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WTF

HashTable.cpp

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00001 /*
00002     Copyright (C) 2005 Apple Inc. All rights reserved.
00003 
00004     This library is free software; you can redistribute it and/or
00005     modify it under the terms of the GNU Library General Public
00006     License as published by the Free Software Foundation; either
00007     version 2 of the License, or (at your option) any later version.
00008 
00009     This library is distributed in the hope that it will be useful,
00010     but WITHOUT ANY WARRANTY; without even the implied warranty of
00011     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012     Library General Public License for more details.
00013 
00014     You should have received a copy of the GNU Library General Public License
00015     along with this library; see the file COPYING.LIB.  If not, write to
00016     the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
00017     Boston, MA 02110-1301, USA.
00018 */
00019 
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 } // namespace WTF

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