void *map_get(struct _map *map, const char *key)
{
int hash = hash_sdbm((unsigned char *)key, map->size);
struct _map_entry *entry = &map->buckets[hash];
for (; entry; entry = entry->next) { /* linear search. */
if (entry->hash == hash)
break;
}
if (!entry) /* We haven't found the key. */
return NULL;
return entry->value;
}
int main(int argc, char *argv[]) {
//unsigned long hash;
jhash_t hash;
char *str;
if (argc < 2) {
printf("No string input\n");
exit(0);
}
str = argv[1];
printf("Input: %s\n", str);
hash = hash_djb2(str);
printf("djb2 Hash: %lu\n", hash);
hash = hash_sdbm(str);
printf("sdbm Hash: %lu\n", hash);
hash = hash_lose(str);
printf("lose Hash: %lu\n", hash);
return 0;
}
void map_add(struct _map *map, const char *key, void *value)
{
if (!map || !key || !value)
return;
struct _map_entry *entry;
unsigned long hash = hash_sdbm((unsigned char *)key, map->size);
struct _map_entry *last_entry = &map->buckets[hash];
if (!map->buckets[hash].value) { /* bucket is empty. */
entry = &map->buckets[hash];
} else {
for (; last_entry->next != NULL; last_entry = last_entry->next);
entry = malloc(sizeof(struct _map_entry));
}
if (last_entry != entry)
last_entry->next = entry;
entry->value = value;
entry->hash = hash;
entry->next = NULL;
}
/* helper function to invoke the correct hash method */
static unsigned int gen_hash(const struct proxy* px, const char* key, unsigned long len)
{
unsigned int hash;
switch (px->lbprm.algo & BE_LB_HASH_FUNC) {
case BE_LB_HFCN_DJB2:
hash = hash_djb2(key, len);
break;
case BE_LB_HFCN_WT6:
hash = hash_wt6(key, len);
break;
case BE_LB_HFCN_CRC32:
hash = hash_crc32(key, len);
break;
case BE_LB_HFCN_SDBM:
/* this is the default hash function */
default:
hash = hash_sdbm(key, len);
break;
}
return hash;
}
/* =============================================================================
* hashSegment
* -- For hashtable
* =============================================================================
*/
static ulong_t
hashSegment (const void* keyPtr)
{
return (ulong_t)hash_sdbm((char*)keyPtr); /* can be any "good" hash function */
}
int main (int argc, char *argv[])
{
paper_rec_t DedupeRecord;
dd_uint64_t Unique_CRID; /* Unique CR_ID = (C_ID << 16) | CR_ID */
long victim_index = 0, cache_size, window_size, bloom_filter_size;
long i, j=0, temp_index;
int Initial_Flag = 0, cache_algorithm;
dd_uint8_t *sha1_value=NULL;
int nLen = 0;
long max_counter=0;
HTItem *chunk_item, *item;
long byte_len, temp, offset, ver, temp1; /* to read a trace file */
unsigned long hash1, hash2;
/* Heap Data structure variables */
Cache_Memory Dataitem;
std::vector<Cache_Memory>::iterator itr;
unsigned long writeCounter = 0;
unsigned long access_counter;
long file_position;
FILE *fp1, *fp;
size_t keySize=0,iCnt;
clock_t start = clock();
time_t begin,end;
time(&begin);
if (argc < 5) {
/* 0 1 2 3 4 */
fprintf(stderr, "usage: %s <Cache Size> <Window Size> <Cache Algorithm (0, 1, 2)> <Trace File>\n", argv[0]);
fprintf(stderr, " - Cache Size: Dedupe read cache size in terms of # of data chunk (e.g. 500 chunks = 4MB (500*8KB))\n");
fprintf(stderr, " - Window Size: Future sliding window size in terms of TIMES of cache size.\n");
fprintf(stderr, " - Cache Algorithm: 0 (Belady MIN), 1 (Belady MIN with a future window), 2 (Lookahead read cache)\n");
fprintf(stderr, " - Trace File: Trace file name with path\n");
exit(1);
}
cache_size = atol(argv[1]);
assert(cache_size > 0); /* cache size must be positive */
window_size = atol(argv[2]);
assert(window_size > 0); /* window size must be positive */
cache_algorithm = atoi(argv[3]);
assert((cache_algorithm == 0)||(cache_algorithm == 1)||(cache_algorithm == 2)); /* there are only three selections */
bloom_filter_size = cache_size*2; //No. of Hash functions for BF is 2
bloom_filter = (long *)malloc(sizeof(long)*bloom_filter_size);
ht_cache = AllocateHashTable(SHA1_VALUE_LENGTH, 1);
heap = newMinHeap((u32)cache_size);
if((fp1 = fopen(argv[4], "rb")) == NULL){ //for reading data one by one
DEBUG_INFO("File open error....1\n");
exit (-1);
}
if((fp = fopen(argv[4], "rb")) == NULL){ //for searching its future reference distance
DEBUG_INFO("File open error....2\n");
exit (-1);
}
long c=0, d=0;
u32 itemIndex;
keySize = sizeof(DedupeRecord.fp_bytes);
DEBUG_INFO("Record Size is: %d\n",keySize);
while (1)
{
fread(&DedupeRecord, sizeof(struct _paper_rec_t),1, fp1);
/*if(DedupeRecord.fp_bytes[0] == 0)
DedupeRecord.fp_bytes[0] = '0';*/
/*for(iCnt = 0;iCnt<sizeof(DedupeRecord.fp_bytes);++iCnt)
printf("%c",DedupeRecord.fp_bytes[iCnt]);*/
//DEBUG_INFO("Reading chunks : %ld\n", c++);
c++;
if(c%1000 == 0){
printf("Reading Chunks: %ld\n",c);
}
if (c % 10000 == 0) {
printf("Cache hit ratio: %.3f = %lu / %lu \n",
(double) (Hit_Count * 100) / (double) totalAccess ,
Hit_Count,
totalAccess);
}
if(feof(fp1))
break;
file_position = ftell(fp1);
/* initially fill the cache. During this initialization process, we do not count the cache hit ratio. */
if (Initial_Flag == 0) {
// Temporally store this current access chunk with its future reference distance in the cache
chunk_item = HashFind(ht_cache, PTR_KEY(ht_cache,DedupeRecord.fp_bytes));
//Update Bloom filter counters
hash1 = hash_djb2(DedupeRecord.fp_bytes,keySize)%bloom_filter_size;
hash2 = hash_sdbm(DedupeRecord.fp_bytes,keySize)%bloom_filter_size;
max_counter = bloom_filter[hash1]++;
if((bloom_filter[hash2]++) > max_counter)
max_counter = bloom_filter[hash2];
if(chunk_item) { //Cache Hit
itemIndex = (u32)chunk_item->data;
DEBUG_INFO("Index its updating is %ld:\n",itemIndex);
heapUpdate(heap,max_counter,itemIndex,&ht_cache);
}
else {
heapInsert(heap,DedupeRecord.fp_bytes, max_counter,&ht_cache);
//Sandeep - Insert into Heap and Heapify
cache_counter++;
}
if(cache_counter == cache_size) {
DEBUG_INFO("\n#### Cache Initialization complete~!!####\n");
Initial_Flag = 1;
//Sandeep - Construct Heap and Heapify
//fnBuildHeap(cache_heap);
#ifdef DEBUG
printf("Heap Size is: %d\n",cache_heap.size());
/*PrintHashTable(ht_cache,-1,2);
fnPrintHeap(cache_heap);*/
#endif
}
}
else { /* Once the cache is full of data initially, we start to measure the cache hit ratio from now. */
totalAccess++;
if((totalAccess % 100) == 0) {
DEBUG_INFO("[CHECK] Current Access Number: %ld\n", totalAccess);
}
Unique_CRID = (DedupeRecord.cmc_id << 16) | DedupeRecord.creg_id;
chunk_item = HashFind(ht_cache, PTR_KEY(ht_cache,DedupeRecord.fp_bytes));
if(chunk_item) { //Cache Hit
Hit_Count++;
DEBUG_INFO("Cache Hit\n");
//Update Bloom filter counters
hash1 = hash_djb2(DedupeRecord.fp_bytes,keySize)%bloom_filter_size;
hash2 = hash_sdbm(DedupeRecord.fp_bytes,keySize)%bloom_filter_size;
//DEBUG_INFO("### Returned hash values are %ld and %ld\n",bloom_filter[hash1],bloom_filter[hash2]);
max_counter = bloom_filter[hash1]++;
if((bloom_filter[hash2]++) > max_counter)
max_counter = bloom_filter[hash2];
itemIndex = (ulong)chunk_item->data;
DEBUG_INFO("Index its updating is %ld:\n",itemIndex);
assert(itemIndex>=0 && itemIndex<=cache_size);
heapUpdate(heap,max_counter,itemIndex,&ht_cache);
//Sandeep - Update heap counter val for this chunk with max_counter
//fnUpdateHeap(cache_heap, Read_Cache[(ulong)chunk_item->data],max_counter);
}
else {
heapPopMin(heap,&sha1_value,&access_counter,&ht_cache);
if(!sha1_value)
ERROR("SHA1 Value in main is NULL\n");
/*for(iCnt = 0;iCnt<sizeof(DedupeRecord.fp_bytes);++iCnt)
printf("%c",sha1_value[iCnt]);*/
//Update Bloom filter counters
hash1 = hash_djb2(sha1_value,sizeof(sha1_value))%bloom_filter_size;
hash2 = hash_sdbm(sha1_value,sizeof(sha1_value))%bloom_filter_size;
//DEBUG_INFO("### In Main before decrement %ld and %ld\n",bloom_filter[hash1],bloom_filter[hash2]);
//Decrement BF counters
bloom_filter[hash1]--;
bloom_filter[hash2]--;
free(sha1_value);
//GP - Increment the BF counters for this chunk
hash1 = hash_djb2(DedupeRecord.fp_bytes,keySize)%bloom_filter_size;
hash2 = hash_sdbm(DedupeRecord.fp_bytes,keySize)%bloom_filter_size;
//DEBUG_INFO("### Returned hash values are in main cache_miss %ld and %ld\n",bloom_filter[hash1],bloom_filter[hash2]);
max_counter = bloom_filter[hash1]++;
if((bloom_filter[hash2]++) > max_counter)
max_counter = bloom_filter[hash2];
heapInsert(heap,DedupeRecord.fp_bytes,max_counter,&ht_cache);
if(cache_algorithm == LOOKAHEAD){
/* Check if any other chunks in the current CR will appear within the future window.
If we found one, we add such chunk(s) in the cache. */
Check_Unique_CRID(fp, Unique_CRID, file_position, 0, cache_size, window_size*cache_size, bloom_filter_size);
}
}
} //else
} //while
printf("\n###################################################################\n");
printf("Cache hit ratio: %.3f = %lu / %lu \n", (double) (Hit_Count * 100) / (double) totalAccess , Hit_Count, totalAccess);
printf("Cache size: %ld, window size: %ld\n", cache_size, window_size*cache_size);
printf("Dedupe trace: %s\n", argv[4]);
printf("###################################################################\n");
fclose(fp1);
fclose(fp);
FreeHashTable(ht_cache);
deleteMinHeap(heap);
time(&end);
printf("###################################################################\n");
printf("Total time taken is %f \n",((double)clock()-start)/CLOCKS_PER_SEC);
printf("###################################################################\n");
return 0;
}
void Check_Unique_CRID(FILE *pFile, dd_uint64_t Current_Unique_CRID, long position, long distance, long cache_size, long window_size, long bloom_filter_size)
{
long i, victim_index;
dd_uint64_t Temp_Unique_CRID;
paper_rec_t Temp_DedupeTrace;
long window_counter=0;
long max_counter=0, temp_index=0;
dd_uint8_t *sha1_value=NULL;
HTItem *chunk_item, *item;
unsigned long hash1, hash2;
unsigned long access_counter;
size_t keySize = sizeof(Temp_DedupeTrace.fp_bytes),iCnt;
bool flag=true;
std::list<paper_rec_t>::iterator itr;
/* Heap Data structure variables */
/* Check the size of sliding window vector if its empty
* the check unique crid has been called first time
* initialize the vector with size of sliding window */
if(SlidingWindow.size() == 0)
{
fseek(pFile, position, SEEK_SET);
while (1)
{
fread(&Temp_DedupeTrace, sizeof(struct _paper_rec_t),1, pFile);
/*if(Temp_DedupeTrace.fp_bytes[0] == 0)
Temp_DedupeTrace.fp_bytes[0] = '0';*/
if(feof(pFile))
break;
SlidingWindow.push_back(Temp_DedupeTrace);
if(SlidingWindow.size() >= window_size) {
break;
}
}
}
else if(SlidingWindow.size() == window_size){
/* Remove one old record and insert the latest record */
SlidingWindow.pop_front();
fseek(pFile, position + window_size, SEEK_SET);
fread(&Temp_DedupeTrace, sizeof(struct _paper_rec_t),1, pFile);
SlidingWindow.push_back(Temp_DedupeTrace);
}
for(itr = SlidingWindow.begin();itr!=SlidingWindow.end();itr++){
Temp_Unique_CRID = ((*itr).cmc_id << 16) | (*itr).creg_id;
/* if any data chunk in current CR appear within the future window */
if(Temp_Unique_CRID == Current_Unique_CRID) {
DEBUG_INFO("[Found~!!] A chunk in current access CR will appeare within a future window.\n");
chunk_item = HashFind(ht_cache, PTR_KEY(ht_cache,(*itr).fp_bytes));
if(chunk_item) { //Cache Hit
DEBUG_INFO("Cache Hit - New\n");
//Update Bloom filter counters
hash1 = hash_djb2((*itr).fp_bytes,keySize)%bloom_filter_size;
hash2 = hash_sdbm((*itr).fp_bytes,keySize)%bloom_filter_size;
/* DEBUG_INFO("### Returned hash values are %ld and %ld\n",bloom_filter[hash1],bloom_filter[hash2]);*/
max_counter = bloom_filter[hash1]++;
if((bloom_filter[hash2]++) > max_counter)
max_counter = bloom_filter[hash2];
temp_index = (u32)chunk_item->data;
/* DEBUG_INFO("Index its updating is %ld:\n",temp_index);*/
heapUpdate(heap, max_counter, temp_index,&ht_cache);
}
else {
//Sandeep - Choose victim from heap and strcpy Sha1 Value of the victim chunk to "sha1_value" variable
/*sha1_value = fnDeleteItemHeap(cache_heap);*/
//GP - Increment the BF counters for this chunk
hash1 = hash_djb2((*itr).fp_bytes,keySize)%bloom_filter_size;
hash2 = hash_sdbm((*itr).fp_bytes,keySize)%bloom_filter_size;
//DEBUG_INFO("### Returned hash values are before insert cache miss %ld and %ld\n",bloom_filter[hash1],bloom_filter[hash2]);
max_counter = bloom_filter[hash1]++;
if((bloom_filter[hash2]++) > max_counter)
max_counter = bloom_filter[hash2];
flag = checkMin(heap,max_counter);
/* If Min on heap is less than the new chuck then only replace with new
* else just skip */
if(flag){
heapPopMin(heap,&sha1_value,&access_counter,&ht_cache);
if(!sha1_value)
ERROR("SHA1 Value in Check Unique CR is NULL\n");
/*for(iCnt = 0;iCnt<sizeof((*itr).fp_bytes);++iCnt)
printf("%c",sha1_value[iCnt]);*/
//Update Bloom filter counters
hash1 = hash_djb2(sha1_value,sizeof(sha1_value))%bloom_filter_size;
hash2 = hash_sdbm(sha1_value,sizeof(sha1_value))%bloom_filter_size;
//DEBUG_INFO("### Before Decrementing values are %ld and %ld\n",bloom_filter[hash1],bloom_filter[hash2]);
//Decrement BF counters
bloom_filter[hash1]--;
bloom_filter[hash2]--;
free(sha1_value);
//Sandeep - Insert chunk into Heap with max_counter
heapInsert(heap,(*itr).fp_bytes,max_counter,&ht_cache);
}
}
}
}
}
/* =============================================================================
* hashSegment
* -- For hashtable
* =============================================================================
*/
static unsigned long
hashSegment (const void* keyPtr)
{
return hash_sdbm((char*)keyPtr); /* can be any "good" hash function */
}