Ajay Mohan / Rasperf

Commit 6c373d6659f2b628fe038bee1e9b901b704f2342

Authored by Sathya Narayanan 2016-02-26 18:51:44 -0800

Exists in master

Correct code for memory acess time

Showing 1 changed file with 1 additions and 1 deletions Inline Diff

memory_access_time.c

#include<stdio.h>	1	1	#include<stdio.h>
#include <sys/time.h>	2	2	#include <sys/time.h>
#include <stdlib.h>	3	3	#include <stdlib.h>
	4	4
#define KB 1024	5	5	#define KB 1024
#define MB 1024 * KB	6	6	#define MB 1024 * KB
#define MAX_ARRAY_SIZE 32*MB	7	7	#define MAX_ARRAY_SIZE 32*MB
#define STRIDE_SIZE 16	8	8	#define STRIDE_SIZE 16
#define CPU_FREQ 900	9	9	#define CPU_FREQ 900
	10	10
typedef unsigned long long int u64;	11	11	typedef unsigned long long int u64;
	12	12
u64 access_time_1(u64 size, int stride_size){	13	13	u64 access_time_1(u64 size, int stride_size){
struct timeval start, end;	14	14	struct timeval start, end;
struct timezone tz;	15	15	struct timezone tz;
	16	16
int array = (int )malloc(size);	17	17	int array = (int )malloc(size);
int len = (size)/sizeof(int);	18	18	int len = (size)/sizeof(int);
unsigned int i;	19	19	unsigned int i;
	20	20
gettimeofday(&start, &tz);	21	21	gettimeofday(&start, &tz);
for(i=0; i < MAX_ARRAY_SIZE; i++) {	22	22	for(i=0; i < MAX_ARRAY_SIZE; i++) {
array[( i * stride_size) % len]++;	23	23	array[( i * stride_size) % len]++;
}	24	24	}
gettimeofday(&end, &tz);	25	25	gettimeofday(&end, &tz);
	26	26
free(array);	27	27	free(array);
return ((end.tv_sec * 1e6) + end.tv_usec - (start.tv_sec * 1e6) - start.tv_usec);	28	28	return ((end.tv_sec * 1e6) + end.tv_usec - (start.tv_sec * 1e6) - start.tv_usec);
}	29	29	}
	30	30
int main()	31	31	int main()
{	32	32	{
int i, j;	33	33	int i, j;
	34	34
for (j = 4; j <= 32; j*=2) {	35	35	for (j = 4; j <= 256; j*=2) {
printf("Stride size: %u\n", j);	36	36	printf("Stride size: %u\n", j);
for (i = 1024; i <= 32 * MB; i*=2) {	37	37	for (i = 1024; i <= 32 * MB; i*=2) {
u64 access_time = access_time_1(i, j);	38	38	u64 access_time = access_time_1(i, j);