1 /*
2 * Copyright (c) 2004, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 /*
25 * @test
26 * @key stress gc
27 *
28 * @summary converted from VM Testbase gc/gctests/PhantomReference/PhantomReferenceEvilTest.
29 * VM Testbase keywords: [gc, stress, stressopt, nonconcurrent, jrockit]
30 * VM Testbase readme:
31 * DESCRIPTION
32 * Test that verifies the PhantomReference handling in a more evil way.
33 * In this test, it will only keep every Xth object, thus causing more
34 * fragmentation and fill the heap with unused objects. This test should
35 * not throw any OOME during the test execution.
36 *
37 * COMMENTS
38 * This test was ported from JRockit test suite.
39 *
40 * @library /vmTestbase
41 * /test/lib
42 * @run driver jdk.test.lib.FileInstaller . .
43 * @run main/othervm
44 * -XX:-UseGCOverheadLimit
45 * gc.gctests.PhantomReference.PhantomReferenceEvilTest.PhantomReferenceEvilTest
46 */
47
48 package gc.gctests.PhantomReference.PhantomReferenceEvilTest;
49
50 import gc.gctests.PhantomReference.PhantomHelper;
51 import gc.gctests.PhantomReference.PRHelper;
52 import java.lang.ref.ReferenceQueue;
53 import java.util.ArrayList;
54 import java.util.Random;
55 import java.util.HashMap;
56 import nsk.share.TestFailure;
57 import nsk.share.gc.GC;
58 import nsk.share.gc.GCTestBase;
59 import nsk.share.gc.Memory;
60 import nsk.share.gc.gp.GarbageUtils;
61 import nsk.share.test.Stresser;
62
63 /**
64 * Tests for the PhantomReference handling in a more evil way.
65 *
66 * This test must be run with a mx value set to ensure
67 * Runtime.maxMemory() doesn't return 0.
68 */
69 public class PhantomReferenceEvilTest extends GCTestBase {
70
71 /**
72 * Test that verifies the PhantomReference handling in a more evil way.
73 * In this test, it will only keep every Xth object, thus causing more
74 * fragmentation and fill the heap with unused objects. This test should
75 * not throw any OOME during the test execution.
76 *
77 * @return success if all phantom references were enqueued
78 */
79 public final void run() {
80 long seed;
81 int minSize;
82 int maxSize;
83 int keepEveryXthObject;
84 double memPercentToFill;
85 long maxWaitTime;
86 long counter = 0;
87 long totalMemAlloced = 0;
88 long memToAlloc = 0;
89 long nrOfPrs = 0;
90 Runtime r = Runtime.getRuntime();
91
92
93 seed = runParams.getSeed();
94 minSize = 2048;
95 maxSize = 32768;
96 keepEveryXthObject = 5;
97 memPercentToFill = 0.45;
98 maxWaitTime = 30000;
99 memToAlloc = (long) (r.maxMemory() * memPercentToFill);
100 Random rndGenerator = new Random(seed);
101 long multiplier = maxSize - minSize;
102 ReferenceQueue rq = new ReferenceQueue();
103 HashMap hmHelper = new HashMap();
104 ArrayList alPhantomRefs = new ArrayList();
105
106 try {
107 try {
108 while (totalMemAlloced + Memory.getReferenceSize()
109 * hmHelper.size() < memToAlloc) {
110 int allocationSize = ((int) (rndGenerator.nextDouble()
111 * multiplier)) + minSize;
112 byte[] tmp = new byte[allocationSize];
113
114 if (counter % keepEveryXthObject == 0) {
115 Integer ik = new Integer(tmp.hashCode());
116 if (hmHelper.containsKey(ik)) {
117 PhantomHelper ph = (PhantomHelper) hmHelper.get(ik);
118 ph.increaseHashCounter();
119 hmHelper.put(ik, ph);
120 } else {
121 hmHelper.put(ik, new PhantomHelper(tmp.hashCode()));
122 }
123
124 PRHelper prh = new PRHelper(tmp, rq);
125 prh.setReferentHashCode(tmp.hashCode());
126 alPhantomRefs.add(prh);
127 totalMemAlloced +=
128 Memory.getArraySize(allocationSize, Memory.getByteSize())
129 + Memory.getReferenceSize()
130 + Memory.getReferenceObjectSize();
131
132 //Make sure the temporary object is dereferenced
133 prh = null;
134 nrOfPrs++;
135 }
136
137 // Make sure the temporary object is dereferenced
138 tmp = null;
139 counter++;
140 if (counter == Long.MAX_VALUE) {
141 counter = 0;
142 }
143 }
144 } catch (OutOfMemoryError oome) {
145 alPhantomRefs.clear();
146 hmHelper.clear();
147 log.info(nrOfPrs + " phantom refs had been allocated when "
148 + "OOME occured");
149 throw new TestFailure("OutOfMemoryException was thrown. This should "
150 + "not happen during the execution of this test.");
151 }
152
153
154 Stresser stresser = new Stresser(runParams.getStressOptions());
155 stresser.start(0);
156 GarbageUtils.eatMemory(stresser);
157 if (!stresser.continueExecution()) {
158 return; //we couldn't be sure that FullGC is triggered
159 }
160
161 String retInfo = PhantomHelper.checkAllHashCodes(
162 rq, hmHelper, maxWaitTime);
163 if (retInfo != null) {
164 alPhantomRefs.clear();
165 hmHelper.clear();
166 throw new TestFailure(retInfo);
167 }
168
169 log.info(nrOfPrs + " phantom refs were allocated during the test");
170 } finally {
171 // Make sure the ArrayList:s are live at the end of the test
172 // to make sure that the references gets enqueued.
173 alPhantomRefs.clear();
174 hmHelper.clear();
175 alPhantomRefs = null;
176 hmHelper = null;
177 }
178 }
179
180 public static void main(String[] args) {
181 GC.runTest(new PhantomReferenceEvilTest(), args);
182 }
183 }