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/*
* mm.c
* Memory management/migration
*
* by Nan Dun <dun@logos.ic.i.u-tokyo.ac.jp>
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <pthread.h>
#include <sys/time.h>
#define ARR_SIZE 1
#define BLK_SIZE 1048576
#define MEM_TRACE
#ifdef MEM_TRACE
#include <mcheck.h>
#endif
struct data {
char **arr;
int mem_allocated;
double t_alloc, t_free, t_realloc, t_refree, t_total;
};
inline double curr_time(void)
{
struct timeval tv;
gettimeofday(&tv, NULL);
return tv.tv_sec * 1e6 + (double) tv.tv_usec;
}
void * malloc_local(void *args)
{
struct data *p = (struct data *) args;
unsigned long tid;
int i;
tid = pthread_self();
// malloc
printf(" Thread %lu: malloc\n", tid);
p->t_alloc = curr_time();
p->arr = malloc(sizeof(char *) * ARR_SIZE);
if (p->arr == NULL) {
perror(NULL);
abort();
}
for (i = 0; i < ARR_SIZE; i++) {
p->arr[i] = (char *) malloc(sizeof(char) * BLK_SIZE);
if (p->arr[i] == NULL) {
perror(NULL);
abort();
}
}
p->t_alloc = curr_time() - p->t_alloc;
// free
printf(" Thread %lu: free\n", tid);
p->t_free = curr_time();
for (i = 0; i < ARR_SIZE; i++)
free(p->arr[i]);
free(p->arr);
p->t_free = curr_time() - p->t_free;
// re-malloc
printf(" Thread %lu: re-malloc\n", tid);
p->t_realloc = curr_time();
p->arr = malloc(sizeof(char *) * ARR_SIZE);
if (p->arr == NULL) {
perror(NULL);
abort();
}
for (i = 0; i < ARR_SIZE; i++) {
p->arr[i] = (char *) malloc(sizeof(char) * BLK_SIZE);
if (p->arr[i] == NULL) {
perror(NULL);
abort();
}
}
p->t_realloc = curr_time() - p->t_realloc;
// re-free
printf(" Thread %lu: re-free\n", tid);
p->t_refree = curr_time();
for (i = 0; i < ARR_SIZE; i++)
free(p->arr[i]);
free(p->arr);
p->t_refree = curr_time() - p->t_refree;
p->t_total = p->t_alloc + p->t_free + p->t_realloc + p->t_refree;
printf(" Thread %lu: exit\n", tid);
pthread_exit((void *) 0);
}
pthread_mutex_t mutex;
pthread_cond_t cond;
void * malloc_remote_from(void *args)
{
struct data *p = (void *) args;
unsigned long tid;
int i;
tid = pthread_self();
pthread_mutex_lock(&mutex);
// malloc
printf(" Thread %lu: malloc\n", tid);
p->t_alloc = curr_time();
p->arr = (char **) malloc(sizeof(char *) * ARR_SIZE);
if (p->arr == NULL) {
perror(NULL);
abort();
}
for (i = 0; i < ARR_SIZE; i++) {
(p->arr)[i] = (char *) malloc(sizeof(char) * BLK_SIZE);
if ((p->arr)[i] == NULL) {
perror(NULL);
abort();
}
}
p->t_alloc = curr_time() - p->t_alloc;
p->mem_allocated = 1;
pthread_cond_signal(&cond);
pthread_mutex_unlock(&mutex);
pthread_mutex_lock(&mutex);
while (p->mem_allocated == 1)
pthread_cond_wait(&cond, &mutex);
pthread_mutex_unlock(&mutex);
p->t_total = p->t_alloc + p->t_free + p->t_realloc + p->t_refree;
printf(" Thread %lu: exit\n", tid);
pthread_exit((void *) 0);
}
void * malloc_remote_to(void *args)
{
struct data *p = (void *) args;
unsigned long tid;
int i;
tid = pthread_self();
pthread_mutex_lock(&mutex);
while (p->mem_allocated == 0)
pthread_cond_wait(&cond, &mutex);
pthread_mutex_unlock(&mutex);
// free
printf(" Thread %lu: free\n", tid);
p->t_free = curr_time();
for (i = 0; i < ARR_SIZE; i++)
free(p->arr[i]);
free(p->arr);
p->t_free = curr_time() - p->t_free;
// re-malloc
printf(" Thread %lu: re-malloc\n", tid);
p->t_realloc = curr_time();
p->arr = malloc(sizeof(char *) * ARR_SIZE);
if (p->arr == NULL) {
perror(NULL);
abort();
}
for (i = 0; i < ARR_SIZE; i++) {
p->arr[i] = (char *) malloc(sizeof(char) * BLK_SIZE);
if (p->arr[i] == NULL) {
perror(NULL);
abort();
}
}
p->t_realloc = curr_time() - p->t_realloc;
// re-free
printf(" Thread %lu: re-free\n", tid);
p->t_refree = curr_time();
for (i = 0; i < ARR_SIZE; i++)
free(p->arr[i]);
free(p->arr);
p->t_refree = curr_time() - p->t_refree;
#ifdef MEM_TRACE
muntrace();
#endif
pthread_mutex_lock(&mutex);
p->mem_allocated = 0;
pthread_cond_signal(&cond);
pthread_mutex_unlock(&mutex);
printf(" Thread %lu: exit\n", tid);
pthread_exit((void *) 0);
}
int main(int argc, char **argv)
{
pthread_t tha, thb;
struct data dat;
int nthreads;
int ret;
nthreads = argc == 1 ? 1 : atoi(argv[1]);
printf("Memory management/migration test (usec)\n");
#ifdef MEM_TRACE
mtrace();
#endif
if (nthreads == 1) {
printf("One thread...\n");
pthread_create(&tha, NULL, malloc_local, (void *) &dat);
pthread_join(tha, (void **) &ret);
printf(" malloc: %.2f\n"
" free: %.2f\n"
" re-malloc: %.2f\n"
" re-free: %.2f\n"
" Total: %.2f\n", dat.t_alloc, dat.t_free,
dat.t_realloc, dat.t_refree, dat.t_total);
}
if (nthreads >= 2) {
printf("Two threads...\n");
dat.mem_allocated = 0;
pthread_mutex_init(&mutex, NULL);
pthread_cond_init(&cond, NULL);
pthread_create(&tha, NULL, malloc_remote_from, (void *) &dat);
pthread_create(&thb, NULL, malloc_remote_to, (void *) &dat);
pthread_join(tha, (void **) &ret);
pthread_join(thb, (void **) &ret);
pthread_mutex_destroy(&mutex);
pthread_cond_destroy(&cond);
printf(" malloc: %.2f\n"
" free: %.2f\n"
" re-malloc: %.2f\n"
" re-free: %.2f\n"
" Total: %.2f\n", dat.t_alloc, dat.t_free,
dat.t_realloc, dat.t_refree, dat.t_total);
}
return 0;
}
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