matrix_mult_slave.c

A Parallel program to multiply two matrices using Parallel Virtual Machine(PVM).Also a document to i

#include<stdio.h>
#include<pvm3.h>
#include<malloc.h>

main(){

	int rows,ncola,ncolb,mtype,mtid,stid,retcode,*a,*b,*c,nelements,i,j,k;
	FILE *fp;
	mtype = 1;
        if ((fp = fopen("matrix.log", "w")) == NULL){
                        printf("Can't Open Output File \n");
         }
	stid = pvm_mytid();
	mtid = pvm_parent();
	retcode = pvm_recv(mtid,mtype);
	retcode = pvm_upkint(&rows,1,1);
	retcode = pvm_upkint(&ncola,1,1);
	retcode = pvm_upkint(&ncolb,1,1);
	a = (int*)malloc(rows*ncola*sizeof(int));
	b = (int*)malloc(ncola*ncolb*sizeof(int));
	retcode = pvm_upkint(a,rows*ncola,1);
	retcode = pvm_upkint(b,ncola*ncolb,1);
	fprintf(fp,"rows = %d\tcola=%d\tcolb=%d",rows,ncola,ncolb);
	c = (int*)malloc(ncola*ncolb*sizeof(int));

	
	for(i = 0; i < rows; i++)
	for(j = 0; j < ncolb; j++){
		c[i * ncolb+j] = 0;
		for(k = 0; k < ncola; k++)
			c[i*ncolb+j]+=a[i*ncola+k]*b[k*ncolb+j];
	}
	

	fprintf(fp,"\n the resulting matrix in the processor %d is",stid);
	for(i = 0; i<rows;i++)
        for(j = 0; j <ncolb;j++)
       	fprintf(fp,"%d  ",c[i*ncolb+j]);
        fprintf(fp,"\n");

	

	mtype = 2;
	nelements = rows*ncolb;
	retcode = pvm_initsend(PvmDataDefault);
	retcode = pvm_pkint(&nelements,1,1);
	retcode = pvm_pkint(&c[0],nelements,1);
	retcode = pvm_send(mtid,mtype);
	pvm_exit();	

}