c语言mpi矩阵乘法,MPI学习笔记（三）：矩阵相乘

参考自：https://blog.youkuaiyun.com/lcx543576178/article/details/45892839

程序稍作修改，如下：

#include

using namespacestd;

#include

int main(int argc, char *argv[] ){doublestart, stop;int *a, *b, *c, *buffer, *ans;int size = 1000;intrank, numprocs, line;

MPI_Init(NULL,NULL);

MPI_Comm_rank(MPI_COMM_WORLD,&rank);

MPI_Comm_size(MPI_COMM_WORLD,&numprocs);

line= size/numprocs;

b= new int [ size *size ];

ans= new int [ size *line ];

start=MPI_Wtime();if( rank ==0){

a= new int [ size *size ];

c= new int [ size *size ];for(int i=0;i

a[ i*size + j ] = i*j;

b[ i*size + j ] = i +j;

}for(int i=1;i

MPI_Send( b, size*size, MPI_INT, i, 0, MPI_COMM_WORLD );

}for(int i=1;i

MPI_Send( a + (i-1)*line*size,