A simple timer (non-MPI)

struct timeval tempo1, tempo2;

long elapsed_utime; /* elapsed time in microseconds */

long elapsed_mtime; /* elapsed time in milliseconds */

long elapsed_seconds; /* diff between seconds counter */

long elapsed_useconds; /* diff between microseconds counter */

long total_usec = 0, total_msec = 0;

void StartSysTimer() {

gettimeofday(&tempo1, NULL);

}

void EndSysTimer() {

gettimeofday(&tempo2, NULL);

elapsed_seconds = tempo2.tv_sec - tempo1.tv_sec;

elapsed_useconds = tempo2.tv_usec - tempo1.tv_usec;

elapsed_utime = (elapsed_seconds) * 1000000 + elapsed_useconds;

elapsed_mtime = ((elapsed_seconds) * 1000 + elapsed_useconds/1000.0) + 0.5;

total_usec = total_usec + elapsed_utime;

total_msec = total_msec + elapsed_mtime;

}

void OutputTime() {

printf("Elapsed time = %ld microseconds\n", total_usec);

printf("Elapsed time = %ld milliseconds\n", total_msec);

}