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HashTable.cpp
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1/*
2 Copyright (C) 2005 Apple Inc. All rights reserved.
3
4 This library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public
6 License as published by the Free Software Foundation; either
7 version 2 of the License, or (at your option) any later version.
8
9 This library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Library General Public License for more details.
13
14 You should have received a copy of the GNU Library General Public License
15 along with this library; see the file COPYING.LIB. If not, write to
16 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17 Boston, MA 02110-1301, USA.
18*/
19
20#include <config-kjs.h>
21#include "HashTable.h"
22
23namespace WTF {
24
25#if DUMP_HASHTABLE_STATS
26
27int HashTableStats::numAccesses;
28int HashTableStats::numCollisions;
29int HashTableStats::collisionGraph[4096];
30int HashTableStats::maxCollisions;
31int HashTableStats::numRehashes;
32int HashTableStats::numRemoves;
33int HashTableStats::numReinserts;
34
35static HashTableStats logger;
36
37HashTableStats::~HashTableStats()
38{
39 printf("\nkhtml::HashTable statistics\n\n");
40 printf("%d accesses\n", numAccesses);
41 printf("%d total collisions, average %.2f probes per access\n", numCollisions, 1.0 * (numAccesses + numCollisions) / numAccesses);
42 printf("longest collision chain: %d\n", maxCollisions);
43 for (int i = 1; i <= maxCollisions; i++) {
44 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);
45 }
46 printf("%d rehashes\n", numRehashes);
47 printf("%d reinserts\n", numReinserts);
48}
49
50void HashTableStats::recordCollisionAtCount(int count)
51{
52 if (count > maxCollisions)
53 maxCollisions = count;
54 numCollisions++;
55 collisionGraph[count]++;
56}
57
58#endif
59
60} // namespace WTF
HashTable.h
WTF
Definition: ASCIICType.h:45
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