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cross.c
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cross.c
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/*******************************************************************
* Filename: cross.c
*
* Description: N(=9) processes compute Jacobi method of
* A (9*9) for M(=1) times.
* Simplified from a application.
* Version: 1.0
* Created: 03/31/2012 08:34:45 PM
* Revision: none
* Compiler: gcc
*
* Author: Hu Yong
* Email: huyong1109@gmail.com
* Company: HPC tsinghua
*
*******************************************************************/
#include<stdio.h>
#include<stdlib.h>
#include"mpi.h"
#define SUB_SIZE 3
#define N_PROCESS 9
#define CHANGEDIM(AA,xx,yy) *((double*)(AA)+(SUB_SIZE+2)*(xx)+(yy))
/* Cross
* passing massage to up, down, left ,right
* */
int Cross(double **A, int myid,int subsize,int np,MPI_Status *status ){
int left, right,up, down;
if (myid /3 == 0)
up = MPI_PROC_NULL;
else
up = myid -3;
if (myid /3 == 2)
down = MPI_PROC_NULL;
else
down = myid +3;
if (myid %3 == 0)
left = MPI_PROC_NULL;
else
left = myid -1;
if (myid %3 == 2)
right = MPI_PROC_NULL;
else
right = myid +1;
/* send massage to up proc and receive from down proc */
int i,j;
MPI_Barrier(MPI_COMM_WORLD);
if(myid ==0 )
printf("Send massage to up and Recv from down\n");
MPI_Sendrecv(&CHANGEDIM(A,1,1),subsize,MPI_DOUBLE,up,1,&CHANGEDIM(A,subsize+1,1),subsize,MPI_DOUBLE,down,1,MPI_COMM_WORLD,status);
if(up != MPI_PROC_NULL){
printf(" proc %d send [",myid);
for (i =0;i<subsize; i++){
printf("%f\t",CHANGEDIM(A,1,i+1));}
printf("] to %d\n",up);}
if(down != MPI_PROC_NULL ){
printf(" proc %d get [",myid);
for (i =0;i<subsize; i++){
printf("%f\t",CHANGEDIM(A,subsize+1,i+1));}
printf("] from %d\n",down);}
/* send massage to down proc and receive from up proc */
MPI_Barrier(MPI_COMM_WORLD);
if(myid ==0 )
printf("Send massage to down and Recv from up\n");
MPI_Sendrecv(&CHANGEDIM(A,subsize,1),subsize,MPI_DOUBLE,down,2,&CHANGEDIM(A,0,1),subsize,MPI_DOUBLE,up,2,MPI_COMM_WORLD,status);
if(down != MPI_PROC_NULL){
printf(" proc %d send [",myid);
for (i =0;i<subsize; i++){
printf("%f\t",CHANGEDIM(A,subsize,i+1));}
printf("] to %d\n",down);}
if(up != MPI_PROC_NULL ){
printf(" proc %d get [",myid);
for (i =0;i<subsize; i++){
printf("%f\t",CHANGEDIM(A,0,i+1));}
printf("] from %d\n",up);}
/* send massage to left proc and receive from right proc */
MPI_Datatype A_COL;
MPI_Type_vector(subsize,1,subsize+2,MPI_DOUBLE,&A_COL);
MPI_Type_commit(&A_COL);
MPI_Barrier(MPI_COMM_WORLD);
if(myid ==0 )
printf("Send massage to left and Recv from right\n");
MPI_Sendrecv(&CHANGEDIM(A,1,1),1,A_COL,left,3,&CHANGEDIM(A,1,subsize+1),1,A_COL,right,3,MPI_COMM_WORLD,status);
if(left != MPI_PROC_NULL){
printf(" proc %d send [",myid);
for (i =0;i<subsize; i++){
printf("%f\t",CHANGEDIM(A,i+1,1));}
printf("] to %d\n",left);}
if(right != MPI_PROC_NULL ){
printf(" proc %d get [",myid);
for (i =0;i<subsize; i++){
printf("%f\t",CHANGEDIM(A,i+1,subsize+1));}
printf("] from %d\n",right);}
/* send massage to down proc and receive from up proc */
MPI_Barrier(MPI_COMM_WORLD);
if(myid ==0 )
printf("Send massage to left and Recv from right\n");
MPI_Sendrecv(&CHANGEDIM(A,1,subsize),1,A_COL,right,4,&CHANGEDIM(A,1,0),1,A_COL,left,4,MPI_COMM_WORLD,status);
if(right != MPI_PROC_NULL){
printf(" proc %d send [",myid);
for (i =0;i<subsize; i++){
printf("%f\t",CHANGEDIM(A,i+1,subsize));}
printf("] to %d\n",right);}
if(left != MPI_PROC_NULL ){
printf(" proc %d get [",myid);
for (i =0;i<subsize; i++){
printf("%f\t",CHANGEDIM(A,i+1,0));}
printf("] from %d\n",left);}
return 0;
}
/* Jacobi processing
* A[i][j]= 0.25(A[i-1][j]+A[i+1][j]+A[i][j+1]+A[i][j-1])
* */
int Jacobi(double **A, int myid,int subsize,int np){
int i,j;
double B[subsize][subsize];
for(i=1;i<subsize+1;i++)
for(j=1;j<subsize+1;j++)
{
B[i-1][j-1]=0.25*(CHANGEDIM(A,i-1,j)+ CHANGEDIM(A,i+1,j)+CHANGEDIM(A,i,j+1)+CHANGEDIM(A,i,j-1));
}
for(i=1;i<subsize+1;i++){
for(j=1;j<subsize+1;j++){
CHANGEDIM(A,i,j)=B[i-1][j-1];}}
return 0;
}
/* CrossShow
* print the value of each sub matrix, with extra side numbers
* */
int CrossShow(double **A, int myid,int subsize)
{
int i,j,k;
printf("Value in proc %d\n",myid);
for(j=0;j<subsize+2;j++){
for(k=0;k<subsize+2;k++)
printf("%1.3f\t",CHANGEDIM(A,j,k));
printf("\n\n");}
return 0;
}
/* main function
* */
int main(int argc, char **argv)
{
int subsize = SUB_SIZE;
double A[subsize+2][subsize+2];
int count, tag, myid,np, i,j,k;
MPI_Status status;
MPI_Init(&argc,&argv);
MPI_Comm_rank(MPI_COMM_WORLD,&myid);
MPI_Comm_size(MPI_COMM_WORLD,&np);
/* check processes */
if(np < N_PROCESS){
printf("!!!%d processes is needed!!!\n",N_PROCESS );
return -1;
}
/* set initiate ,all get 0.0 */
for(i=0;i<subsize+2;i++)
for(j=0;j<subsize+2;j++)
A[i][j]= 0.0;
/* set four sides element to 8.0 */
for(i =0;i<3;i++){
if(myid == i){
for(j=1;j<subsize+1;j++)
A[1][j]= 8.0;
}
}
for(i =6;i<9;i++){
if(myid == i){
for(j=1;j<subsize+1;j++)
A[subsize][j]= 8.0;
}
}
for(i =0;i<9;i=i+3){
if(myid == i){
for(j=1;j<subsize+1;j++)
A[j][1]= 8.0;}
}
for(i =2;i<9;i=i+3){
if(myid == i){
for(j=1;j<subsize+1;j++)
A[j][subsize]= 8.0;}
}
if (myid ==0){
printf("----------Initiate Matrix --------\n");}
for(i =0;i<9;i++){
if(myid ==i ){
CrossShow(A,myid,subsize);}
MPI_Barrier(MPI_COMM_WORLD);
}
MPI_Barrier(MPI_COMM_WORLD);
if (myid ==0){
printf("----------Passing massage -----begin---\n");}
Cross(A,myid, subsize,np,&status);
MPI_Barrier(MPI_COMM_WORLD);
if (myid ==0){
printf("----------Passing massage -----end---\n");
printf("----------Matrix show after Passage --------\n");}
for(i =0;i<9;i++){
if(myid ==i ){
CrossShow(A,myid,subsize);}
MPI_Barrier(MPI_COMM_WORLD);
}
Jacobi(A, myid, subsize,np);
MPI_Barrier(MPI_COMM_WORLD);
if (myid ==0){
printf("----------Matrix show after Jacobi --------\n");}
for(i =0;i<9;i++){
if(myid ==i ){
CrossShow(A,myid,subsize);}
MPI_Barrier(MPI_COMM_WORLD);
}
MPI_Finalize();
return 0;
}