如何将 OpenMP 和 MPI 导入到大型 CLion CMake 项目中?

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。

主.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 processorsn",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 CLion 创建并配置了一个 CMake 项目。我也可以使用CLion成功编译和运行它，但它只使用了一个处理器。

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怎样才能同时包含 MPI 和 OpenMP？看来我不能只合并MPI项目和OpenMP项目的两个CMakeLists.txt。因为我收到有关-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)