int test_destroy_erases(fake_www *www){
int i;
size_t sz;
struct MemoryStruct chunk;
char* data;
fake_www_get(www, www->sites[i].url, &chunk);
/*Works once */
gtcache_init(FAKE_WWW_MIN_CACHE_LEN * 8, FAKE_WWW_MIN_CACHE_LEN, 1);
gtcache_set(www->sites[0].url, chunk.memory, chunk.size + 1);
gtcache_destroy();
free(chunk.memory);
/*Should be empty now*/
gtcache_init(FAKE_WWW_MIN_CACHE_LEN, 1, FAKE_WWW_MIN_CACHE_LEN);
data = gtcache_get(www->sites[0].url, &sz);
if( data == NULL)
return 1;
else{
free(data);
return 0;
}
}
int main(int argc, char* argv[]){
struct MemoryStruct chunk;
char url[FAKE_WWW_MAX_URL_LEN];
char *data, *res;
int i, hits, misses, Npts, started;
int min_cache_sz, max_cache_sz, cache_sz;
int num_requests, nlevels, urlcount;
fake_www www;
size_t sz;
if(argc < 3){
fprintf(stderr,"Usage: cache_test [FAKE_WWW] [NUM_REQUESTS] \n");
exit(0);
}
srand(12314);
fake_www_init(&www, argv[1], 0);
num_requests = strtol(argv[2], NULL, 10);
Npts = 20;
/*Setting minimum and maximum cache sizes*/
min_cache_sz = 1 << 20;
max_cache_sz = 1 << 24;
nlevels = numlevels(&www);
for(i = 0; i < Npts; i++){
/*Cache sizes go up on a logarithmic scale*/
cache_sz = (int) (min_cache_sz * pow( 1.0 * max_cache_sz / min_cache_sz, 1.0 * i / (Npts-1)));
gtcache_init(cache_sz, FAKE_WWW_MIN_CACHE_LEN, nlevels);
hits = 0;
misses = 0;
started = 0;
urlcount = 0;
rewind(stdin);
while(hits + misses < num_requests){
res = fgets(url, FAKE_WWW_MAX_URL_LEN, stdin);
if (res == NULL){
if(!feof(stdin)){
/*We should always be able to read from the file*/
fprintf(stderr, "Error parsing the list of requests\n");
exit(EXIT_FAILURE);
}
else{
/*Rewind to the beginning if we've reached the end*/
started = 1;
rewind(stdin);
if( urlcount == 0 ){
fprintf(stderr, "No valid requests in the input file.\n");
exit(EXIT_FAILURE);
}
urlcount = 0;
continue;
}
}
/*Treat lines starting in # as comments*/
if (url[0] == '#')
continue;
/*Stripping url of any trailing whitespace*/
rstrip(url);
if(strlen(url) == 0)
continue;
urlcount++;
data = gtcache_get(url, &sz);
if(data != NULL){
/*Cache hit!*/
hits+= started;
free(data);
}
else{
/*Cache miss!*/
misses+= started;
fake_www_get(&www, url, &chunk);
/*Accounting for cold start. Only once the cache_size is reached do we start counting*/
if( gtcache_memused() + chunk.size + 1> cache_sz)
started = 1;
gtcache_set(url, chunk.memory, chunk.size + 1);
free(chunk.memory);
}
}
gtcache_destroy();
printf("%d\t%f\n", cache_sz, 1.0*hits/(hits + misses));
}
return 0;
}
