1 /*
2 * Copyright (c) 2011, 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.getThreadCpuTime(long[]) and
28 * getThreadUserTime(long[]).
29 * @author Paul Hohensee
30 */
31
32 import java.lang.management.*;
33
34 public class ThreadCpuTimeArray {
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 Object obj = new Object();
40 private static final int NUM_THREADS = 10;
41 private static Thread[] threads = new Thread[NUM_THREADS];
42
43 // careful about this value
44 private static final int DELTA = 100;
45
46 public static void main(String[] argv)
47 throws Exception {
48
49 if (!mbean.isThreadCpuTimeSupported()) {
50 return;
51 }
52
53
54 // disable CPU time
55 if (mbean.isThreadCpuTimeEnabled()) {
56 mbean.setThreadCpuTimeEnabled(false);
57 }
58
59 if (mbean.isThreadCpuTimeEnabled()) {
60 throw new RuntimeException("ThreadCpuTime is expected to be disabled");
61 }
62
63 // start threads, wait for them to block
64 long[] ids = new long[NUM_THREADS];
65
66 for (int i = 0; i < NUM_THREADS; i++) {
67 threads[i] = new MyThread("MyThread-" + i);
68 threads[i].start();
69 ids[i] = threads[i].getId();
70 }
71
72 // threads block after doing some computation
73 waitUntilThreadBlocked();
74
75
76 long times[] = mbean.getThreadCpuTime(ids);
77 long userTimes[] = mbean.getThreadUserTime(ids);
78
79 if (times == null) {
80 throw new RuntimeException("Null ThreadCpuTime array returned");
81 }
82
83 for (int i = 0; i < NUM_THREADS; i++) {
84 long t = times[i];
85 if (t != -1) {
86 throw new RuntimeException(
87 "Invalid ThreadCpuTime returned for thread " +
88 threads[i].getName() + " = " + t + " expected = -1");
89 }
90 long ut = userTimes[i];
91 if (ut != -1) {
92 throw new RuntimeException(
93 "Invalid ThreadUserTime returned for thread " +
94 threads[i].getName() + " = " + ut + " expected = -1");
95 }
96 }
97
98
99 // Enable CPU Time measurement
100 if (!mbean.isThreadCpuTimeEnabled()) {
101 mbean.setThreadCpuTimeEnabled(true);
102 }
103
104 if (!mbean.isThreadCpuTimeEnabled()) {
105 throw new RuntimeException("ThreadCpuTime is expected to be enabled");
106 }
107
108 times = mbean.getThreadCpuTime(ids);
109 userTimes = mbean.getThreadUserTime(ids);
110
111 goSleep(200);
112
113 for (int i = 0; i < NUM_THREADS; i++) {
114 long t = times[i];
115 if (t < 0) {
116 throw new RuntimeException(
117 "Invalid CPU time returned for thread " +
118 threads[i].getName() + " = " + t);
119 }
120 long ut = userTimes[i];
121 if (ut < 0) {
122 throw new RuntimeException(
123 "Invalid user time returned for thread " +
124 threads[i].getName() + " = " + ut);
125 }
126 }
127
128 long[] times1 = mbean.getThreadCpuTime(ids);
129 long[] userTimes1 = mbean.getThreadUserTime(ids);
130
131 for (int i = 0; i < NUM_THREADS; i++) {
132 long newTime = times1[i];
133 long newUserTime = userTimes1[i];
134
135 if (times[i] > newTime) {
136 throw new RuntimeException("TEST FAILED: " +
137 threads[i].getName() +
138 " previous CPU time = " + times[i] +
139 " > current CPU time = " + newTime);
140 }
141 if ((times[i] + DELTA) < newTime) {
142 throw new RuntimeException("TEST FAILED: " +
143 threads[i].getName() +
144 " CPU time = " + newTime +
145 " previous CPU time " + times[i] +
146 " out of expected range");
147 }
148
149 System.out.println(threads[i].getName() +
150 " Previous Cpu Time = " + times[i] +
151 " Current CPU time = " + newTime);
152
153 System.out.println(threads[i].getName() +
154 " Previous User Time = " + userTimes[i] +
155 " Current User time = " + newUserTime);
156 }
157
158
159 try {
160 times = mbean.getThreadCpuTime(null);
161 } catch (NullPointerException e) {
162 System.out.println(
163 "Caught expected NullPointerException: " + e.getMessage());
164 }
165
166 try {
167 ids[0] = 0;
168 times = mbean.getThreadCpuTime(ids);
169 } catch (IllegalArgumentException e) {
170 System.out.println(
171 "Caught expected IllegalArgumentException: " + e.getMessage());
172 }
173
174
175 // let threads exit
176 synchronized (obj) {
177 done = true;
178 obj.notifyAll();
179 }
180
181 for (int i = 0; i < NUM_THREADS; i++) {
182 try {
183 threads[i].join();
184 } catch (InterruptedException e) {
185 System.out.println("Unexpected exception is thrown.");
186 e.printStackTrace(System.out);
187 testFailed = true;
188 break;
189 }
190 }
191
192 if (testFailed) {
193 throw new RuntimeException("TEST FAILED");
194 }
195
196 System.out.println("Test passed");
197 }
198
199
200 private static void goSleep(long ms) throws Exception {
201 try {
202 Thread.sleep(ms);
203 } catch (InterruptedException e) {
204 System.out.println("Unexpected exception is thrown.");
205 throw e;
206 }
207 }
208
209 private static void waitUntilThreadBlocked()
210 throws Exception {
211 int count = 0;
212 while (count != NUM_THREADS) {
213 goSleep(100);
214 count = 0;
215 for (int i = 0; i < NUM_THREADS; i++) {
216 ThreadInfo info = mbean.getThreadInfo(threads[i].getId());
217 if (info.getThreadState() == Thread.State.WAITING) {
218 count++;
219 }
220 }
221 }
222 }
223
224 public static void doit() {
225 double sum = 0;
226 for (int i = 0; i < 5000; i++) {
227 double r = Math.random();
228 double x = Math.pow(3, r);
229 sum += x - r;
230 }
231 System.out.println(Thread.currentThread().getName() +
232 " sum = " + sum);
233 }
234
235 static class MyThread extends Thread {
236 public MyThread(String name) {
237 super(name);
238 }
239
240 public void run() {
241 ThreadCpuTimeArray.doit();
242
243 synchronized (obj) {
244 while (!done) {
245 try {
246 obj.wait();
247 } catch (InterruptedException e) {
248 System.out.println("Unexpected exception is thrown.");
249 e.printStackTrace(System.out);
250 testFailed = true;
251 break;
252 }
253 }
254 }
255
256 ThreadCpuTimeArray.doit();
257 }
258 }
259 }