如何将OpenMP和MPI导入到大型CLion CMake项目？
如何将OpenMP和MPI导入到大型CLion CMake项目？
提问于 2020-01-13 08:54:23
我是OpenMP和MPI的新手，我想将OpenMP和MPI导入到我现有的CMake项目中。因此--
首先，我创建了一个非常简单的MPI项目。
main.cpp：
#include "mpi.h"
#include "iostream"
int main(int argc, char** argv){
MPI_Init(NULL, NULL);
int world_size;
MPI_Comm_size(MPI_COMM_WORLD, &world_size);
int world_rank;
MPI_Comm_rank(MPI_COMM_WORLD, &world_rank);
char processor_name[MPI_MAX_PROCESSOR_NAME];
int name_len;
MPI_Get_processor_name(processor_name, &name_len);
printf("Hello world from processor %s, rank %d out of %d processors\n",processor_name, world_rank, world_size);
MPI_Finalize();
}我可以使用以下命令成功编译和运行项目：
$ mpicxx main.cpp -o main.out
$ mpirun -np 2 main.out然后，我使用CMake创建并配置了一个CLion项目。我也可以使用CLion成功地编译和运行它，但是它只使用一个处理器。
CMakeLists.txt：
cmake_minimum_required(VERSION 3.5)
project(Test)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
find_package(MPI)
include_directories(${MPI_INCLUDE_PATH})
SET(CMAKE_CXX_COMPILER mpicxx)
SET(CMAKE_C_COMPILER mpicc)
set(SOURCE_FILES main.cpp)
add_executable(Test ${SOURCE_FILES})因此，我的第一个问题是，如何使用CLion?使用多个处理器？
其次，我创建了一个简单的OpenMP项目并成功运行。
但我的第二个问题是，我如何同时包含OpenMP和MPI？似乎不能仅仅合并MPI项目和OpenMP项目的两个CMakeLists.txt。因为我得到了一个关于-fopenmp标志的错误：
clang: error: unsupported option '-fopenmp'CMakeLists.txt：
cmake_minimum_required(VERSION 3.12)
project(OpenMP_MPI)
set(CMAKE_CXX_STANDARD 14)
OPTION (USE_OpenMP "Use OpenMP to enamble <omp.h>" ON)
if(APPLE)
set(CMAKE_C_COMPILER "/usr/local/Cellar/llvm/9.0.0_1/bin/clang")
set(CMAKE_CXX_COMPILER "/usr/local/Cellar/llvm/9.0.0_1/bin/clang++")
set(OPENMP_LIBRARIES "/usr/local/Cellar/llvm/9.0.0_1/lib")
set(OPENMP_INCLUDES "/usr/local/Cellar/llvm/9.0.0_1/include")
if(CMAKE_C_COMPILER_ID MATCHES "Clang")
set(OpenMP_C "${CMAKE_C_COMPILER}")
set(OpenMP_C_FLAGS "-fopenmp=libomp -Wno-unused-command-line-argument")
set(OpenMP_C_LIB_NAMES "libomp" "libgomp" "libiomp5")
set(OpenMP_libomp_LIBRARY ${OpenMP_C_LIB_NAMES})
set(OpenMP_libgomp_LIBRARY ${OpenMP_C_LIB_NAMES})
set(OpenMP_libiomp5_LIBRARY ${OpenMP_C_LIB_NAMES})
endif()
if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
set(OpenMP_CXX "${CMAKE_CXX_COMPILER}")
set(OpenMP_CXX_FLAGS "-fopenmp=libomp -Wno-unused-command-line-argument")
set(OpenMP_CXX_LIB_NAMES "libomp" "libgomp" "libiomp5")
set(OpenMP_libomp_LIBRARY ${OpenMP_CXX_LIB_NAMES})
set(OpenMP_libgomp_LIBRARY ${OpenMP_CXX_LIB_NAMES})
set(OpenMP_libiomp5_LIBRARY ${OpenMP_CXX_LIB_NAMES})
endif()
endif()
find_package(OpenMP REQUIRED)
if (OPENMP_FOUND)
if(APPLE)
include_directories("${OPENMP_INCLUDES}")
link_directories("${OPENMP_LIBRARIES}")
endif()
set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${OpenMP_C_FLAGS}")
set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS}")
# set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${OpenMP_EXE_LINKER_FLAGS}")
endif(OPENMP_FOUND)
find_package(MPI REQUIRED)
include_directories(${MPI_INCLUDE_PATH})
SET(CMAKE_CXX_COMPILER mpicxx)
SET(CMAKE_C_COMPILER mpicc)
add_executable(OpenMP_MPI main.cpp)回答 2
Stack Overflow用户
回答已采纳
发布于 2021-08-07 08:11:10
CMakeLists.txt不应该这么复杂。应该是这样的：
cmake_minimum_required(VERSION 3.12)
project(OpenMP_MPI)
set(CMAKE_CXX_STANDARD 14)
find_package(MPI REQUIRED)
include_directories(SYSTEM ${MPI_INCLUDE_PATH})
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fopenmp")
add_executable(OpenMP_MPI main.cpp)
target_link_libraries(OpenMP_MPI ${MPI_C_LIBRARIES})对于linux，您应该使用下面的命令来构建和运行。
mkdir build && cd build && cmake .. && make && mpirun -n 2 ./OpenMP_MPI对于MacOS，只需将命令更改为
mkdir build && cd build && cmake -DCMAKE_CXX_COMPILER=g++-9 .. && make && mpirun -n 2 ./OpenMP_MPI应该管用的。(您可以转到/usr/local/bin检查编译器是否为g++-9。)
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/59713236
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