1 /*
2 * Copyright (c) 2011, 2015, 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 * @bug 6173675
27 * @summary Basic test of ThreadMXBean.getThreadAllocatedBytes
28 * @author Paul Hohensee
29 * @modules jdk.management
30 */
31
32 import java.lang.management.*;
33
34 public class ThreadAllocatedMemory {
35 private static com.sun.management.ThreadMXBean mbean =
36 (com.sun.management.ThreadMXBean)ManagementFactory.getThreadMXBean();
37 private static boolean testFailed = false;
38 private static boolean done = false;
39 private static boolean done1 = false;
40 private static Object obj = new Object();
41 private static final int NUM_THREADS = 10;
42 private static Thread[] threads = new Thread[NUM_THREADS];
43 private static long[] sizes = new long[NUM_THREADS];
44
45 public static void main(String[] argv)
46 throws Exception {
47
48 if (!mbean.isThreadAllocatedMemorySupported()) {
49 return;
50 }
51
52 // disable allocated memory measurement
53 if (mbean.isThreadAllocatedMemoryEnabled()) {
54 mbean.setThreadAllocatedMemoryEnabled(false);
55 }
56
57 if (mbean.isThreadAllocatedMemoryEnabled()) {
58 throw new RuntimeException(
59 "ThreadAllocatedMemory is expected to be disabled");
60 }
61
62 Thread curThread = Thread.currentThread();
63 long id = curThread.getId();
64
65 long s = mbean.getThreadAllocatedBytes(id);
66 if (s != -1) {
67 throw new RuntimeException(
68 "Invalid ThreadAllocatedBytes returned = " +
69 s + " expected = -1");
70 }
71
72 // enable allocated memory measurement
73 if (!mbean.isThreadAllocatedMemoryEnabled()) {
74 mbean.setThreadAllocatedMemoryEnabled(true);
75 }
76
77 if (!mbean.isThreadAllocatedMemoryEnabled()) {
78 throw new RuntimeException(
79 "ThreadAllocatedMemory is expected to be enabled");
80 }
81
82 long size = mbean.getThreadAllocatedBytes(id);
83 // implementation could have started measurement when
84 // measurement was enabled, in which case size can be 0
85 if (size < 0) {
86 throw new RuntimeException(
87 "Invalid allocated bytes returned = " + size);
88 }
89
90 doit();
91
92 // Expected to be size1 >= size
93 long size1 = mbean.getThreadAllocatedBytes(id);
94 if (size1 < size) {
95 throw new RuntimeException("Allocated bytes " + size1 +
96 " expected >= " + size);
97 }
98 System.out.println(curThread.getName() +
99 " Current thread allocated bytes = " + size +
100 " allocated bytes = " + size1);
101
102
103 // start threads, wait for them to block
104 for (int i = 0; i < NUM_THREADS; i++) {
105 threads[i] = new MyThread("MyThread-" + i);
106 threads[i].start();
107 }
108
109 // threads block after doing some allocation
110 waitUntilThreadBlocked();
111
112 for (int i = 0; i < NUM_THREADS; i++) {
113 sizes[i] = mbean.getThreadAllocatedBytes(threads[i].getId());
114 }
115
116 // let threads go and do some more allocation
117 synchronized (obj) {
118 done = true;
119 obj.notifyAll();
120 }
121
122 // wait for threads to get going again. we don't care if we
123 // catch them in mid-execution or if some of them haven't
124 // restarted after we're done sleeping.
125 goSleep(400);
126
127 for (int i = 0; i < NUM_THREADS; i++) {
128 long newSize = mbean.getThreadAllocatedBytes(threads[i].getId());
129 if (sizes[i] > newSize) {
130 throw new RuntimeException("TEST FAILED: " +
131 threads[i].getName() +
132 " previous allocated bytes = " + sizes[i] +
133 " > current allocated bytes = " + newSize);
134 }
135 System.out.println(threads[i].getName() +
136 " Previous allocated bytes = " + sizes[i] +
137 " Current allocated bytes = " + newSize);
138 }
139
140 // let threads exit
141 synchronized (obj) {
142 done1 = true;
143 obj.notifyAll();
144 }
145
146 for (int i = 0; i < NUM_THREADS; i++) {
147 try {
148 threads[i].join();
149 } catch (InterruptedException e) {
150 System.out.println("Unexpected exception is thrown.");
151 e.printStackTrace(System.out);
152 testFailed = true;
153 break;
154 }
155 }
156 if (testFailed) {
157 throw new RuntimeException("TEST FAILED");
158 }
159
160 System.out.println("Test passed");
161 }
162
163
164 private static void goSleep(long ms) throws Exception {
165 try {
166 Thread.sleep(ms);
167 } catch (InterruptedException e) {
168 System.out.println("Unexpected exception is thrown.");
169 throw e;
170 }
171 }
172
173 private static void waitUntilThreadBlocked()
174 throws Exception {
175 int count = 0;
176 while (count != NUM_THREADS) {
177 goSleep(100);
178 count = 0;
179 for (int i = 0; i < NUM_THREADS; i++) {
180 ThreadInfo info = mbean.getThreadInfo(threads[i].getId());
181 if (info.getThreadState() == Thread.State.WAITING) {
182 count++;
183 }
184 }
185 }
186 }
187
188 public static void doit() {
189 String tmp = "";
190 long hashCode = 0;
191 for (int counter = 0; counter < 1000; counter++) {
192 tmp += counter;
193 hashCode = tmp.hashCode();
194 }
195 System.out.println(Thread.currentThread().getName() +
196 " hashcode: " + hashCode);
197 }
198
199 static class MyThread extends Thread {
200 public MyThread(String name) {
201 super(name);
202 }
203
204 public void run() {
205 ThreadAllocatedMemory.doit();
206
207 synchronized (obj) {
208 while (!done) {
209 try {
210 obj.wait();
211 } catch (InterruptedException e) {
212 System.out.println("Unexpected exception is thrown.");
213 e.printStackTrace(System.out);
214 testFailed = true;
215 break;
216 }
217 }
218 }
219
220 long size1 = mbean.getThreadAllocatedBytes(getId());
221 ThreadAllocatedMemory.doit();
222 long size2 = mbean.getThreadAllocatedBytes(getId());
223
224 System.out.println(getName() + ": " +
225 "ThreadAllocatedBytes = " + size1 +
226 " ThreadAllocatedBytes = " + size2);
227
228 if (size1 > size2) {
229 throw new RuntimeException("TEST FAILED: " + getName() +
230 " ThreadAllocatedBytes = " + size1 +
231 " > ThreadAllocatedBytes = " + size2);
232 }
233
234 synchronized (obj) {
235 while (!done1) {
236 try {
237 obj.wait();
238 } catch (InterruptedException e) {
239 System.out.println("Unexpected exception is thrown.");
240 e.printStackTrace(System.out);
241 testFailed = true;
242 break;
243 }
244 }
245 }
246 }
247 }
248 }