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