1 /*
2 * Copyright (c) 2011, 2019, 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 */
30
31 import java.lang.management.*;
32
33 public class ThreadAllocatedMemory {
34 private static com.sun.management.ThreadMXBean mbean =
35 (com.sun.management.ThreadMXBean)ManagementFactory.getThreadMXBean();
36 private static boolean testFailed = false;
37 private static volatile boolean done = false;
38 private static volatile boolean done1 = false;
39 private static Object obj = new Object();
40 private static final int NUM_THREADS = 10;
41 private static Thread[] threads = new Thread[NUM_THREADS];
42 private static long[] sizes = new long[NUM_THREADS];
43
44 public static void main(String[] argv)
45 throws Exception {
46
47 if (!mbean.isThreadAllocatedMemorySupported()) {
48 return;
49 }
50
51 // disable allocated memory measurement
52 if (mbean.isThreadAllocatedMemoryEnabled()) {
53 mbean.setThreadAllocatedMemoryEnabled(false);
54 }
55
56 if (mbean.isThreadAllocatedMemoryEnabled()) {
57 throw new RuntimeException(
58 "ThreadAllocatedMemory is expected to be disabled");
59 }
60
61 Thread curThread = Thread.currentThread();
62 long id = curThread.getId();
63
64 long s = mbean.getThreadAllocatedBytes(id);
65 if (s != -1) {
66 throw new RuntimeException(
67 "Invalid ThreadAllocatedBytes returned = " +
68 s + " expected = -1");
69 }
70
71 // enable allocated memory measurement
72 if (!mbean.isThreadAllocatedMemoryEnabled()) {
73 mbean.setThreadAllocatedMemoryEnabled(true);
74 }
75
76 if (!mbean.isThreadAllocatedMemoryEnabled()) {
77 throw new RuntimeException(
78 "ThreadAllocatedMemory is expected to be enabled");
79 }
80
81
82 // Test current thread two ways
83
84
85 // First way, getCurrentThreadAllocatedBytes
86
87 long size = mbean.getCurrentThreadAllocatedBytes();
88 // implementation could have started measurement when
89 // measurement was enabled, in which case size can be 0
90 if (size < 0) {
91 throw new RuntimeException(
92 "Invalid allocated bytes returned = " + size);
93 }
94
95 doit();
96
97 // Expected to be size1 >= size
98 long size1 = mbean.getThreadAllocatedBytes(id);
99 if (size1 < size) {
100 throw new RuntimeException("Allocated bytes " + size1 +
101 " expected >= " + size);
102 }
103 System.out.println(curThread.getName() +
104 " Previous allocated bytes = " + size +
105 " Current allocated bytes = " + size1);
106
107 // back-to-back calls shouldn't allocate any memory
108 size = mbean.getCurrentThreadAllocatedBytes();
109 size1 = mbean.getCurrentThreadAllocatedBytes();
110 if (size1 != size) {
111 throw new RuntimeException("Allocated bytes " + size1 +
112 " expected == " + size);
113 }
114 System.out.println(curThread.getName() +
115 " Previous allocated bytes = " + size +
116 " Current allocated bytes = " + size1);
117
118
119 // Second way, getThreadAllocatedBytes
120
121 size = mbean.getThreadAllocatedBytes(id);
122 // implementation could have started measurement when
123 // measurement was enabled, in which case size can be 0
124 if (size < 0) {
125 throw new RuntimeException(
126 "Invalid allocated bytes returned = " + size);
127 }
128
129 doit();
130
131 // Expected to be size1 >= size
132 size1 = mbean.getThreadAllocatedBytes(id);
133 if (size1 < size) {
134 throw new RuntimeException("Allocated bytes " + size1 +
135 " expected >= " + size);
136 }
137 System.out.println(curThread.getName() +
138 " Previous allocated bytes = " + size +
139 " Current allocated bytes = " + size1);
140
141 // back-to-back calls shouldn't allocate any memory
142 size = mbean.getThreadAllocatedBytes(id);
143 size1 = mbean.getThreadAllocatedBytes(id);
144 if (size1 != size) {
145 throw new RuntimeException("Allocated bytes " + size1 +
146 " expected == " + size);
147 }
148 System.out.println(curThread.getName() +
149 " Previous allocated bytes = " + size +
150 " Current allocated bytes = " + size1);
151
152
153 // Test a single thread that isn't ourself
154
155 // Start one thread, wait for it to block
156 // after doing some allocation
157 done = false; done1 = false;
158 curThread = new MyThread("MyThread");
159 curThread.start();
160 id = curThread.getId();
161 waitUntilThreadBlocked(curThread);
162 size = mbean.getThreadAllocatedBytes(id);
163
164 // let thread go to do some more allocation
165 synchronized (obj) {
166 done = true;
167 obj.notifyAll();
168 }
169
170 // wait for thread to get going again and sample it
171 goSleep(400);
172 size1 = mbean.getThreadAllocatedBytes(id);
173 if (size > size1) {
174 throw new RuntimeException(
175 curThread.getName() +
176 " previous allocated bytes = " + size +
177 " > current allocated bytes = " + size1);
178 }
179 System.out.println(curThread.getName() +
180 " Previous allocated bytes = " + size +
181 " Current allocated bytes = " + size1);
182
183 // let thread exit
184 synchronized (obj) {
185 done1 = true;
186 obj.notifyAll();
187 }
188
189 try {
190 curThread.join();
191 } catch (InterruptedException e) {
192 System.out.println("Unexpected exception is thrown.");
193 e.printStackTrace(System.out);
194 testFailed = true;
195 }
196 if (testFailed) {
197 throw new RuntimeException("TEST FAILED");
198 }
199
200
201 // Test many threads
202
203 // start threads, wait for them to block
204 done = false; done1 = false;
205 for (int i = 0; i < NUM_THREADS; i++) {
206 threads[i] = new MyThread("MyThread-" + i);
207 threads[i].start();
208 }
209
210 // threads block after doing some allocation
211 waitUntilThreadsBlocked();
212
213 for (int i = 0; i < NUM_THREADS; i++) {
214 sizes[i] = mbean.getThreadAllocatedBytes(threads[i].getId());
215 }
216
217 // let threads go and do some more allocation
218 synchronized (obj) {
219 done = true;
220 obj.notifyAll();
221 }
222
223 // wait for threads to get going again. we don't care if we
224 // catch them in mid-execution or if some of them haven't
225 // restarted after we're done sleeping.
226 goSleep(400);
227
228 for (int i = 0; i < NUM_THREADS; i++) {
229 long newSize = mbean.getThreadAllocatedBytes(threads[i].getId());
230 if (sizes[i] > newSize) {
231 throw new RuntimeException(
232 threads[i].getName() +
233 " previous allocated bytes = " + sizes[i] +
234 " > current allocated bytes = " + newSize);
235 }
236 System.out.println(threads[i].getName() +
237 " Previous allocated bytes = " + sizes[i] +
238 " Current allocated bytes = " + newSize);
239 }
240
241 // let threads exit
242 synchronized (obj) {
243 done1 = true;
244 obj.notifyAll();
245 }
246
247 for (int i = 0; i < NUM_THREADS; i++) {
248 try {
249 threads[i].join();
250 } catch (InterruptedException e) {
251 System.out.println("Unexpected exception is thrown.");
252 e.printStackTrace(System.out);
253 testFailed = true;
254 break;
255 }
256 }
257 if (testFailed) {
258 throw new RuntimeException("TEST FAILED");
259 }
260
261
262 System.out.println("Test passed");
263 }
264
265
266 private static void goSleep(long ms) throws Exception {
267 try {
268 Thread.sleep(ms);
269 } catch (InterruptedException e) {
270 System.out.println("Unexpected exception is thrown.");
271 throw e;
272 }
273 }
274
275 private static void waitUntilThreadBlocked(Thread thread)
276 throws Exception {
277 while (true) {
278 goSleep(100);
279 ThreadInfo info = mbean.getThreadInfo(thread.getId());
280 if (info.getThreadState() == Thread.State.WAITING) {
281 break;
282 }
283 }
284 }
285
286 private static void waitUntilThreadsBlocked()
287 throws Exception {
288 int count = 0;
289 while (count != NUM_THREADS) {
290 goSleep(100);
291 count = 0;
292 for (int i = 0; i < NUM_THREADS; i++) {
293 ThreadInfo info = mbean.getThreadInfo(threads[i].getId());
294 if (info.getThreadState() == Thread.State.WAITING) {
295 count++;
296 }
297 }
298 }
299 }
300
301 public static void doit() {
302 String tmp = "";
303 long hashCode = 0;
304 for (int counter = 0; counter < 1000; counter++) {
305 tmp += counter;
306 hashCode = tmp.hashCode();
307 }
308 System.out.println(Thread.currentThread().getName() +
309 " hashcode: " + hashCode);
310 }
311
312 static class MyThread extends Thread {
313 public MyThread(String name) {
314 super(name);
315 }
316
317 public void run() {
318 ThreadAllocatedMemory.doit();
319
320 synchronized (obj) {
321 while (!done) {
322 try {
323 obj.wait();
324 } catch (InterruptedException e) {
325 System.out.println("Unexpected exception is thrown.");
326 e.printStackTrace(System.out);
327 testFailed = true;
328 break;
329 }
330 }
331 }
332
333 long size1 = mbean.getThreadAllocatedBytes(getId());
334 ThreadAllocatedMemory.doit();
335 long size2 = mbean.getThreadAllocatedBytes(getId());
336
337 System.out.println(getName() + ": " +
338 "ThreadAllocatedBytes = " + size1 +
339 " ThreadAllocatedBytes = " + size2);
340
341 if (size1 > size2) {
342 throw new RuntimeException(getName() +
343 " ThreadAllocatedBytes = " + size1 +
344 " > ThreadAllocatedBytes = " + size2);
345 }
346
347 synchronized (obj) {
348 while (!done1) {
349 try {
350 obj.wait();
351 } catch (InterruptedException e) {
352 System.out.println("Unexpected exception is thrown.");
353 e.printStackTrace(System.out);
354 testFailed = true;
355 break;
356 }
357 }
358 }
359 }
360 }
361 }