ThreadCpuTime.java revision 16930:13c06d444258
1185573Srwatson/* 2191273Srwatson * Copyright (c) 2003, 2015, Oracle and/or its affiliates. All rights reserved. 3155131Srwatson * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4155131Srwatson * 5155131Srwatson * This code is free software; you can redistribute it and/or modify it 6155131Srwatson * under the terms of the GNU General Public License version 2 only, as 7155131Srwatson * published by the Free Software Foundation. 8155131Srwatson * 9155131Srwatson * This code is distributed in the hope that it will be useful, but WITHOUT 10155131Srwatson * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11155131Srwatson * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12155131Srwatson * version 2 for more details (a copy is included in the LICENSE file that 13185573Srwatson * accompanied this code). 14155131Srwatson * 15155131Srwatson * You should have received a copy of the GNU General Public License version 16155131Srwatson * 2 along with this work; if not, write to the Free Software Foundation, 17155131Srwatson * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18155131Srwatson * 19155131Srwatson * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20155131Srwatson * or visit www.oracle.com if you need additional information or have any 21155131Srwatson * questions. 22155131Srwatson */ 23155131Srwatson 24155131Srwatson/* 25155131Srwatson * @test 26155131Srwatson * @bug 4530538 27155131Srwatson * @summary Basic test of ThreadMXBean.getThreadCpuTime and 28155131Srwatson * getCurrentThreadCpuTime. 29191273Srwatson * @author Mandy Chung 30155131Srwatson */ 31155131Srwatson 32155131Srwatsonimport java.lang.management.*; 33155131Srwatson 34155131Srwatsonpublic class ThreadCpuTime { 35156283Srwatson private static ThreadMXBean mbean = ManagementFactory.getThreadMXBean(); 36156283Srwatson private static boolean testFailed = false; 37156283Srwatson private static boolean done = false; 38156283Srwatson private static Object obj = new Object(); 39156283Srwatson private static final int NUM_THREADS = 10; 40156283Srwatson private static Thread[] threads = new Thread[NUM_THREADS]; 41156283Srwatson private static long[] times = new long[NUM_THREADS]; 42156283Srwatson 43156283Srwatson // careful about this value 44156283Srwatson private static final int DELTA = 100; 45155131Srwatson 46155131Srwatson public static void main(String[] argv) 47156283Srwatson throws Exception { 48159985Srwatson if (!mbean.isCurrentThreadCpuTimeSupported()) { 49156283Srwatson return; 50156283Srwatson } 51156283Srwatson 52156283Srwatson // disable CPU time 53156283Srwatson if (mbean.isThreadCpuTimeEnabled()) { 54155518Srwatson mbean.setThreadCpuTimeEnabled(false); 55155518Srwatson } 56155131Srwatson 57155131Srwatson Thread curThread = Thread.currentThread(); 58155131Srwatson long t = mbean.getCurrentThreadCpuTime(); 59155131Srwatson if (t != -1) { 60155131Srwatson throw new RuntimeException("Invalid CurrenThreadCpuTime returned = " + 61155131Srwatson t + " expected = -1"); 62155131Srwatson } 63191273Srwatson 64155131Srwatson if (mbean.isThreadCpuTimeSupported()) { 65155131Srwatson long t1 = mbean.getThreadCpuTime(curThread.getId()); 66155131Srwatson if (t1 != -1) { 67155131Srwatson throw new RuntimeException("Invalid ThreadCpuTime returned = " + 68155131Srwatson t1 + " expected = -1"); 69168777Srwatson } 70168777Srwatson } 71155131Srwatson 72155131Srwatson // Enable CPU Time measurement 73155131Srwatson if (!mbean.isThreadCpuTimeEnabled()) { 74155131Srwatson mbean.setThreadCpuTimeEnabled(true); 75155131Srwatson } 76155131Srwatson 77155131Srwatson if (!mbean.isThreadCpuTimeEnabled()) { 78155131Srwatson throw new RuntimeException("ThreadCpuTime is expected to be enabled"); 79155131Srwatson } 80191273Srwatson 81155131Srwatson long time = mbean.getCurrentThreadCpuTime(); 82155131Srwatson if (time < 0) { 83155131Srwatson throw new RuntimeException("Invalid CPU time returned = " + time); 84155131Srwatson } 85155131Srwatson 86155131Srwatson if (!mbean.isThreadCpuTimeSupported()) { 87155131Srwatson return; 88155131Srwatson } 89155131Srwatson 90155131Srwatson 91155131Srwatson // Expected to be time1 >= time 92155131Srwatson long time1 = mbean.getThreadCpuTime(curThread.getId()); 93155131Srwatson if (time1 < time) { 94155131Srwatson throw new RuntimeException("CPU time " + time1 + 95155131Srwatson " expected >= " + time); 96155131Srwatson } 97155131Srwatson System.out.println(curThread.getName() + 98155131Srwatson " Current Thread Cpu Time = " + time + 99155131Srwatson " CPU time = " + time1); 100155131Srwatson 101155131Srwatson for (int i = 0; i < NUM_THREADS; i++) { 102155131Srwatson threads[i] = new MyThread("MyThread-" + i); 103155131Srwatson threads[i].start(); 104155131Srwatson } 105155131Srwatson 106155131Srwatson waitUntilThreadBlocked(); 107155131Srwatson 108155131Srwatson for (int i = 0; i < NUM_THREADS; i++) { 109155131Srwatson times[i] = mbean.getThreadCpuTime(threads[i].getId()); 110155131Srwatson } 111155131Srwatson 112168777Srwatson goSleep(200); 113155131Srwatson 114155131Srwatson for (int i = 0; i < NUM_THREADS; i++) { 115155131Srwatson long newTime = mbean.getThreadCpuTime(threads[i].getId()); 116155131Srwatson if (times[i] > newTime) { 117155131Srwatson throw new RuntimeException("TEST FAILED: " + 118155131Srwatson threads[i].getName() + 119155131Srwatson " previous CPU time = " + times[i] + 120155131Srwatson " > current CPU time = " + newTime); 121155131Srwatson } 122155131Srwatson if ((times[i] + DELTA) < newTime) { 123155131Srwatson throw new RuntimeException("TEST FAILED: " + 124155131Srwatson threads[i].getName() + 125155131Srwatson " CPU time = " + newTime + 126155131Srwatson " previous CPU time " + times[i] + 127155131Srwatson " out of expected range"); 128155131Srwatson } 129155131Srwatson 130155131Srwatson System.out.println(threads[i].getName() + 131155131Srwatson " Previous Cpu Time = " + times[i] + 132155131Srwatson " Current CPU time = " + newTime); 133155131Srwatson } 134155131Srwatson 135155131Srwatson synchronized (obj) { 136155131Srwatson done = true; 137155131Srwatson obj.notifyAll(); 138155131Srwatson } 139155131Srwatson 140191273Srwatson for (int i = 0; i < NUM_THREADS; i++) { 141155131Srwatson try { 142155131Srwatson threads[i].join(); 143155131Srwatson } catch (InterruptedException e) { 144155131Srwatson System.out.println("Unexpected exception is thrown."); 145155131Srwatson e.printStackTrace(System.out); 146155131Srwatson testFailed = true; 147155131Srwatson break; 148155131Srwatson } 149155131Srwatson } 150155131Srwatson if (testFailed) { 151155131Srwatson throw new RuntimeException("TEST FAILED"); 152155131Srwatson } 153155131Srwatson 154155131Srwatson System.out.println("Test passed"); 155155131Srwatson } 156155131Srwatson 157155131Srwatson 158155131Srwatson private static void goSleep(long ms) throws Exception { 159155131Srwatson try { 160155518Srwatson Thread.sleep(ms); 161155131Srwatson } catch (InterruptedException e) { 162155518Srwatson System.out.println("Unexpected exception is thrown."); 163155518Srwatson throw e; 164155518Srwatson } 165155518Srwatson } 166155518Srwatson 167155518Srwatson private static void waitUntilThreadBlocked() 168191273Srwatson throws Exception { 169155518Srwatson int count = 0; 170191273Srwatson while (count != NUM_THREADS) { 171155518Srwatson goSleep(100); 172155518Srwatson count = 0; 173155518Srwatson for (int i = 0; i < NUM_THREADS; i++) { 174155518Srwatson ThreadInfo info = mbean.getThreadInfo(threads[i].getId()); 175155518Srwatson if (info.getThreadState() == Thread.State.WAITING) { 176155518Srwatson count++; 177191273Srwatson } 178155518Srwatson } 179155518Srwatson } 180155518Srwatson } 181155518Srwatson 182 static class MyThread extends Thread { 183 public MyThread(String name) { 184 super(name); 185 } 186 187 public void run() { 188 double sum = 0; 189 for (int i = 0; i < 5000; i++) { 190 double r = Math.random(); 191 double x = Math.pow(3, r); 192 sum += x - r; 193 } 194 synchronized (obj) { 195 while (!done) { 196 try { 197 obj.wait(); 198 } catch (InterruptedException e) { 199 System.out.println("Unexpected exception is thrown."); 200 e.printStackTrace(System.out); 201 testFailed = true; 202 break; 203 } 204 } 205 } 206 207 sum = 0; 208 for (int i = 0; i < 5000; i++) { 209 double r = Math.random(); 210 double x = Math.pow(3, r); 211 sum += x - r; 212 } 213 214 long utime1 = mbean.getCurrentThreadUserTime(); 215 long utime2 = mbean.getThreadUserTime(getId()); 216 long time1 = mbean.getCurrentThreadCpuTime(); 217 long time2 = mbean.getThreadCpuTime(getId()); 218 219 System.out.println(getName() + ": " + 220 "CurrentThreadUserTime = " + utime1 + 221 " ThreadUserTime = " + utime2); 222 System.out.println(getName() + ": " + 223 "CurrentThreadCpuTime = " + time1 + 224 " ThreadCpuTime = " + time2); 225 226 if (time1 > time2) { 227 throw new RuntimeException("TEST FAILED: " + getName() + 228 " CurrentThreadCpuTime = " + time1 + 229 " > ThreadCpuTime = " + time2); 230 } 231/************* 232 * FIXME: Seems that on Solaris-sparc, 233 * It occasionally returns a different current thread user time > thread user time 234 if (utime1 > utime2) { 235 throw new RuntimeException("TEST FAILED: " + getName() + 236 " CurrentThreadUserTime = " + utime1 + 237 " > ThreadUserTime = " + utime2); 238 } 239*/ 240 } 241 } 242 243} 244