WTF
HashTable.cpp
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00020 #include "config.h"
00021 #include "HashTable.h"
00022
00023 namespace WTF {
00024
00025 #if DUMP_HASHTABLE_STATS
00026
00027 int HashTableStats::numAccesses;
00028 int HashTableStats::numCollisions;
00029 int HashTableStats::collisionGraph[4096];
00030 int HashTableStats::maxCollisions;
00031 int HashTableStats::numRehashes;
00032 int HashTableStats::numRemoves;
00033 int HashTableStats::numReinserts;
00034
00035 static HashTableStats logger;
00036
00037 HashTableStats::~HashTableStats()
00038 {
00039 printf("\nkhtml::HashTable statistics\n\n");
00040 printf("%d accesses\n", numAccesses);
00041 printf("%d total collisions, average %.2f probes per access\n", numCollisions, 1.0 * (numAccesses + numCollisions) / numAccesses);
00042 printf("longest collision chain: %d\n", maxCollisions);
00043 for (int i = 1; i <= maxCollisions; i++) {
00044 printf(" %d lookups with exactly %d collisions (%.2f%% , %.2f%% with this many or more)\n", collisionGraph[i], i, 100.0 * (collisionGraph[i] - collisionGraph[i+1]) / numAccesses, 100.0 * collisionGraph[i] / numAccesses);
00045 }
00046 printf("%d rehashes\n", numRehashes);
00047 printf("%d reinserts\n", numReinserts);
00048 }
00049
00050 void HashTableStats::recordCollisionAtCount(int count)
00051 {
00052 if (count > maxCollisions)
00053 maxCollisions = count;
00054 numCollisions++;
00055 collisionGraph[count]++;
00056 }
00057
00058 #endif
00059
00060 }