1 /*
2 * Copyright (c) 2003, 2016, 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 * The -XX:MarkSweepAlwaysCompactCount=1 argument below makes sure serial gc
26 * compacts the heap at every full gc so that the usage is correctly updated.
27 */
28
29 /*
30 * @test
31 * @bug 4892507
32 * @summary Basic Test for MemoryPool.resetPeakUsage()
33 * @author Mandy Chung
34 *
35 * @requires vm.opt.ExplicitGCInvokesConcurrent != "true"
36 * @requires vm.opt.ExplicitGCInvokesConcurrentAndUnloadsClasses != "true"
37 * @requires vm.opt.DisableExplicitGC != "true"
38 * @library /lib/testlibrary/
39 * @modules jdk.management
40 *
41 * @build jdk.testlibrary.* ResetPeakMemoryUsage MemoryUtil RunUtil
42 * @run main ResetPeakMemoryUsage
43 */
44
45 import java.lang.management.*;
46 import java.lang.ref.WeakReference;
47 import java.util.*;
48
49 public class ResetPeakMemoryUsage {
50 private static MemoryMXBean mbean = ManagementFactory.getMemoryMXBean();
51 // make public so that it can't be optimized away easily
52 public static Object[] obj;
53
54 /**
55 * Run the test multiple times with different GC versions.
56 * First with default command line specified by the framework.
57 * Then with all GC versions specified by the test.
58 */
59 public static void main(String a[]) throws Throwable {
60 final String main = "ResetPeakMemoryUsage$TestMain";
61 final String ms = "-Xms256m";
62 final String mn = "-Xmn8m";
63 RunUtil.runTestClearGcOpts(main, ms, mn, "-XX:+UseConcMarkSweepGC");
64 RunUtil.runTestClearGcOpts(main, ms, mn, "-XX:+UseParallelGC");
65 RunUtil.runTestClearGcOpts(main, ms, mn, "-XX:+UseG1GC", "-XX:G1HeapRegionSize=1m");
66 RunUtil.runTestClearGcOpts(main, ms, mn, "-XX:+UseSerialGC",
67 "-XX:MarkSweepAlwaysCompactCount=1");
68 }
69
70 private static class TestMain {
71 public static void main(String[] argv) {
72 List pools = ManagementFactory.getMemoryPoolMXBeans();
73 ListIterator iter = pools.listIterator();
74 boolean found = false;
75 while (iter.hasNext()) {
76 MemoryPoolMXBean p = (MemoryPoolMXBean) iter.next();
77 // only check heap pools that support usage threshold
78 // this is typically only the old generation space
79 // since the other spaces are expected to get filled up
80 if (p.getType() == MemoryType.HEAP &&
81 p.isUsageThresholdSupported())
82 {
83 found = true;
84 testPool(p);
85 }
86 }
87 if (!found) {
88 throw new RuntimeException("No heap pool found");
89 }
90 }
91 }
92
93 private static void testPool(MemoryPoolMXBean mpool) {
94 System.out.println("Selected memory pool: ");
95 MemoryUtil.printMemoryPool(mpool);
96
97 MemoryUsage usage0 = mpool.getUsage();
98 MemoryUsage peak0 = mpool.getPeakUsage();
99
100 // use a size that is larger than the young generation and G1 regions
101 // to force the array into the old gen
102 int largeArraySize = 9 * 1000 * 1000;
103
104 System.out.println("Before big object array (of size "+largeArraySize+") is allocated: ");
105 printMemoryUsage(usage0, peak0);
106
107 obj = new Object[largeArraySize];
108 WeakReference<Object> weakRef = new WeakReference<>(obj);
109
110 MemoryUsage usage1 = mpool.getUsage();
111 MemoryUsage peak1 = mpool.getPeakUsage();
112 System.out.println("After the object is allocated: ");
113 printMemoryUsage(usage1, peak1);
114
115 if (usage1.getUsed() <= usage0.getUsed()) {
116 throw new RuntimeException(
117 formatSize("Before allocation: used", usage0.getUsed()) +
118 " expected to be < " +
119 formatSize("After allocation: used", usage1.getUsed()));
120 }
121
122 if (peak1.getUsed() <= peak0.getUsed()) {
123 throw new RuntimeException(
124 formatSize("Before allocation: peak", peak0.getUsed()) +
125 " expected to be < " +
126 formatSize("After allocation: peak", peak1.getUsed()));
127 }
128
129
130 // The object is now garbage and do a GC
131 // memory usage should drop
132 obj = null;
133
134 //This will cause sure shot GC unlike Runtime.gc() invoked by mbean.gc()
135 while(weakRef.get() != null) {
136 mbean.gc();
137 }
138
139 MemoryUsage usage2 = mpool.getUsage();
140 MemoryUsage peak2 = mpool.getPeakUsage();
141 System.out.println("After GC: ");
142 printMemoryUsage(usage2, peak2);
143
144 if (usage2.getUsed() >= usage1.getUsed()) {
145 throw new RuntimeException(
146 formatSize("Before GC: used", usage1.getUsed()) + " " +
147 " expected to be > " +
148 formatSize("After GC: used", usage2.getUsed()));
149 }
150
151 mpool.resetPeakUsage();
152
153 MemoryUsage usage3 = mpool.getUsage();
154 MemoryUsage peak3 = mpool.getPeakUsage();
155 System.out.println("After resetPeakUsage: ");
156 printMemoryUsage(usage3, peak3);
157
158 if (peak3.getUsed() != usage3.getUsed()) {
159 throw new RuntimeException(
160 formatSize("After resetting peak: peak", peak3.getUsed()) + " " +
161 " expected to be equal to " +
162 formatSize("current used", usage3.getUsed()));
163 }
164
165 if (peak3.getUsed() >= peak2.getUsed()) {
166 throw new RuntimeException(
167 formatSize("After resetting peak: peak", peak3.getUsed()) + " " +
168 " expected to be < " +
169 formatSize("previous peak", peak2.getUsed()));
170 }
171
172 System.out.println(RunUtil.successMessage);
173 }
174
175 private static String INDENT = " ";
176 private static void printMemoryUsage(MemoryUsage current, MemoryUsage peak) {
177 System.out.println("Current Usage: ");
178 MemoryUtil.printMemoryUsage(current);
179 System.out.println("Peak Usage: ");
180 MemoryUtil.printMemoryUsage(peak);
181
182 }
183 private static String formatSize(String name, long value) {
184 StringBuffer buf = new StringBuffer(name + " = " + value);
185 if (value > 0) {
186 buf.append(" (" + (value >> 10) + "K)");
187 }
188 return buf.toString();
189 }
190 }