double
bash(
char *region,
long nbytes, /* size of region to bash (bytes) */
long stride, /* stride through region (bytes) */
long iters /* target # of loop iterations */
)
{
signed long count;
signed long reps;
clock_t start, stop;
double utime, stime;
count = ((nbytes - sizeof(int)) / stride) + 1;
if (! (((count - 1) * stride + sizeof(int)) <= nbytes)) {
fprintf(stderr, "trip count problem\n");
exit(1);
}
reps = (iters + count - 1) / count;
if (reps <= 0)
reps = 1;
iters = reps * count;
/* make sure the memory is allocated */
memset(region, 0, nbytes);
memset(region, 1, nbytes);
allocate_memory(region, nbytes);
memset(region, 0, nbytes);
/* warm up the cache */
(void) bash_loop(region, count, stride, 1L);
/* run the bash loop */
start = clock();
(void) bash_loop(region, count, stride, reps);
stop = clock();
utime = (double) (stop - start) / CLOCKS_PER_SEC;
stime = 0.0;
return 1e9 * ((utime + stime) / iters);
}
int main()
{
return bash_loop();
}
