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Stable version of BRZ algorithm

This commit is contained in:
fc_botelho 2005-09-06 14:11:37 +00:00
parent 0bd5ad5d1a
commit d686e0a53e
5 changed files with 35 additions and 121 deletions
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9
src/bmz.c
View File

@ -15,13 +15,6 @@
//#define DEBUG
#include "debug.h"
//static cmph_uint32 UNDEFINED = UINT_MAX;
/* static const char bitmask[8] = { 1, 1 << 1, 1 << 2, 1 << 3, 1 << 4, 1 << 5, 1 << 6, 1 << 7 }; */
/* #define GETBIT(array, i) (array[(i) / 8] & bitmask[(i) % 8]) */
/* #define SETBIT(array, i) (array[(i) / 8] |= bitmask[(i) % 8]) */
/* #define UNSETBIT(array, i) (array[(i) / 8] &= (~(bitmask[(i) % 8]))) */
static int bmz_gen_edges(cmph_config_t *mph);
static cmph_uint8 bmz_traverse_critical_nodes(bmz_config_data_t *bmz, cmph_uint32 v, cmph_uint32 * biggest_g_value, cmph_uint32 * biggest_edge_value, cmph_uint8 * used_edges, cmph_uint8 * visited);
static cmph_uint8 bmz_traverse_critical_nodes_heuristic(bmz_config_data_t *bmz, cmph_uint32 v, cmph_uint32 * biggest_g_value, cmph_uint32 * biggest_edge_value, cmph_uint8 * used_edges, cmph_uint8 * visited);
@ -535,7 +528,7 @@ cmph_uint32 bmz_search(cmph_t *mphf, const char *key, cmph_uint32 keylen)
DEBUGP("key: %s h1: %u h2: %u\n", key, h1, h2);
if (h1 == h2 && ++h2 > bmz->n) h2 = 0;
DEBUGP("key: %s g[h1]: %u g[h2]: %u edges: %u\n", key, bmz->g[h1], bmz->g[h2], bmz->m);
return (bmz->g[h1] + bmz->g[h2]);
return bmz->g[h1] + bmz->g[h2];
}
void bmz_destroy(cmph_t *mphf)
{

11
src/bmz8.c
View File

@ -87,7 +87,7 @@ cmph_t *bmz8_new(cmph_config_t *mph, float c)
{
// Mapping step
cmph_uint8 biggest_g_value = 0;
cmph_uint8 biggest_edge_value = 1;
cmph_uint8 biggest_edge_value = 1;
iterations = 100;
if (mph->verbosity)
{
@ -100,7 +100,7 @@ cmph_t *bmz8_new(cmph_config_t *mph, float c)
bmz8->hashes[0] = hash_state_new(bmz8->hashfuncs[0], bmz8->n);
DEBUGP("hash function 2\n");
bmz8->hashes[1] = hash_state_new(bmz8->hashfuncs[1], bmz8->n);
DEBUGP("Generating edges\n");
DEBUGP("Generating edges\n");
ok = bmz8_gen_edges(mph);
if (!ok)
{
@ -120,7 +120,7 @@ cmph_t *bmz8_new(cmph_config_t *mph, float c)
}
if (iterations == 0)
{
graph_destroy(bmz8->graph);
graph_destroy(bmz8->graph);
return NULL;
}
@ -375,9 +375,10 @@ static void bmz8_traverse(bmz8_config_data_t *bmz8, cmph_uint8 * used_edges, cmp
while((neighbor = graph_next_neighbor(bmz8->graph, &it)) != GRAPH_NO_NEIGHBOR)
{
if(GETBIT(visited,neighbor)) continue;
DEBUGP("Visiting neighbor %u\n", neighbor);
//DEBUGP("Visiting neighbor %u\n", neighbor);
*unused_edge_index = next_unused_edge(bmz8, used_edges, *unused_edge_index);
bmz8->g[neighbor] = *unused_edge_index - bmz8->g[v];
//if (bmz8->g[neighbor] >= bmz8->m) bmz8->g[neighbor] += bmz8->m;
SETBIT(visited, neighbor);
(*unused_edge_index)++;
bmz8_traverse(bmz8, used_edges, neighbor, unused_edge_index, visited);
@ -437,7 +438,7 @@ static int bmz8_gen_edges(cmph_config_t *mph)
mph->key_source->dispose(mph->key_source->data, key, keylen);
return 0;
}
DEBUGP("Adding edge: %u -> %u for key %s\n", h1, h2, key);
//DEBUGP("Adding edge: %u -> %u for key %s\n", h1, h2, key);
mph->key_source->dispose(mph->key_source->data, key, keylen);
// fprintf(stderr, "key = %s -- dispose BMZ\n", key);
multiple_edges = graph_contains_edge(bmz8->graph, h1, h2);

131
src/brz.c
View File

@ -1,7 +1,7 @@
#include "graph.h"
#include "bmz.h"
#include "bmz_structs.h"
#include "bmz8.h"
#include "bmz8_structs.h"
#include "brz.h"
#include "cmph_structs.h"
#include "brz_structs.h"
@ -22,7 +22,7 @@ static int brz_gen_graphs(cmph_config_t *mph);
static cmph_uint32 brz_min_index(cmph_uint32 * vector, cmph_uint32 n);
static char * brz_read_key(FILE * fd);
static void brz_destroy_keys_vd(char ** keys_vd, cmph_uint8 nkeys);
static void brz_copy_partial_mphf(brz_config_data_t *brz, bmz_data_t * bmzf, cmph_uint32 index, cmph_io_adapter_t *source);
static void brz_copy_partial_mphf(brz_config_data_t *brz, bmz8_data_t * bmzf, cmph_uint32 index, cmph_io_adapter_t *source);
brz_config_data_t *brz_config_new()
{
@ -37,6 +37,7 @@ brz_config_data_t *brz_config_new()
brz->h1 = NULL;
brz->h2 = NULL;
brz->h3 = NULL;
brz->memory_availability = 1024*1024;
brz->tmp_dir = (cmph_uint8 *)calloc(10, sizeof(cmph_uint8));
strcpy(brz->tmp_dir, "/var/tmp/\0");
assert(brz);
@ -64,6 +65,12 @@ void brz_config_set_hashfuncs(cmph_config_t *mph, CMPH_HASH *hashfuncs)
}
}
void brz_config_set_memory_availability(cmph_config_t *mph, cmph_uint32 memory_availability)
{
brz_config_data_t *brz = (brz_config_data_t *)mph->data;
brz->memory_availability = memory_availability*1024*1024;
}
void brz_config_set_tmp_dir(cmph_config_t *mph, cmph_uint8 *tmp_dir)
{
brz_config_data_t *brz = (brz_config_data_t *)mph->data;
@ -84,73 +91,6 @@ void brz_config_set_tmp_dir(cmph_config_t *mph, cmph_uint8 *tmp_dir)
}
}
// static cmph_uint8 brz_verify_mphf(cmph_t * mphf, cmph_io_adapter_t *source)
// {
// cmph_uint8 * hashtable = NULL;
// cmph_uint32 i;
// hashtable = (cmph_uint8*)malloc(source->nkeys*sizeof(cmph_uint8));
// source->rewind(source->data);
// memset(hashtable, 0, source->nkeys);
// //check all keys
// for (i = 0; i < source->nkeys; ++i)
// {
// cmph_uint32 h;
// char *buf;
// cmph_uint32 buflen = 0;
// source->read(source->data, &buf, &buflen);
// h = cmph_search(mphf, buf, buflen);
// if(hashtable[h])
// {
// fprintf(stderr, "collision: %u\n",h);
// return 0;
// }
// //assert(hashtable[h]==0);
// hashtable[h] = 1;
// source->dispose(source->data, buf, buflen);
// }
// fprintf(stderr, "\n===============================================================================\n");
// free(hashtable);
// return 1;
// }
//
// static cmph_uint8 brz_verify_mphf1(hash_state_t *h1, hash_state_t *h2, cmph_uint8 * g, cmph_uint32 n, cmph_io_adapter_t *source)
// {
// cmph_uint8 * hashtable = NULL;
// cmph_uint32 i;
// hashtable = (cmph_uint8*)calloc(source->nkeys, sizeof(cmph_uint8));
// source->rewind(source->data);
// //memset(hashtable, 0, source->nkeys);
// //check all keys
// for (i = 0; i < source->nkeys; ++i)
// {
// cmph_uint32 h1_v;
// cmph_uint32 h2_v;
// cmph_uint32 h;
// char *buf;
// cmph_uint32 buflen = 0;
// source->read(source->data, &buf, &buflen);
//
// h1_v = hash(h1, buf, buflen) % n;
//
// h2_v = hash(h2, buf, buflen) % n;
//
// if (h1_v == h2_v && ++h2_v >= n) h2_v = 0;
//
// h = ((cmph_uint32)g[h1_v] + (cmph_uint32)g[h2_v]) % source->nkeys;
//
// if(hashtable[h])
// {
// fprintf(stderr, "collision: %u\n",h);
// return 0;
// }
// //assert(hashtable[h]==0);
// hashtable[h] = 1;
// source->dispose(source->data, buf, buflen);
//
// }
// free(hashtable);
// return 1;
// }
cmph_t *brz_new(cmph_config_t *mph, float c)
{
@ -244,13 +184,12 @@ cmph_t *brz_new(cmph_config_t *mph, float c)
static int brz_gen_graphs(cmph_config_t *mph)
{
#pragma pack(1)
cmph_uint32 i, e;
brz_config_data_t *brz = (brz_config_data_t *)mph->data;
cmph_uint32 memory_availability = 209715200;//200MB //104857600;//100MB //524288000; // 500MB //209715200; // 200 MB
//cmph_uint32 memory_availability = 200*1024*1024;
cmph_uint32 memory_usage = 0;
cmph_uint32 nkeys_in_buffer = 0;
cmph_uint8 *buffer = (cmph_uint8 *)malloc(memory_availability);
cmph_uint8 *buffer = (cmph_uint8 *)malloc(brz->memory_availability);
cmph_uint32 *buckets_size = (cmph_uint32 *)calloc(brz->k, sizeof(cmph_uint32));
cmph_uint32 *keys_index = NULL;
cmph_uint8 **buffer_merge = NULL;
@ -276,7 +215,7 @@ static int brz_gen_graphs(cmph_config_t *mph)
mph->key_source->read(mph->key_source->data, &key, &keylen);
/* Buffers management */
if (memory_usage + keylen + 1 > memory_availability) // flush buffers
if (memory_usage + keylen + 1 > brz->memory_availability) // flush buffers
{
if(mph->verbosity)
{
@ -305,7 +244,6 @@ static int brz_gen_graphs(cmph_config_t *mph)
buckets_size[h3]++;
memory_usage = memory_usage + keylen1 + 1;
}
// sprintf(filename, "/mnt/hd4/fbotelho/%u.cmph",nflushes);
filename = (char *)calloc(strlen(brz->tmp_dir) + 11, sizeof(char));
sprintf(filename, "%s%u.cmph",brz->tmp_dir, nflushes);
tmp_fd = fopen(filename, "wb");
@ -323,11 +261,10 @@ static int brz_gen_graphs(cmph_config_t *mph)
free(keys_index);
fclose(tmp_fd);
}
//fprintf(stderr, "Storing read Key\n");
memcpy(buffer + memory_usage, key, keylen + 1);
memory_usage = memory_usage + keylen + 1;
h3 = hash(brz->h3, key, keylen) % brz->k;
if (brz->size[h3] == MAX_BUCKET_SIZE)
if ((brz->size[h3] == MAX_BUCKET_SIZE) || ((brz->c >= 1.0) && (cmph_uint8)(brz->c * brz->size[h3]) < brz->size[h3]))
{
free(buffer);
free(buckets_size);
@ -367,8 +304,6 @@ static int brz_gen_graphs(cmph_config_t *mph)
buckets_size[h3]++;
memory_usage = memory_usage + keylen1 + 1;
}
// sprintf(filename, "/mnt/hd4/fbotelho/%u.cmph",nflushes);
// sprintf(filename, "/mnt/sd2/fbotelho/dados/%u.cmph",nflushes);
filename = (char *)calloc(strlen(brz->tmp_dir) + 11, sizeof(char));
sprintf(filename, "%s%u.cmph",brz->tmp_dir, nflushes);
tmp_fd = fopen(filename, "wb");
@ -401,8 +336,6 @@ static int brz_gen_graphs(cmph_config_t *mph)
for(i = 0; i < nflushes; i++)
{
// sprintf(filename, "/mnt/hd4/fbotelho/%u.cmph",i);
// sprintf(filename, "/mnt/sd2/fbotelho/dados/%u.cmph",i);
filename = (char *)calloc(strlen(brz->tmp_dir) + 11, sizeof(char));
sprintf(filename, "%s%u.cmph",brz->tmp_dir, i);
tmp_fds[i] = fopen(filename, "rb");
@ -420,7 +353,6 @@ static int brz_gen_graphs(cmph_config_t *mph)
e = 0;
keys_vd = (char **)calloc(MAX_BUCKET_SIZE, sizeof(char *));
nkeys_vd = 0;
//buffer = (cmph_uint8 *)malloc(memory_availability);
while(e < brz->m)
{
i = brz_min_index(buffer_h3, nflushes);
@ -436,56 +368,43 @@ static int brz_gen_graphs(cmph_config_t *mph)
if (h3 != buffer_h3[i]) break;
keys_vd[nkeys_vd++] = key;
//save_in_disk(buffer, key, keylen, &memory_usage, memory_availability, graphs_fd);
//fwrite(key, 1, keylen + 1, graphs_fd);
e++;
//free(key);
key = brz_read_key(tmp_fds[i]);
}
if (key)
{
//save_in_disk(buffer, buffer_merge[i], strlen(buffer_merge[i]), &memory_usage, memory_availability, graphs_fd);
assert(nkeys_vd < brz->size[cur_bucket]);
keys_vd[nkeys_vd++] = buffer_merge[i];
//fwrite(buffer_merge[i], 1, strlen(buffer_merge[i]) + 1, graphs_fd);
e++;
buffer_h3[i] = h3;
//free(buffer_merge[i]);
buffer_merge[i] = (cmph_uint8 *)calloc(keylen + 1, sizeof(cmph_uint8));
memcpy(buffer_merge[i], key, keylen + 1);
free(key);
}
}
/* fprintf(stderr, "BOSTA %u %u e: %u\n", i, buffer_h3[i], e);*/
if(!key)
{
assert(nkeys_vd < brz->size[cur_bucket]);
keys_vd[nkeys_vd++] = buffer_merge[i];
//save_in_disk(buffer, buffer_merge[i], strlen(buffer_merge[i]), &memory_usage, memory_availability, graphs_fd);
//fwrite(buffer_merge[i], 1, strlen(buffer_merge[i]) + 1, graphs_fd);
e++;
buffer_h3[i] = UINT_MAX;
//free(buffer_merge[i]);
buffer_merge[i] = NULL;
}
if(nkeys_vd == brz->size[cur_bucket]) // Generating mphf.
if(nkeys_vd == brz->size[cur_bucket]) // Generating mphf for each bucket.
{
cmph_io_adapter_t *source = NULL;
cmph_config_t *config = NULL;
cmph_t *mphf_tmp = NULL;
bmz_data_t * bmzf = NULL;
bmz8_data_t * bmzf = NULL;
// Source of keys
//fprintf(stderr, "Generating mphf %u in %u \n",cur_bucket + 1, brz->k);
if(nkeys_vd > max_size) max_size = nkeys_vd;
source = cmph_io_vector_adapter(keys_vd, (cmph_uint32)nkeys_vd);
config = cmph_config_new(source);
cmph_config_set_algo(config, CMPH_BMZ);
cmph_config_set_algo(config, CMPH_BMZ8);
cmph_config_set_graphsize(config, brz->c);
mphf_tmp = cmph_new(config);
bmzf = (bmz_data_t *)mphf_tmp->data;
//assert(brz_verify_mphf(mphf_tmp, source));
bmzf = (bmz8_data_t *)mphf_tmp->data;
brz_copy_partial_mphf(brz, bmzf, cur_bucket, source);
cmph_config_destroy(config);
brz_destroy_keys_vd(keys_vd, nkeys_vd);
@ -495,14 +414,12 @@ static int brz_gen_graphs(cmph_config_t *mph)
}
}
for(i = 0; i < nflushes; i++) fclose(tmp_fds[i]);
//flush_buffer(buffer, &memory_usage, graphs_fd);
free(tmp_fds);
free(keys_vd);
free(buffer_merge);
free(buffer_h3);
fprintf(stderr, "Maximal Size: %u\n", max_size);
return 1;
#pragma pack()
}
static cmph_uint32 brz_min_index(cmph_uint32 * vector, cmph_uint32 n)
@ -541,7 +458,7 @@ static void brz_destroy_keys_vd(char ** keys_vd, cmph_uint8 nkeys)
for(i = 0; i < nkeys; i++) free(keys_vd[i]);
}
static void brz_copy_partial_mphf(brz_config_data_t *brz, bmz_data_t * bmzf, cmph_uint32 index, cmph_io_adapter_t *source)
static void brz_copy_partial_mphf(brz_config_data_t *brz, bmz8_data_t * bmzf, cmph_uint32 index, cmph_io_adapter_t *source)
{
cmph_uint32 i;
cmph_uint32 n = ceil(brz->c * brz->size[index]);
@ -549,13 +466,11 @@ static void brz_copy_partial_mphf(brz_config_data_t *brz, bmz_data_t * bmzf, cmp
brz->g[index] = (cmph_uint8 *)calloc(n, sizeof(cmph_uint8));
for(i = 0; i < n; i++)
{
brz->g[index][i] = (cmph_uint8) bmzf->g[i];
brz->g[index][i] = bmzf->g[i];
//fprintf(stderr, "gsrc[%u]: %u gdest: %u\n", i, (cmph_uint8) bmzf->g[i], brz->g[index][i]);
}
brz->h1[index] = hash_state_copy(bmzf->hashes[0]);
brz->h2[index] = hash_state_copy(bmzf->hashes[1]);
//brz->size[index] = bmzf->n;
//assert(brz_verify_mphf1(brz->h1[index], brz->h2[index], brz->g[index], n, source));
}
int brz_dump(cmph_t *mphf, FILE *fd)
@ -675,11 +590,13 @@ cmph_uint32 brz_search(cmph_t *mphf, const char *key, cmph_uint32 keylen)
cmph_uint32 n = ceil(brz->c * m);
cmph_uint32 h1 = hash(brz->h1[h3], key, keylen) % n;
cmph_uint32 h2 = hash(brz->h2[h3], key, keylen) % n;
cmph_uint8 mphf_bucket;
if (h1 == h2 && ++h2 >= n) h2 = 0;
mphf_bucket = brz->g[h3][h1] + brz->g[h3][h2];
DEBUGP("key: %s h1: %u h2: %u h3: %u\n", key, h1, h2, h3);
DEBUGP("key: %s g[h1]: %u g[h2]: %u offset[h3]: %u edges: %u\n", key, brz->g[h3][h1], brz->g[h3][h2], brz->offset[h3], brz->m);
DEBUGP("Address: %u\n", (((cmph_uint32)brz->g[h3][h1] + (cmph_uint32)brz->g[h3][h2])% m + brz->offset[h3]));
return (((cmph_uint32)brz->g[h3][h1] + (cmph_uint32)brz->g[h3][h2])% m + brz->offset[h3]);
DEBUGP("Address: %u\n", mphf_bucket + brz->offset[h3]);
return (mphf_bucket + brz->offset[h3]);
}
void brz_destroy(cmph_t *mphf)
{

1
src/brz_structs.h
View File

@ -28,6 +28,7 @@ struct __brz_config_data_t
hash_state_t **h1;
hash_state_t **h2;
hash_state_t * h3;
cmph_uint32 memory_availability;
cmph_uint8 * tmp_dir; // temporary directory
};

4
src/cmph.c
View File

@ -173,10 +173,11 @@ void cmph_config_set_algo(cmph_config_t *mph, CMPH_ALGO algo)
mph->data = bmz_config_new();
break;
case CMPH_BMZ8:
mph->data = (void*)bmz8_config_new();
mph->data = bmz8_config_new();
break;
case CMPH_BRZ:
mph->data = brz_config_new();
break;
default:
assert(0);
}
@ -219,6 +220,7 @@ void cmph_config_destroy(cmph_config_t *mph)
break;
case CMPH_BRZ: /* included -- Fabiano */
brz_config_destroy(mph);
break;
default:
assert(0);
}