Function dump_cached_obj_age

libCacheSim/cache/cache.c:439–475

* @brief dump the age distribution of cached objects to a file * * WARNNING: this function obtain the age via evicting the cached objects * so the cache state will change after calling this function * * @param cache * @param req used to provide the current time * @param ofilepath * @return true * @return false */

 * @return false
 */
bool dump_cached_obj_age(cache_t *cache, const request_t *req, const char *ofilepath) {
  FILE *ofile = fopen(ofilepath, "a");
  if (ofile == NULL) {
    perror("fopen failed");
    return false;
  }

  /* clear/reset eviction age counters */
  for (int i = 0; i < EVICTION_AGE_ARRAY_SZE; i++) {
    cache->log_eviction_age_cnt[i] = 0;
  }

  int64_t n_cached_obj = cache->get_n_obj(cache);
  int64_t n_evicted_obj = 0;
  /* evict all the objects */
  while (cache->get_occupied_byte(cache) > 0) {
    cache->evict(cache, req);
    n_evicted_obj++;
  }
  assert(n_cached_obj == n_evicted_obj);

  int64_t n_ages = 0;
  /* dump the cached objects' ages */
  fprintf(ofile, "%s, cached_obj age, cache size: %lu, ", cache->cache_name, (unsigned long)cache->cache_size);
  for (int i = 0; i < EVICTION_AGE_ARRAY_SZE; i++) {
    if (cache->log_eviction_age_cnt[i] == 0) {
      continue;
    }
    n_ages += cache->log_eviction_age_cnt[i];
    fprintf(ofile, "%lld:%ld, ", (long long)pow(EVICTION_AGE_LOG_BASE, i), (long)cache->log_eviction_age_cnt[i]);
  }
  fprintf(ofile, "\n");
  assert(n_ages == n_cached_obj);

  fclose(ofile);
  return true;
}

void generate_cache_name(cache_t *cache, char *str_dest, int str_dest_len) {
  int len = snprintf(str_dest, str_dest_len, "%s", cache->cache_name);