using less space to store the used_edges and critical_nodes arrays
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parent
03519cc9c8
commit
bda9c46618
26
src/bmz.c
26
src/bmz.c
@ -16,10 +16,16 @@
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static uint32 UNDEFINED = UINT_MAX;
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static const char bitmask[8] = { 1, 1 << 1, 1 << 2, 1 << 3, 1 << 4, 1 << 5, 1 << 6, 1 << 7 };
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#define GETBIT(array, i) (array[(i) / 8] & bitmask[(i) % 8])
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#define SETBIT(array, i) (array[(i) / 8] |= bitmask[(i) % 8])
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#define UNSETBIT(array, i) (array[(i) / 8] &= (~(bitmask[(i) % 8])))
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static int bmz_gen_edges(mph_t *mph);
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static void bmz_traverse_critical_nodes(bmz_mph_data_t *bmz, uint32 v, uint32 * biggest_g_value, uint32 * biggest_edge_value, uint8 * used_edges);
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static void bmz_traverse_non_critical_nodes(bmz_mph_data_t *bmz, uint8 * used_edges);
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mph_t *bmz_mph_new(key_source_t *key_source)
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{
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mph_t *mph = NULL;
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@ -70,7 +76,6 @@ mphf_t *bmz_mph_create(mph_t *mph, float bmz_c)
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uint32 i;
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uint32 iterations = 10;
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uint8 *used_edges = NULL;
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uint32 unused_edge_index = 0;
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uint32 biggest_g_value = 0;
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uint32 biggest_edge_value = 1;
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DEBUGP("bmz_c: %f\n", bmz_c);
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@ -131,12 +136,13 @@ mphf_t *bmz_mph_create(mph_t *mph, float bmz_c)
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// Searching step
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if (mph->verbosity)
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{
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fprintf(stderr, "Starting Searching step\n");
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fprintf(stderr, "Starting Searching step.\n");
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fprintf(stderr, "\tTraversing critical vertices.\n");
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}
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DEBUGP("Searching step\n");
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used_edges = (uint8 *)malloc(bmz->m*sizeof(uint8));
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memset(used_edges, 0, bmz->m);
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used_edges = (uint8 *)malloc((bmz->m*sizeof(uint8))/8 + 1);
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memset(used_edges, 0, bmz->m/8 + 1);
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free(bmz->g);
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bmz->g = malloc(bmz->n * sizeof(uint32));
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assert(bmz->g);
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@ -211,7 +217,7 @@ static void bmz_traverse_critical_nodes(bmz_mph_data_t *bmz, uint32 v, uint32 *
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if (graph_node_is_critical(bmz->graph, lav) && (bmz->g[lav] != UNDEFINED))
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{
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assert(next_g + bmz->g[lav] < bmz->m);
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if (used_edges[next_g + bmz->g[lav]])
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if (GETBIT(used_edges, next_g + bmz->g[lav]))
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{
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collision = 1;
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break;
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@ -226,7 +232,7 @@ static void bmz_traverse_critical_nodes(bmz_mph_data_t *bmz, uint32 v, uint32 *
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{
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if (graph_node_is_critical(bmz->graph, lav) && (bmz->g[lav] != UNDEFINED))
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{
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used_edges[next_g + bmz->g[lav]] = 1;
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SETBIT(used_edges,next_g + bmz->g[lav]);
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if(next_g + bmz->g[lav] > *biggest_edge_value) *biggest_edge_value = next_g + bmz->g[lav];
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}
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}
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@ -245,7 +251,7 @@ static uint32 next_unused_edge(bmz_mph_data_t *bmz, uint8 * used_edges, uint32 u
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while(1)
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{
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assert(unused_edge_index < bmz->m);
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if(used_edges[unused_edge_index]) unused_edge_index ++;
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if(GETBIT(used_edges, unused_edge_index)) unused_edge_index ++;
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else break;
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}
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return unused_edge_index;
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@ -259,16 +265,18 @@ static void bmz_traverse(bmz_mph_data_t *bmz, uint8 * used_edges, uint32 v, uint
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{
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DEBUGP("Visiting neighbor %u\n", neighbor);
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if(bmz->g[neighbor] != UNDEFINED) continue;
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*unused_edge_index = next_unused_edge(bmz, used_edges, *unused_edge_index + 1);
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*unused_edge_index = next_unused_edge(bmz, used_edges, *unused_edge_index);
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bmz->g[neighbor] = *unused_edge_index - bmz->g[v];
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(*unused_edge_index)++;
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bmz_traverse(bmz, used_edges, neighbor, unused_edge_index);
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}
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}
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static void bmz_traverse_non_critical_nodes(bmz_mph_data_t *bmz, uint8 * used_edges)
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{
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uint32 i, v1, v2, unused_edge_index = -1;
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uint32 i, v1, v2, unused_edge_index = 0;
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DEBUGP("Labelling non critical vertices\n");
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for(i = 0; i < bmz->m; i++)
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{
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36
src/graph.c
36
src/graph.c
@ -10,6 +10,11 @@
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//#define DEBUG
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#include "debug.h"
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static const char bitmask[8] = { 1, 1 << 1, 1 << 2, 1 << 3, 1 << 4, 1 << 5, 1 << 6, 1 << 7 };
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#define GETBIT(array, i) (array[(i) / 8] & bitmask[(i) % 8])
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#define SETBIT(array, i) (array[(i) / 8] |= bitmask[(i) % 8])
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#define UNSETBIT(array, i) (array[(i) / 8] &= (~(bitmask[(i) % 8])))
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#define abs_edge(e, i) (e % g->nedges + i * g->nedges)
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struct __graph_t
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@ -172,7 +177,7 @@ static int find_degree1_edge(graph_t *g, uint32 v, char *deleted, uint32 *e)
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char found = 0;
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DEBUGP("Checking degree of vertex %u\n", v);
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if (edge == EMPTY) return 0;
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else if (!deleted[abs_edge(edge, 0)])
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else if (!(GETBIT(deleted, abs_edge(edge, 0))))
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{
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found = 1;
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*e = edge;
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@ -181,7 +186,7 @@ static int find_degree1_edge(graph_t *g, uint32 v, char *deleted, uint32 *e)
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{
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edge = g->next[edge];
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if (edge == EMPTY) break;
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if (deleted[abs_edge(edge, 0)]) continue;
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if (GETBIT(deleted, abs_edge(edge, 0))) continue;
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if (found) return 0;
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DEBUGP("Found first edge\n");
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*e = edge;
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@ -203,7 +208,7 @@ static void cyclic_del_edge(graph_t *g, uint32 v, char *deleted)
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while(1)
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{
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DEBUGP("Deleting edge %u (%u->%u)\n", e, g->edges[abs_edge(e, 0)], g->edges[abs_edge(e, 1)]);
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deleted[abs_edge(e, 0)] = 1;
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SETBIT(deleted, abs_edge(e, 0));
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v2 = g->edges[abs_edge(e, 0)];
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if (v2 == v1) v2 = g->edges[abs_edge(e, 1)];
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@ -223,8 +228,8 @@ int graph_is_cyclic(graph_t *g)
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{
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uint32 i;
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uint32 v;
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char *deleted = (char *)malloc(g->nedges*sizeof(char));
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memset(deleted, 0, g->nedges);
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char *deleted = (char *)malloc((g->nedges*sizeof(char))/8 + 1);
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memset(deleted, 0, g->nedges/8 + 1);
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DEBUGP("Looking for cycles in graph with %u vertices and %u edges\n", g->nnodes, g->nedges);
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for (v = 0; v < g->nnodes; ++v)
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@ -233,7 +238,7 @@ int graph_is_cyclic(graph_t *g)
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}
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for (i = 0; i < g->nedges; ++i)
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{
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if (!(deleted[i]))
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if (!(GETBIT(deleted, i)))
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{
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DEBUGP("Edge %u %u->%u was not deleted\n", i, g->edges[i], g->edges[i + g->nedges]);
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free(deleted);
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@ -246,17 +251,16 @@ int graph_is_cyclic(graph_t *g)
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uint8 graph_node_is_critical(graph_t * g, uint32 v) /* included -- Fabiano */
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{
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return g->critical_nodes[v];
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return GETBIT(g->critical_nodes,v);
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}
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void graph_obtain_critical_nodes(graph_t *g) /* included -- Fabiano*/
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{
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uint32 i;
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uint32 v;
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char *deleted = (char *)malloc(g->nedges*sizeof(char));
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memset(deleted, 0, g->nedges);
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/* g->critical_nodes = (uint8 *)malloc((size_t)(ceil(g->nnodes*sizeof(uint8)/8.))); */
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g->critical_nodes = (uint8 *)malloc(g->nnodes*sizeof(uint8));
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char *deleted = (char *)malloc((g->nedges*sizeof(char))/8+1);
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memset(deleted, 0, g->nedges/8 + 1);
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g->critical_nodes = (uint8 *)malloc((g->nnodes*sizeof(uint8))/8 + 1);
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g->ncritical_nodes = 0;
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DEBUGP("Looking for the 2-core in graph with %u vertices and %u edges\n", g->nnodes, g->nedges);
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for (v = 0; v < g->nnodes; ++v)
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@ -266,18 +270,18 @@ void graph_obtain_critical_nodes(graph_t *g) /* included -- Fabiano*/
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for (i = 0; i < g->nedges; ++i)
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{
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if (!(deleted[i]))
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if (!(GETBIT(deleted,i)))
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{
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DEBUGP("Edge %u %u->%u belongs to the 2-core\n", i, g->edges[i], g->edges[i + g->nedges]);
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if(!(g->critical_nodes[g->edges[i]]))
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if(!(GETBIT(g->critical_nodes,g->edges[i])))
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{
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g->ncritical_nodes ++;
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g->critical_nodes[g->edges[i]] = 1;
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SETBIT(g->critical_nodes,g->edges[i]);
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}
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if(!(g->critical_nodes[g->edges[i + g->nedges]]))
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if(!(GETBIT(g->critical_nodes,g->edges[i + g->nedges])))
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{
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g->ncritical_nodes ++;
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g->critical_nodes[g->edges[i + g->nedges]] = 1;
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SETBIT(g->critical_nodes,g->edges[i + g->nedges]);
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}
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}
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}
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