1 /*
   2  * Copyright (c) 2003, 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     4530538
  27  * @summary Basic test of ThreadMXBean.getThreadCpuTime and
  28  *          getCurrentThreadCpuTime.
  29  * @author  Mandy Chung
  30  * @modules java.management
  31  */
  32 
  33 import java.lang.management.*;
  34 
  35 public class ThreadCpuTime {
  36     private static ThreadMXBean mbean = 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     private static long[] times = new long[NUM_THREADS];
  43 
  44     // careful about this value
  45     private static final int DELTA = 100;
  46 
  47     public static void main(String[] argv)
  48         throws Exception {
  49         if (!mbean.isCurrentThreadCpuTimeSupported()) {
  50             return;
  51         }
  52 
  53        // disable CPU time
  54         if (mbean.isThreadCpuTimeEnabled()) {
  55             mbean.setThreadCpuTimeEnabled(false);
  56         }
  57 
  58         Thread curThread = Thread.currentThread();
  59         long t = mbean.getCurrentThreadCpuTime();
  60         if (t != -1) {
  61             throw new RuntimeException("Invalid CurrenThreadCpuTime returned = " +
  62                 t + " expected = -1");
  63         }
  64 
  65         if (mbean.isThreadCpuTimeSupported()) {
  66             long t1 = mbean.getThreadCpuTime(curThread.getId());
  67             if (t1 != -1) {
  68                 throw new RuntimeException("Invalid ThreadCpuTime returned = " +
  69                     t1 + " expected = -1");
  70             }
  71         }
  72 
  73         // Enable CPU Time measurement
  74         if (!mbean.isThreadCpuTimeEnabled()) {
  75             mbean.setThreadCpuTimeEnabled(true);
  76         }
  77 
  78         if (!mbean.isThreadCpuTimeEnabled()) {
  79             throw new RuntimeException("ThreadCpuTime is expected to be enabled");
  80         }
  81 
  82         long time = mbean.getCurrentThreadCpuTime();
  83         if (time < 0) {
  84             throw new RuntimeException("Invalid CPU time returned = " + time);
  85         }
  86 
  87         if (!mbean.isThreadCpuTimeSupported()) {
  88             return;
  89         }
  90 
  91 
  92         // Expected to be time1 >= time
  93         long time1 = mbean.getThreadCpuTime(curThread.getId());
  94         if (time1 < time) {
  95             throw new RuntimeException("CPU time " + time1 +
  96                 " expected >= " + time);
  97         }
  98         System.out.println(curThread.getName() +
  99             " Current Thread Cpu Time = " + time +
 100             " CPU time = " + time1);
 101 
 102         for (int i = 0; i < NUM_THREADS; i++) {
 103             threads[i] = new MyThread("MyThread-" + i);
 104             threads[i].start();
 105         }
 106 
 107         waitUntilThreadBlocked();
 108 
 109         for (int i = 0; i < NUM_THREADS; i++) {
 110             times[i] = mbean.getThreadCpuTime(threads[i].getId());
 111         }
 112 
 113         goSleep(200);
 114 
 115         for (int i = 0; i < NUM_THREADS; i++) {
 116             long newTime = mbean.getThreadCpuTime(threads[i].getId());
 117             if (times[i] > newTime) {
 118                 throw new RuntimeException("TEST FAILED: " +
 119                     threads[i].getName() +
 120                     " previous CPU time = " + times[i] +
 121                     " > current CPU time = " + newTime);
 122             }
 123             if ((times[i] + DELTA) < newTime) {
 124                 throw new RuntimeException("TEST FAILED: " +
 125                     threads[i].getName() +
 126                     " CPU time = " + newTime +
 127                     " previous CPU time " + times[i] +
 128                     " out of expected range");
 129             }
 130 
 131             System.out.println(threads[i].getName() +
 132                 " Previous Cpu Time = " + times[i] +
 133                 " Current CPU time = " + newTime);
 134         }
 135 
 136         synchronized (obj) {
 137             done = true;
 138             obj.notifyAll();
 139         }
 140 
 141         for (int i = 0; i < NUM_THREADS; i++) {
 142             try {
 143                 threads[i].join();
 144             } catch (InterruptedException e) {
 145                 System.out.println("Unexpected exception is thrown.");
 146                 e.printStackTrace(System.out);
 147                 testFailed = true;
 148                 break;
 149             }
 150         }
 151         if (testFailed) {
 152             throw new RuntimeException("TEST FAILED");
 153         }
 154 
 155         System.out.println("Test passed");
 156     }
 157 
 158 
 159     private static void goSleep(long ms) throws Exception {
 160         try {
 161             Thread.sleep(ms);
 162         } catch (InterruptedException e) {
 163             System.out.println("Unexpected exception is thrown.");
 164             throw e;
 165         }
 166     }
 167 
 168     private static void waitUntilThreadBlocked()
 169         throws Exception {
 170         int count = 0;
 171         while (count != NUM_THREADS) {
 172             goSleep(100);
 173             count = 0;
 174             for (int i = 0; i < NUM_THREADS; i++) {
 175                 ThreadInfo info = mbean.getThreadInfo(threads[i].getId());
 176                 if (info.getThreadState() == Thread.State.WAITING) {
 177                     count++;
 178                 }
 179             }
 180         }
 181     }
 182 
 183     static class MyThread extends Thread {
 184         public MyThread(String name) {
 185             super(name);
 186         }
 187 
 188         public void run() {
 189             double sum = 0;
 190             for (int i = 0; i < 5000; i++) {
 191                double r = Math.random();
 192                double x = Math.pow(3, r);
 193                sum += x - r;
 194             }
 195             synchronized (obj) {
 196                 while (!done) {
 197                     try {
 198                         obj.wait();
 199                     } catch (InterruptedException e) {
 200                         System.out.println("Unexpected exception is thrown.");
 201                         e.printStackTrace(System.out);
 202                         testFailed = true;
 203                         break;
 204                     }
 205                 }
 206             }
 207 
 208             sum = 0;
 209             for (int i = 0; i < 5000; i++) {
 210                double r = Math.random();
 211                double x = Math.pow(3, r);
 212                sum += x - r;
 213             }
 214 
 215             long utime1 = mbean.getCurrentThreadUserTime();
 216             long utime2 = mbean.getThreadUserTime(getId());
 217             long time1 = mbean.getCurrentThreadCpuTime();
 218             long time2 = mbean.getThreadCpuTime(getId());
 219 
 220             System.out.println(getName() + ": " +
 221                 "CurrentThreadUserTime = " + utime1 +
 222                 " ThreadUserTime = " + utime2);
 223             System.out.println(getName() + ": " +
 224                 "CurrentThreadCpuTime  = " + time1 +
 225                 " ThreadCpuTime  = " + time2);
 226 
 227             if (time1 > time2) {
 228                 throw new RuntimeException("TEST FAILED: " + getName() +
 229                     " CurrentThreadCpuTime = " + time1 +
 230                     " > ThreadCpuTime = " + time2);
 231             }
 232 /*************
 233  * FIXME: Seems that on Solaris-sparc,
 234  * It occasionally returns a different current thread user time > thread user time
 235             if (utime1 > utime2) {
 236                 throw new RuntimeException("TEST FAILED: " + getName() +
 237                     " CurrentThreadUserTime = " + utime1 +
 238                     " > ThreadUserTime = " + utime2);
 239             }
 240 */
 241         }
 242     }
 243 
 244 }