VirtualBox

source: vbox/trunk/src/VBox/Runtime/testcase/tstRTStrCache.cpp@ 93654

Last change on this file since 93654 was 93115, checked in by vboxsync, 3 years ago

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1/* $Id: tstRTStrCache.cpp 93115 2022-01-01 11:31:46Z vboxsync $ */
2/** @file
3 * IPRT Testcase - StrCache.
4 */
5
6/*
7 * Copyright (C) 2009-2022 Oracle Corporation
8 *
9 * This file is part of VirtualBox Open Source Edition (OSE), as
10 * available from http://www.virtualbox.org. This file is free software;
11 * you can redistribute it and/or modify it under the terms of the GNU
12 * General Public License (GPL) as published by the Free Software
13 * Foundation, in version 2 as it comes in the "COPYING" file of the
14 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16 *
17 * The contents of this file may alternatively be used under the terms
18 * of the Common Development and Distribution License Version 1.0
19 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20 * VirtualBox OSE distribution, in which case the provisions of the
21 * CDDL are applicable instead of those of the GPL.
22 *
23 * You may elect to license modified versions of this file under the
24 * terms and conditions of either the GPL or the CDDL or both.
25 */
26
27
28/*********************************************************************************************************************************
29* Header Files *
30*********************************************************************************************************************************/
31#include <iprt/strcache.h>
32
33#include <iprt/asm.h>
34#include <iprt/ctype.h>
35#include <iprt/errcore.h>
36#include <iprt/initterm.h>
37#include <iprt/mem.h>
38#include <iprt/rand.h>
39#include <iprt/string.h>
40#include <iprt/test.h>
41#include <iprt/thread.h>
42#include <iprt/time.h>
43
44
45static void tstShowStats(RTSTRCACHE hStrCache)
46{
47 size_t cbStrings;
48 size_t cbChunks;
49 size_t cbBigEntries;
50 uint32_t cHashCollisions;
51 uint32_t cHashCollisions2;
52 uint32_t cHashInserts;
53 uint32_t cRehashes;
54 uint32_t cStrings = RTStrCacheGetStats(hStrCache, &cbStrings, &cbChunks, &cbBigEntries,
55 &cHashCollisions, &cHashCollisions2, &cHashInserts, &cRehashes);
56 if (cbStrings == UINT32_MAX)
57 {
58 RTTESTI_CHECK(!RTStrCacheIsRealImpl());
59 return;
60 }
61
62 RTTestIValue("Strings", cStrings, RTTESTUNIT_OCCURRENCES);
63 RTTestIValue("Memory overhead", (uint64_t)(cbChunks + cbBigEntries - cbStrings) * 100 / cbStrings, RTTESTUNIT_PCT);
64 if (cHashInserts > 0)
65 {
66 RTTestIValue("Collisions", (uint64_t)cHashCollisions * 100 / cHashInserts, RTTESTUNIT_PCT);
67 RTTestIValue("Collisions2", (uint64_t)cHashCollisions2 * 100 / cHashInserts, RTTESTUNIT_PCT);
68 }
69 RTTestIPrintf(RTTESTLVL_ALWAYS, "cHashInserts=%u cHashCollisions=%u cHashCollisions2=%u cRehashes=%u\n",
70 cHashInserts, cHashCollisions, cHashCollisions2, cRehashes);
71 RTTestIPrintf(RTTESTLVL_ALWAYS, "cbChunks=%zu cbBigEntries=%zu cbStrings=%zu\n", cbChunks, cbBigEntries, cbStrings);
72}
73
74
75/**
76 * Check hash and memory performance.
77 */
78static void tst2(void)
79{
80 RTTestISub("Hash performance");
81
82 /*
83 * Generate test strings using a specific pseudo random generator.
84 */
85 size_t cbStrings = 0;
86 char *apszTests[8192];
87 RTRAND hRand;
88 RTTESTI_CHECK_RC_RETV(RTRandAdvCreateParkMiller(&hRand), VINF_SUCCESS);
89 for (uint32_t i = 0; i < 8192; i++)
90 {
91 char szBuf[8192];
92 uint32_t cch = RTRandAdvU32Ex(hRand, 3, sizeof(szBuf) - 1);
93 RTRandAdvBytes(hRand, szBuf, cch);
94 szBuf[cch] = '\0';
95 for (uint32_t off = 0; off < cch; off++)
96 {
97 uint8_t b = szBuf[off];
98 b &= 0x7f;
99 if (!b || b == 0x7f)
100 b = ' ';
101 else if (RTLocCIsCntrl(b) && b != '\n' && b != '\r' && b != '\t')
102 b += 0x30;
103 szBuf[off] = b;
104 }
105 apszTests[i] = (char *)RTMemDup(szBuf, cch + 1);
106 RTTESTI_CHECK_RETV(apszTests[i] != NULL);
107 cbStrings += cch + 1;
108 }
109 RTRandAdvDestroy(hRand);
110 RTTestIValue("Average string", cbStrings / RT_ELEMENTS(apszTests), RTTESTUNIT_BYTES);
111
112 /*
113 * Test new insertion first time around.
114 */
115 RTSTRCACHE hStrCache;
116 RTTESTI_CHECK_RC_RETV(RTStrCacheCreate(&hStrCache, "hash performance"), VINF_SUCCESS);
117
118 uint64_t nsTsStart = RTTimeNanoTS();
119 for (uint32_t i = 0; i < RT_ELEMENTS(apszTests); i++)
120 RTTESTI_CHECK_RETV(RTStrCacheEnter(hStrCache, apszTests[i]) != NULL);
121 uint64_t cNsElapsed = RTTimeNanoTS() - nsTsStart;
122 RTTestIValue("First insert", cNsElapsed / RT_ELEMENTS(apszTests), RTTESTUNIT_NS_PER_CALL);
123
124 /*
125 * Insert existing strings.
126 */
127 nsTsStart = RTTimeNanoTS();
128 for (uint32_t i = 0; i < 8192; i++)
129 RTTESTI_CHECK(RTStrCacheEnter(hStrCache, apszTests[i]) != NULL);
130 cNsElapsed = RTTimeNanoTS() - nsTsStart;
131 RTTestIValue("Duplicate insert", cNsElapsed / RT_ELEMENTS(apszTests), RTTESTUNIT_NS_PER_CALL);
132
133 tstShowStats(hStrCache);
134 RTTESTI_CHECK_RC(RTStrCacheDestroy(hStrCache), VINF_SUCCESS);
135
136 for (uint32_t i = 0; i < 8192; i++)
137 RTMemFree(apszTests[i]);
138}
139
140
141/**
142 * Basic API checks.
143 * We'll return if any of these fails.
144 */
145static void tst1(RTSTRCACHE hStrCache)
146{
147 const char *psz;
148
149 /* Simple string entering and length. */
150 RTTESTI_CHECK_RETV(psz = RTStrCacheEnter(hStrCache, "abcdefgh"));
151 RTTESTI_CHECK_RETV(strcmp(psz, "abcdefgh") == 0);
152 RTTESTI_CHECK_RETV(RTStrCacheLength(psz) == strlen("abcdefgh"));
153 RTTESTI_CHECK_RETV(RTStrCacheRelease(hStrCache, psz) == 0);
154
155 RTTESTI_CHECK_RETV(psz = RTStrCacheEnter(hStrCache, "abcdefghijklmnopqrstuvwxyz"));
156 RTTESTI_CHECK_RETV(strcmp(psz, "abcdefghijklmnopqrstuvwxyz") == 0);
157 RTTESTI_CHECK_RETV(RTStrCacheLength(psz) == strlen("abcdefghijklmnopqrstuvwxyz"));
158 RTTESTI_CHECK_RETV(RTStrCacheRelease(hStrCache, psz) == 0);
159
160 /* Unterminated strings. */
161 RTTESTI_CHECK_RETV(psz = RTStrCacheEnterN(hStrCache, "0123456789", 3));
162 RTTESTI_CHECK_RETV(strcmp(psz, "012") == 0);
163 RTTESTI_CHECK_RETV(RTStrCacheLength(psz) == strlen("012"));
164 RTTESTI_CHECK_RETV(RTStrCacheRelease(hStrCache, psz) == 0);
165
166 RTTESTI_CHECK_RETV(psz = RTStrCacheEnterN(hStrCache, "0123456789abcdefghijklmnopqrstuvwxyz", 16));
167 RTTESTI_CHECK_RETV(strcmp(psz, "0123456789abcdef") == 0);
168 RTTESTI_CHECK_RETV(RTStrCacheLength(psz) == strlen("0123456789abcdef"));
169 RTTESTI_CHECK_RETV(RTStrCacheRelease(hStrCache, psz) == 0);
170
171 /* String referencing. */
172 char szTest[4096+16];
173 memset(szTest, 'a', sizeof(szTest));
174 char szTest2[4096+16];
175 memset(szTest2, 'f', sizeof(szTest));
176 for (int32_t i = 4096; i > 3; i /= 3)
177 {
178 void *pv2;
179 RTTESTI_CHECK_RETV(psz = RTStrCacheEnterN(hStrCache, szTest, i));
180 RTTESTI_CHECK_MSG_RETV((pv2 = ASMMemFirstMismatchingU8(psz, i, 'a')) == NULL && !psz[i], ("i=%#x psz=%p off=%#x\n", i, psz, (uintptr_t)pv2 - (uintptr_t)psz));
181 RTTESTI_CHECK(RTStrCacheRetain(psz) == 2);
182 RTTESTI_CHECK(RTStrCacheRetain(psz) == 3);
183 RTTESTI_CHECK(RTStrCacheRetain(psz) == 4);
184 RTTESTI_CHECK_MSG_RETV((pv2 = ASMMemFirstMismatchingU8(psz, i, 'a')) == NULL && !psz[i], ("i=%#x psz=%p off=%#x\n", i, psz, (uintptr_t)pv2 - (uintptr_t)psz));
185 RTTESTI_CHECK(RTStrCacheRelease(hStrCache, psz) == 3);
186 RTTESTI_CHECK_MSG_RETV((pv2 = ASMMemFirstMismatchingU8(psz, i, 'a')) == NULL && !psz[i], ("i=%#x psz=%p off=%#x\n", i, psz, (uintptr_t)pv2 - (uintptr_t)psz));
187 RTTESTI_CHECK(RTStrCacheRetain(psz) == 4);
188 RTTESTI_CHECK(RTStrCacheRetain(psz) == 5);
189 RTTESTI_CHECK(RTStrCacheRetain(psz) == 6);
190 RTTESTI_CHECK(RTStrCacheRelease(hStrCache, psz) == 5);
191 RTTESTI_CHECK(RTStrCacheRelease(hStrCache, psz) == 4);
192 RTTESTI_CHECK_MSG_RETV((pv2 = ASMMemFirstMismatchingU8(psz, i, 'a')) == NULL && !psz[i], ("i=%#x psz=%p off=%#x\n", i, psz, (uintptr_t)pv2 - (uintptr_t)psz));
193
194 for (uint32_t cRefs = 3;; cRefs--)
195 {
196 RTTESTI_CHECK(RTStrCacheRelease(hStrCache, psz) == cRefs);
197 if (cRefs == 0)
198 break;
199 RTTESTI_CHECK_MSG_RETV((pv2 = ASMMemFirstMismatchingU8(psz, i, 'a')) == NULL && !psz[i], ("i=%#x psz=%p off=%#x cRefs=%d\n", i, psz, (uintptr_t)pv2 - (uintptr_t)psz, cRefs));
200 for (uint32_t j = 0; j < 42; j++)
201 {
202 const char *psz2;
203 RTTESTI_CHECK_RETV(psz2 = RTStrCacheEnterN(hStrCache, szTest2, i));
204 RTTESTI_CHECK_RETV(psz2 != psz);
205 RTTESTI_CHECK(RTStrCacheRelease(hStrCache, psz2) == 0);
206 RTTESTI_CHECK_MSG_RETV((pv2 = ASMMemFirstMismatchingU8(psz, i, 'a')) == NULL && !psz[i], ("i=%#x psz=%p off=%#x cRefs=%d\n", i, psz, (uintptr_t)pv2 - (uintptr_t)psz, cRefs));
207 }
208 }
209 }
210
211 /* Lots of allocations. */
212 memset(szTest, 'b', sizeof(szTest));
213 memset(szTest2, 'e', sizeof(szTest));
214 const char *pszTest1Rets[4096 + 16];
215 const char *pszTest2Rets[4096 + 16];
216 for (uint32_t i = 1; i < RT_ELEMENTS(pszTest1Rets); i++)
217 {
218 RTTESTI_CHECK(pszTest1Rets[i] = RTStrCacheEnterN(hStrCache, szTest, i));
219 RTTESTI_CHECK(strlen(pszTest1Rets[i]) == i);
220 RTTESTI_CHECK(pszTest2Rets[i] = RTStrCacheEnterN(hStrCache, szTest2, i));
221 RTTESTI_CHECK(strlen(pszTest2Rets[i]) == i);
222 }
223
224 if (RTStrCacheIsRealImpl())
225 {
226 for (uint32_t i = 1; i < RT_ELEMENTS(pszTest1Rets); i++)
227 {
228 uint32_t cRefs;
229 const char *psz1, *psz2;
230 RTTESTI_CHECK((psz1 = RTStrCacheEnterN(hStrCache, szTest, i)) == pszTest1Rets[i]);
231 RTTESTI_CHECK((psz2 = RTStrCacheEnterN(hStrCache, szTest2, i)) == pszTest2Rets[i]);
232 RTTESTI_CHECK_MSG((cRefs = RTStrCacheRelease(hStrCache, psz1)) == 1, ("cRefs=%#x i=%#x\n", cRefs, i));
233 RTTESTI_CHECK_MSG((cRefs = RTStrCacheRelease(hStrCache, psz2)) == 1, ("cRefs=%#x i=%#x\n", cRefs, i));
234 }
235 }
236
237 for (uint32_t i = 1; i < RT_ELEMENTS(pszTest1Rets); i++)
238 {
239 uint32_t cRefs;
240 RTTESTI_CHECK(strlen(pszTest1Rets[i]) == i);
241 RTTESTI_CHECK_MSG((cRefs = RTStrCacheRelease(hStrCache, pszTest1Rets[i])) == 0, ("cRefs=%#x i=%#x\n", cRefs, i));
242 RTTESTI_CHECK(strlen(pszTest2Rets[i]) == i);
243 RTTESTI_CHECK_MSG((cRefs = RTStrCacheRelease(hStrCache, pszTest2Rets[i])) == 0, ("cRefs=%#x i=%#x\n", cRefs, i));
244 }
245}
246
247
248int main()
249{
250 RTTEST hTest;
251 int rc = RTTestInitAndCreate("tstRTStrCache", &hTest);
252 if (rc)
253 return rc;
254 RTTestBanner(hTest);
255
256 /*
257 * Smoke tests using first the default and then a custom pool.
258 */
259 RTTestSub(hTest, "Smoke test on default cache");
260 tst1(RTSTRCACHE_DEFAULT);
261
262 RTTestSub(hTest, "Smoke test on custom cache");
263 RTSTRCACHE hStrCache;
264 RTTESTI_CHECK_RC(rc = RTStrCacheCreate(&hStrCache, "test 2a"), VINF_SUCCESS);
265 if (RT_SUCCESS(rc))
266 RTTESTI_CHECK_RC(rc = RTStrCacheDestroy(hStrCache), VINF_SUCCESS);
267 RTTESTI_CHECK_RC(rc = RTStrCacheDestroy(NIL_RTSTRCACHE), VINF_SUCCESS);
268 RTTESTI_CHECK_RC(rc = RTStrCacheDestroy(RTSTRCACHE_DEFAULT), VINF_SUCCESS);
269 RTTESTI_CHECK_RC(rc = RTStrCacheDestroy(RTSTRCACHE_DEFAULT), VINF_SUCCESS);
270
271 RTTESTI_CHECK_RC(rc = RTStrCacheCreate(&hStrCache, "test 2b"), VINF_SUCCESS);
272 if (RT_SUCCESS(rc))
273 {
274 tst1(hStrCache);
275 RTTESTI_CHECK_RC(rc = RTStrCacheDestroy(hStrCache), VINF_SUCCESS);
276 }
277
278 /*
279 * Cache performance on relatively real world examples.
280 */
281 tst2();
282
283 /*
284 * Summary.
285 */
286 return RTTestSummaryAndDestroy(hTest);
287}
288
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