1. 首先进行MPI的安装，将MPI安装到/usr/local/mpich中，可参考其他博客的安装。
2. 然后更改clion的cmakelist.txt文件：
cmake_minimum_required(VERSION 3.13)
project(eigen)
find_package(MPI REQUIRED)
include_directories(${MPI_INCLUDE_PATH})
SET(CMAKE_CXX_COMPILER mpicxx)
SET(CMAKE_C_COMPILER mpicc)
add_executable(mpi_spmv mpi_spmv.cpp)
将要运行的文件，加入到add_executable中，我设置编译后的名称为mpi_spmv（名称可自行设置）
3. 修改clion的运行配置：
将Executable切换到本地的mpirun所在路径，路径为/usr/bin/mpirun
Working directory切换到工程所在的目录。
4. 尝试运行mpi_spmv.cpp文件：
#include "mpi_hello.h"
#include "cstdio"
#include "cstring"
#include "mpi.h"
const int MAX_STRING = 100;
int main() {
char greeting[MAX_STRING];
int comm_sz;
int my_rank;
MPI_Init(NULL, NULL);
MPI_Comm_size(MPI_COMM_WORLD, &comm_sz);
MPI_Comm_rank(MPI_COMM_WORLD, &my_rank);
if (my_rank != 0) {
sprintf(greeting, "Greeting from process %d of %d!", my_rank, comm_sz);
MPI_Send(greeting, strlen(greeting) + 1, MPI_CHAR, 0, 0, MPI_COMM_WORLD);
} else {
printf("Greetings from process %d of %d!\n", my_rank, comm_sz);
for (int q = 1; q < comm_sz; ++q) {
MPI_Recv(greeting, MAX_STRING, MPI_CHAR, q, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
printf("%s\n", greeting);
}
}
MPI_Finalize();
return 0;
}运行结果为：
/usr/bin/mpirun -np 4 ./mpi_spmv
Greetings from process 0 of 4!
Greeting from process 1 of 4!
Greeting from process 2 of 4!
Greeting from process 3 of 4!
Process finished with exit code 0