDir}/${MpiPackageDir}")
105 endforeach(MpiPackageDir)
106 endforeach(SystemPrefixDir)
108 # Most mpi distros have some form of mpiexec which gives us something we can reliably look for.
110 NAMES mpiexec mpirun lamexec
111 PATHS ${_MPI_PREFIX_PATH}
113 DOC "Executable for running MPI programs."
116 # call get_filename_component twice to remove mpiexec and the directory it exists in (typically bin).
117 # This gives us a fairly reliable base directory to search for /bin /lib and /include from.
118 get_filename_component(_MPI_BASE_DIR "${MPIEXEC}" PATH)
119 get_filename_component(_MPI_BASE_DIR "${_MPI_BASE_DIR}" PATH)
121 # If there is an mpi compiler find it and interogate (farther below) it for the include
122 # and lib dirs otherwise we will continue to search from ${_MPI_BASE_DIR}.
123 find_program(MPI_COMPILER
124 NAMES mpic++ mpicxx mpiCC mpicc
125 HINTS "${_MPI_BASE_DIR}"
127 DOC "MPI compiler. Used only to detect MPI compilation flags.")
128 mark_as_advanced(MPI_COMPILER)
130 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.")
131 set(MPIEXEC_PREFLAGS "" CACHE STRING "These flags will be directly before the executable that is being run by MPIEXEC.")
132 set(MPIEXEC_POSTFLAGS "" CACHE STRING "These flags will come after all flags given to MPIEXEC.")
133 set(MPIEXEC_MAX_NUMPROCS "2" CACHE STRING "Maximum number of processors available to run MPI applications.")
134 mark_as_advanced(MPIEXEC MPIEXEC_NUMPROC_FLAG MPIEXEC_PREFLAGS
135 MPIEXEC_POSTFLAGS MPIEXEC_MAX_NUMPROCS)
137 if (MPI_INCLUDE_PATH AND MPI_LIBRARY)
138 # Do nothing: we already have MPI_INCLUDE_PATH and MPI_LIBRARY in
139 # the cache, and we don't want to override those settings.
140 elseif (MPI_COMPILER)
141 # Check whether the -showme:compile option works. This indicates
142 # that we have either Open MPI or a newer version of LAM-MPI, and
143 # implies that -showme:link will also work.
144 # Note that Windows distros do not have an mpi compiler to interogate.
145 exec_program(${MPI_COMPILER}
147 OUTPUT_VARIABLE MPI_COMPILE_CMDLINE
148 RETURN_VALUE MPI_COMPILER_RETURN)
150 if (MPI_COMPILER_RETURN EQUAL 0)
151 # If we appear to have -showme:compile, then we should also have
152 # -showme:link. Try it.
153 exec_program(${MPI_COMPILER}
155 OUTPUT_VARIABLE MPI_LINK_CMDLINE
156 RETURN_VALUE MPI_COMPILER_RETURN)
158 # Note that we probably have -showme:incdirs and -showme:libdirs
160 set(MPI_COMPILER_MAY_HAVE_INCLIBDIRS TRUE)
161 endif (MPI_COMPILER_RETURN EQUAL 0)
163 if (MPI_COMPILER_RETURN EQUAL 0)
164 # Do nothing: we have our command lines now
165 else (MPI_COMPILER_RETURN EQUAL 0)
166 # Older versions of LAM-MPI have "-showme". Try it.
167 exec_program(${MPI_COMPILER}
169 OUTPUT_VARIABLE MPI_COMPILE_CMDLINE
170 RETURN_VALUE MPI_COMPILER_RETURN)
171 endif (MPI_COMPILER_RETURN EQUAL 0)
173 if (MPI_COMPILER_RETURN EQUAL 0)
174 # Do nothing: we have our command lines now
175 else (MPI_COMPILER_RETURN EQUAL 0)
176 # MPICH uses "-show". Try it.
177 exec_program(${MPI_COMPILER}
179 OUTPUT_VARIABLE MPI_COMPILE_CMDLINE
180 RETURN_VALUE MPI_COMPILER_RETURN)
181 endif (MPI_COMPILER_RETURN EQUAL 0)
183 if (MPI_COMPILER_RETURN EQUAL 0)
184 # We have our command lines, but we might need to copy
185 # MPI_COMPILE_CMDLINE into MPI_LINK_CMDLINE, if the underlying
186 if (NOT MPI_LINK_CMDLINE)
187 SET(MPI_LINK_CMDLINE ${MPI_COMPILE_CMDLINE})
188 endif (NOT MPI_LINK_CMDLINE)
189 else (MPI_COMPILER_RETURN EQUAL 0)
190 message(STATUS "Unable to determine MPI from MPI driver ${MPI_COMPILER}")
191 endif (MPI_COMPILER_RETURN EQUAL 0)
192 endif (MPI_INCLUDE_PATH AND MPI_LIBRARY)
194 if (MPI_INCLUDE_PATH AND MPI_LIBRARY)
195 # Do nothing: we already have MPI_INCLUDE_PATH and MPI_LIBRARY in
196 # the cache, and we don't want to override those settings.
197 elseif (MPI_COMPILE_CMDLINE)
198 # Extract compile flags from the compile command line.
199 string(REGEX MATCHALL "-D([^\" ]+|\"[^\"]+\")" MPI_ALL_COMPILE_FLAGS "${MPI_COMPILE_CMDLINE}")
200 set(MPI_COMPILE_FLAGS_WORK)
201 foreach(FLAG ${MPI_ALL_COMPILE_FLAGS})
202 if (MPI_COMPILE_FLAGS_WORK)
203 set(MPI_COMPILE_FLAGS_WORK "${MPI_COMPILE_FLAGS_WORK} ${FLAG}")
204 else(MPI_COMPILE_FLAGS_WORK)
205 set(MPI_COMPILE_FLAGS_WORK ${FLAG})
206 endif(MPI_COMPILE_FLAGS_WORK)
209 # Extract include paths from compile command line
210 string(REGEX MATCHALL "-I([^\" ]+|\"[^\"]+\")" MPI_ALL_INCLUDE_PATHS "${MPI_COMPILE_CMDLINE}")
211 set(MPI_INCLUDE_PATH_WORK)
212 foreach(IPATH ${MPI_ALL_INCLUDE_PATHS})
213 string(REGEX REPLACE "^-I" "" IPATH ${IPATH})
214 string(REGEX REPLACE "//" "/" IPATH ${IPATH})
215 list(APPEND MPI_INCLUDE_PATH_WORK ${IPATH})
218 if (NOT MPI_INCLUDE_PATH_WORK)
219 if (MPI_COMPILER_MAY_HAVE_INCLIBDIRS)
220 # The compile command line didn't have any include paths on it,
221 # but we may have -showme:incdirs. Use it.
222 exec_program(${MPI_COMPILER}
224 OUTPUT_VARIABLE MPI_INCLUDE_PATH_WORK
225 RETURN_VALUE MPI_COMPILER_RETURN)
226 separate_arguments(MPI_INCLUDE_PATH_WORK)
227 endif (MPI_COMPILER_MAY_HAVE_INCLIBDIRS)
228 endif (NOT MPI_INCLUDE_PATH_WORK)
230 if (NOT MPI_INCLUDE_PATH_WORK)
231 # If all else fails, just search for mpi.h in the normal include
233 find_path(MPI_INCLUDE_PATH mpi.h
234 HINTS ${_MPI_BASE_DIR} ${_MPI_PREFIX_PATH}
235 PATH_SUFFIXES include
237 set(MPI_INCLUDE_PATH_WORK ${MPI_INCLUDE_PATH})
238 endif (NOT MPI_INCLUDE_PATH_WORK)
240 # Extract linker paths from the link command line
241 string(REGEX MATCHALL "-L([^\" ]+|\"[^\"]+\")" MPI_ALL_LINK_PATHS "${MPI_LINK_CMDLINE}")
243 foreach(LPATH ${MPI_ALL_LINK_PATHS})
244 string(REGEX REPLACE "^-L" "" LPATH ${LPATH})
245 string(REGEX REPLACE "//" "/" LPATH ${LPATH})
246 list(APPEND MPI_LINK_PATH ${LPATH})
249 if (NOT MPI_LINK_PATH)
250 if (MPI_COMPILER_MAY_HAVE_INCLIBDIRS)
251 # The compile command line didn't have any linking paths on it,
252 # but we may have -showme:libdirs. Use it.
253 exec_program(${MPI_COMPILER}
255 OUTPUT_VARIABLE MPI_LINK_PATH
256 RETURN_VALUE MPI_COMPILER_RETURN)
257 separate_arguments(MPI_LINK_PATH)
258 endif (MPI_COMPILER_MAY_HAVE_INCLIBDIRS)
259 endif (NOT MPI_LINK_PATH)
261 # Extract linker flags from the link command line
262 string(REGEX MATCHALL "-Wl,([^\" ]+|\"[^\"]+\")" MPI_ALL_LINK_FLAGS "${MPI_LINK_CMDLINE}")
263 set(MPI_LINK_FLAGS_WORK)
264 foreach(FLAG ${MPI_ALL_LINK_FLAGS})
265 if (MPI_LINK_FLAGS_WORK)
266 set(MPI_LINK_FLAGS_WORK "${MPI_LINK_FLAGS_WORK} ${FLAG}")
267 else(MPI_LINK_FLAGS_WORK)
268 set(MPI_LINK_FLAGS_WORK ${FLAG})
269 endif(MPI_LINK_FLAGS_WORK)
272 # Extract the set of libraries to link against from the link command
274 string(REGEX MATCHALL "-l([^\" ]+|\"[^\"]+\")" MPI_LIBNAMES "${MPI_LINK_CMDLINE}")
276 # Determine full path names for all of the libraries that one needs
277 # to link against in an MPI program
279 foreach(LIB ${MPI_LIBNAMES})
280 string(REGEX REPLACE "^-l" "" LIB ${LIB})
281 set(MPI_LIB "MPI_LIB-NOTFOUND" CACHE FILEPATH "Cleared" FORCE)
282 find_library(MPI_LIB ${LIB} HINTS ${MPI_LINK_PATH})
284 list(APPEND MPI_LIBRARIES ${MPI_LIB})
286 message(SEND_ERROR "Unable to find MPI library ${LIB}")
289 set(MPI_LIB "MPI_LIB-NOTFOUND" CACHE INTERNAL "Scratch variable for MPI detection" FORCE)
291 # Chop MPI_LIBRARIES into the old-style MPI_LIBRARY and
293 list(LENGTH MPI_LIBRARIES MPI_NUMLIBS)
294 list(LENGTH MPI_LIBNAMES MPI_NUMLIBS_EXPECTED)
295 if (MPI_NUMLIBS EQUAL MPI_NUMLIBS_EXPECTED)
296 list(GET MPI_LIBRARIES 0 MPI_LIBRARY_WORK)
297 set(MPI_LIBRARY ${MPI_LIBRARY_WORK} CACHE FILEPATH "MPI library to link against" FORCE)
298 else (MPI_NUMLIBS EQUAL MPI_NUMLIBS_EXPECTED)
299 set(MPI_LIBRARY "MPI_LIBRARY-NOTFOUND" CACHE FILEPATH "MPI library to link against" FORCE)
300 endif (MPI_NUMLIBS EQUAL MPI_NUMLIBS_EXPECTED)
301 if (MPI_NUMLIBS GREATER 1)
302 set(MPI_EXTRA_LIBRARY_WORK ${MPI_LIBRARIES})
303 list(REMOVE_AT MPI_EXTRA_LIBRARY_WORK 0)
304 set(MPI_EXTRA_LIBRARY ${MPI_EXTRA_LIBRARY_WORK} CACHE STRING "Extra MPI libraries to link against" FORCE)
305 else (MPI_NUMLIBS GREATER 1)
306 set(MPI_EXTRA_LIBRARY "MPI_EXTRA_LIBRARY-NOTFOUND" CACHE STRING "Extra MPI libraries to link against" FORCE)
307 endif (MPI_NUMLIBS GREATER 1)
309 # Set up all of the appropriate cache entries
310 set(MPI_COMPILE_FLAGS ${MPI_COMPILE_FLAGS_WORK} CACHE STRING "MPI compilation flags" FORCE)
311 set(MPI_INCLUDE_PATH ${MPI_INCLUDE_PATH_WORK} CACHE STRING "MPI include path" FORCE)
312 set(MPI_LINK_FLAGS ${MPI_LINK_FLAGS_WORK} CACHE STRING "MPI linking flags" FORCE)
313 else (MPI_COMPILE_CMDLINE)
314 # No MPI compiler to interogate so attempt to find everything with find functions.
315 find_path(MPI_INCLUDE_PATH mpi.h
316 HINTS ${_MPI_BASE_DIR} ${_MPI_PREFIX_PATH}
317 PATH_SUFFIXES include
320 # Decide between 32-bit and 64-bit libraries for Microsoft's MPI
321 if("${CMAKE_SIZEOF_VOID_P}" EQUAL 8)
322 set(MS_MPI_ARCH_DIR amd64)
324 set(MS_MPI_ARCH_DIR i386)
327 find_library(MPI_LIBRARY
328 NAMES mpi mpich msmpi
329 HINTS ${_MPI_BASE_DIR} ${_MPI_PREFIX_PATH}
330 PATH_SUFFIXES lib lib/${MS_MPI_ARCH_DIR} Lib Lib/${MS_MPI_ARCH_DIR}
333 find_library(MPI_EXTRA_LIBRARY
335 HINTS ${_MPI_BASE_DIR} ${_MPI_PREFIX_PATH}
337 DOC "Extra MPI libraries to link against.")
339 set(MPI_COMPILE_FLAGS "" CACHE STRING "MPI compilation flags")
340 set(MPI_LINK_FLAGS "" CACHE STRING "MPI linking flags")
341 endif (MPI_INCLUDE_PATH AND MPI_LIBRARY)
343 # on BlueGene/L the MPI lib is named libmpich.rts.a, there also these additional libs are required
344 if("${MPI_LIBRARY}" MATCHES "mpich.rts")
345 set(MPI_EXTRA_LIBRARY ${MPI_EXTRA_LIBRARY} msglayer.rts devices.rts rts.rts devices.rts)
346 set(MPI_LIBRARY ${MPI_LIBRARY} msglayer.rts devices.rts rts.rts devices.rts)
347 endif("${MPI_LIBRARY}" MATCHES "mpich.rts")
349 # Set up extra variables to conform to
350 if (MPI_EXTRA_LIBRARY)
351 set(MPI_LIBRARIES ${MPI_LIBRARY} ${MPI_EXTRA_LIBRARY})
352 else (MPI_EXTRA_LIBRARY)
353 set(MPI_LIBRARIES ${MPI_LIBRARY})
354 endif (MPI_EXTRA_LIBRARY)
356 if (MPI_INCLUDE_PATH AND MPI_LIBRARY)
358 else (MPI_INCLUDE_PATH AND MPI_LIBRARY)
360 endif (MPI_INCLUDE_PATH AND MPI_LIBRARY)
362 include(FindPackageHandleStandardArgs)
363 # handle the QUIETLY and REQUIRED arguments
364 find_package_handle_standard_args(MPI DEFAULT_MSG MPI_LIBRARY MPI_INCLUDE_PATH)
366 mark_as_advanced(MPI_INCLUDE_PATH MPI_COMPILE_FLAGS MPI_LINK_FLAGS MPI_LIBRARY
369 # unset to cleanup namespace
370 unset(_MPI_PACKAGE_DIR)
371 unset(_MPI_PREFIX_PATH)