install
wget https://www.mpich.org/static/downloads/4.1/mpich-4.1.tar.gzfrom https://www.mpich.org/static/downloadstar -zxvf mpich-4.1.tar.gzcd mpich-4.1/
(base) :~/MPI/mpich-4.1$ ls
aclocal.m4 CHANGES config.log config.status configure contrib COPYRIGHT examples libtool Makefile Makefile.in modules mpich-doxygen.in README.envvar src test
autogen.sh confdb config.lt config.system configure.ac CONTRIBUTING doc lib maint Makefile.am man mpich-doxygen README RELEASE_NOTES subsys_include.m4 www
-
./configure --prefix=/usr/local/mpich-4.1设置安装路径 -
make j4 -
sudo make install -
vim ~/.bashrc -
export PATH="/usr/local/mpich-4.1/bin:$PATH" -
source ~/.bashrc -
which mpicc,whereis mpif90
use
//cmake_minimum_required(VERSION 3.15)
//
//#set(CMAKE_CXX_STANDARD 11)
//
//find_package(MPI REQUIRED)
//include_directories(${MPI_INCLUDE_PATH})
//SET(CMAKE_CXX_COMPILER mpicxx)
//SET(CMAKE_C_COMPILER mpicc)
//
//add_executable(hello main.cpp)
#include <stdio.h>
#include "mpi.h"
int main(int argc, char *argv[])
{
int rank;
int size;
MPI_Init(0,0);// MPI_Init(&argc,&argv);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
MPI_Comm_size(MPI_COMM_WORLD, &size);
printf("Hello world from process %d of %d\n", rank, size);
MPI_Finalize();
return 0;
}
run result
1.clion setting(not working in my env)
-
/usr/local/mpich-4.1/bin/mpirun -
but output only this :
Hello world from process 0 of 1
[Clion 可以编译调用 MPI 并行库的项目么？
在 Ubuntu 上尝试用 cmake 和 Clion 编译一个项目，需要调用 MPI 并行计算。
也就是编译时候编译器使用 mpicc，程序运行参数为 mpirun -n 4 ./XXX 形式。
可以通过直接修改 cmake 实现么？](https://www.zhihu.com/question/40910086?utm_id=0)
clion 运行 MPI
https://blog.csdn.net/qq_34149581/article/details/88359766
Clion运行MPI程序还是很简单的，主要问题还是调试，MPI程序一直很难调试。上面的方案只能写代码+运行，目前调试还做不到。
2. run in terminal
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~/MPI/hello$ mpicc -o hellow main.cpplike gcc -
~/MPI/hello$ ls
cmake-build-debug CMakeLists.txt hellow main.cpp
~/MPI/hello$ ./hellow
Hello world from process 0 of 1
~/MPI/hello$ mpirun -np 4 ./hellow
Hello world from process 0 of 4
Hello world from process 1 of 4
Hello world from process 3 of 4
Hello world from process 2 of 4
commuation
#include <stdio.h>
#include "mpi.h"
#include <cstring>
int main(int argc, char *argv[])
{
int m_rank;
int m_size;
MPI_Init(0,0);
MPI_Comm_rank(MPI_COMM_WORLD, &m_rank);
MPI_Comm_size(MPI_COMM_WORLD, &m_size);
//printf("Hello world from process %d of %d\n", m_rank, m_size);
char greeting[10]="hello,wor";
if (m_size > 1)
{
if (m_rank == 0)
{
/* 从0进程向其他进程发送数据 */
for (int rank = 1; rank < m_size; rank++)
{
//printf(greeting, "Greeting from process %d to %d of %d", m_rank, rank, m_size);
printf("%d",100);
//sleep(1);
MPI_Send(greeting, strlen(greeting)+1, MPI_CHAR, rank, 0, MPI_COMM_WORLD);
}
}
else
{
/* 其他进程从0进程接收数据 */
MPI_Recv(greeting, 10, MPI_CHAR, 0, 0, MPI_COMM_WORLD, MPI_STATUSES_IGNORE);
}
}
MPI_Finalize();
return 0;
}// https://zhuanlan.zhihu.com/p/455102835
定积分 π \pi π
#include "mpi.h"
#include <stdio.h>
double f(double);
double f(double x)
{
return (4.0/(1.0+x*x));
}
int main(int argc,char *argv[])
{
int myid, numprocs;
int n, i;
double mypi, pi;
double h, sum, x;
MPI_Init(&argc,&argv); //todo begin 必要定义
MPI_Comm_size(MPI_COMM_WORLD,&numprocs);// 获得总进程数
MPI_Comm_rank(MPI_COMM_WORLD,&myid);// 获得进程号
printf("Process %d of %d.\n", myid, numprocs);
n = 100;
h = 1.0 / (double) n;
sum = 0.0;
for (i = myid + 1; i <= n; i += numprocs)
{
x = h * ((double)i - 0.5);
sum +=f(x);
}
mypi = h * sum;
// 我们可以选择使用上一章提到的MPI_SEND和MPI_RECV函数，但这在实现起来会很复杂。在这里，我们可以考虑使用规约操作。
// 该函数可以理解为在通信域MPI_COMM_WORLD中，将各个进程的MPI_DOUBLE型变量起始地址为&mypi长度为1发送到缓冲区，并执行MPI_SUM操作，
// 将结果返回至0进程的&pi地址中。用直白的话讲就是将域内每一个进程的mypi相加求和，并将所得的结果存入0进程中的pi变量。规约函数中有很多操作，比如求和、求积、取最大值、取最小值等等，具体可以查阅手册，这一函数会使得我们的并行程序编写变得很方便。
MPI_Reduce(&mypi, &pi, 1, MPI_DOUBLE, MPI_SUM, 0, MPI_COMM_WORLD);// 规约操作
if (myid == 0)
{
printf("The result is %.10f.\n",pi);
}
MPI_Finalize();//todo end 必要定义
}
//mpicc -o hellow main.cpp
//mpirun -np 50 ./hellow
-
int MPI_Send(type* buf, int count, MPI_Datatype, int dest, int tag, MPI_Comm comm) -
int MPI_Recv(type* buf, int count, MPI_Datatype, int source, int tag, MPI_Comm comm, MPI_Status *status)