c - Trying to run MPI Matrix Multiplication Example -

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i'm trying run code found online understand mpi better i'm thrown error when try compile following code.

i returned following:

$ mpicc -o mpimm mpimm.c mpimm.c: in function ‘main’: mpimm.c:10: error: storage size of ‘start’ isn’t known mpimm.c:10: error: storage size of ‘stop’ isn’t known

here example code below

#include "stdio.h"  #include "mpi.h"  #define n  		500        /* number of rows , columns in matrix */    mpi_status status;    double a[n][n],b[n][n],c[n][n];	 //matrix used            main(int argc, char **argv){  	struct timeval start, stop;  	int numberoftasks,  	mtype,  	taskid,  	numberofworkers,  	source,  	destination,  	rows,  	averagerow,  	extra,  	offset,i,j,k;  	//first initialization  	mpi_init(&argc, &argv);  	mpi_comm_rank(mpi_comm_world, &taskid);  	mpi_comm_size(mpi_comm_world, &numberoftasks);    	numberofworkers = numberoftasks-1;     //---------------------------- master ----------------------------//  	if (taskid == 0) {  		for (i=0; i<n; i++) {  			for (j=0; j<n; j++) {     				a[i][j]= 1.0;  				b[i][j]= 2.0;  			}  		}        /* send matrix data worker tasks */  	  	gettimeofday(&start, 0);  	      averagerow = n/numberofworkers; //average rows per worker  	extra= n%numberofworkers;		//extra rows      offset = 0;        		for (destination=1; destination<=numberofworkers; destination++){			   	  	  			if(destination<=extra){  				rows = averagerow+1;  			}else{  				rows = averagerow;  			}  			mtype = 1;  			mpi_send(&offset, 1, mpi_int, destination, mtype, mpi_comm_world);  			mpi_send(&rows, 1, mpi_int, destination, mtype, mpi_comm_world);  			mpi_send(&a[offset][0], rows*n, mpi_double,destination,mtype, mpi_comm_world);  			mpi_send(&b, n*n, mpi_double, destination, mtype, mpi_comm_world);  			offset = offset + rows;  		}        /* wait results worker tasks */  		for (i=1; i<=numberofworkers; i++){  			mtype = 2;  			source = i;  			mpi_recv(&offset, 1, mpi_int, source, mtype, mpi_comm_world, &status);  			mpi_recv(&rows, 1, mpi_int, source, mtype, mpi_comm_world, &status);  			mpi_recv(&c[offset][0], rows*n, mpi_double, source, mtype, mpi_comm_world, &status);  		}  		gettimeofday(&stop, 0);  	  		  		printf("upper left = %6.2f    upper right = %6.2f \n",c[0][0],c[0][n-1]);  		printf("lower left = %6.2f    lower right = %6.2f \n",c[n-1][0],c[n-1][n-1]);  		  		fprintf(stdout,"time = %.6f\n\n",(stop.tv_sec+stop.tv_usec*1e-6)-(start.tv_sec+start.tv_usec*1e-6));       	}       /*---------------------------- worker----------------------------*/  	if (taskid > 0) {  		source = 0;  		mtype = 1;  		mpi_recv(&offset, 1, mpi_int, source, mtype, mpi_comm_world, &status);  		mpi_recv(&rows, 1, mpi_int, source, mtype, mpi_comm_world, &status);  		mpi_recv(&a, rows*n, mpi_double, source, mtype, mpi_comm_world, &status);  		mpi_recv(&b, n*n, mpi_double, source, mtype, mpi_comm_world, &status);          /* matrix multiplication */  		for (k=0; k<n; k++)  			for (i=0; i<rows; i++) {  				c[i][k] = 0.0;  				for (j=0; j<n; j++)  				c[i][k] = c[i][k] + a[i][j] * b[j][k];  			}    			mtype = 2;  		mpi_send(&offset, 1, mpi_int, 0, mtype, mpi_comm_world);  		mpi_send(&rows, 1, mpi_int, 0, mtype, mpi_comm_world);  		mpi_send(&c, rows*n, mpi_double, 0, mtype, mpi_comm_world);  	}            mpi_finalize();  }

struct timeval defined in <time.h>, have not yet included.

gettimeofday fine, more "mpi" way use mpi_wtime(). routine returns double, , can avoid struct timeval issue entirely.


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