| /* |
| * Copyright (c) 2003, 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test |
| * @bug 4530538 |
| * @summary Basic test of ThreadMXBean.getThreadCpuTime and |
| * getCurrentThreadCpuTime. |
| * @author Mandy Chung |
| * @modules java.management |
| */ |
| |
| import java.lang.management.*; |
| |
| public class ThreadCpuTime { |
| private static ThreadMXBean mbean = ManagementFactory.getThreadMXBean(); |
| private static boolean testFailed = false; |
| private static boolean done = false; |
| private static Object obj = new Object(); |
| private static final int NUM_THREADS = 10; |
| private static Thread[] threads = new Thread[NUM_THREADS]; |
| private static long[] times = new long[NUM_THREADS]; |
| |
| // careful about this value |
| private static final int DELTA = 100; |
| |
| public static void main(String[] argv) |
| throws Exception { |
| if (!mbean.isCurrentThreadCpuTimeSupported()) { |
| return; |
| } |
| |
| // disable CPU time |
| if (mbean.isThreadCpuTimeEnabled()) { |
| mbean.setThreadCpuTimeEnabled(false); |
| } |
| |
| Thread curThread = Thread.currentThread(); |
| long t = mbean.getCurrentThreadCpuTime(); |
| if (t != -1) { |
| throw new RuntimeException("Invalid CurrenThreadCpuTime returned = " + |
| t + " expected = -1"); |
| } |
| |
| if (mbean.isThreadCpuTimeSupported()) { |
| long t1 = mbean.getThreadCpuTime(curThread.getId()); |
| if (t1 != -1) { |
| throw new RuntimeException("Invalid ThreadCpuTime returned = " + |
| t1 + " expected = -1"); |
| } |
| } |
| |
| // Enable CPU Time measurement |
| if (!mbean.isThreadCpuTimeEnabled()) { |
| mbean.setThreadCpuTimeEnabled(true); |
| } |
| |
| if (!mbean.isThreadCpuTimeEnabled()) { |
| throw new RuntimeException("ThreadCpuTime is expected to be enabled"); |
| } |
| |
| long time = mbean.getCurrentThreadCpuTime(); |
| if (time < 0) { |
| throw new RuntimeException("Invalid CPU time returned = " + time); |
| } |
| |
| if (!mbean.isThreadCpuTimeSupported()) { |
| return; |
| } |
| |
| |
| // Expected to be time1 >= time |
| long time1 = mbean.getThreadCpuTime(curThread.getId()); |
| if (time1 < time) { |
| throw new RuntimeException("CPU time " + time1 + |
| " expected >= " + time); |
| } |
| System.out.println(curThread.getName() + |
| " Current Thread Cpu Time = " + time + |
| " CPU time = " + time1); |
| |
| for (int i = 0; i < NUM_THREADS; i++) { |
| threads[i] = new MyThread("MyThread-" + i); |
| threads[i].start(); |
| } |
| |
| waitUntilThreadBlocked(); |
| |
| for (int i = 0; i < NUM_THREADS; i++) { |
| times[i] = mbean.getThreadCpuTime(threads[i].getId()); |
| } |
| |
| goSleep(200); |
| |
| for (int i = 0; i < NUM_THREADS; i++) { |
| long newTime = mbean.getThreadCpuTime(threads[i].getId()); |
| if (times[i] > newTime) { |
| throw new RuntimeException("TEST FAILED: " + |
| threads[i].getName() + |
| " previous CPU time = " + times[i] + |
| " > current CPU time = " + newTime); |
| } |
| if ((times[i] + DELTA) < newTime) { |
| throw new RuntimeException("TEST FAILED: " + |
| threads[i].getName() + |
| " CPU time = " + newTime + |
| " previous CPU time " + times[i] + |
| " out of expected range"); |
| } |
| |
| System.out.println(threads[i].getName() + |
| " Previous Cpu Time = " + times[i] + |
| " Current CPU time = " + newTime); |
| } |
| |
| synchronized (obj) { |
| done = true; |
| obj.notifyAll(); |
| } |
| |
| for (int i = 0; i < NUM_THREADS; i++) { |
| try { |
| threads[i].join(); |
| } catch (InterruptedException e) { |
| System.out.println("Unexpected exception is thrown."); |
| e.printStackTrace(System.out); |
| testFailed = true; |
| break; |
| } |
| } |
| if (testFailed) { |
| throw new RuntimeException("TEST FAILED"); |
| } |
| |
| System.out.println("Test passed"); |
| } |
| |
| |
| private static void goSleep(long ms) throws Exception { |
| try { |
| Thread.sleep(ms); |
| } catch (InterruptedException e) { |
| System.out.println("Unexpected exception is thrown."); |
| throw e; |
| } |
| } |
| |
| private static void waitUntilThreadBlocked() |
| throws Exception { |
| int count = 0; |
| while (count != NUM_THREADS) { |
| goSleep(100); |
| count = 0; |
| for (int i = 0; i < NUM_THREADS; i++) { |
| ThreadInfo info = mbean.getThreadInfo(threads[i].getId()); |
| if (info.getThreadState() == Thread.State.WAITING) { |
| count++; |
| } |
| } |
| } |
| } |
| |
| static class MyThread extends Thread { |
| public MyThread(String name) { |
| super(name); |
| } |
| |
| public void run() { |
| double sum = 0; |
| for (int i = 0; i < 5000; i++) { |
| double r = Math.random(); |
| double x = Math.pow(3, r); |
| sum += x - r; |
| } |
| synchronized (obj) { |
| while (!done) { |
| try { |
| obj.wait(); |
| } catch (InterruptedException e) { |
| System.out.println("Unexpected exception is thrown."); |
| e.printStackTrace(System.out); |
| testFailed = true; |
| break; |
| } |
| } |
| } |
| |
| sum = 0; |
| for (int i = 0; i < 5000; i++) { |
| double r = Math.random(); |
| double x = Math.pow(3, r); |
| sum += x - r; |
| } |
| |
| long utime1 = mbean.getCurrentThreadUserTime(); |
| long utime2 = mbean.getThreadUserTime(getId()); |
| long time1 = mbean.getCurrentThreadCpuTime(); |
| long time2 = mbean.getThreadCpuTime(getId()); |
| |
| System.out.println(getName() + ": " + |
| "CurrentThreadUserTime = " + utime1 + |
| " ThreadUserTime = " + utime2); |
| System.out.println(getName() + ": " + |
| "CurrentThreadCpuTime = " + time1 + |
| " ThreadCpuTime = " + time2); |
| |
| if (time1 > time2) { |
| throw new RuntimeException("TEST FAILED: " + getName() + |
| " CurrentThreadCpuTime = " + time1 + |
| " > ThreadCpuTime = " + time2); |
| } |
| /************* |
| * FIXME: Seems that on Solaris-sparc, |
| * It occasionally returns a different current thread user time > thread user time |
| if (utime1 > utime2) { |
| throw new RuntimeException("TEST FAILED: " + getName() + |
| " CurrentThreadUserTime = " + utime1 + |
| " > ThreadUserTime = " + utime2); |
| } |
| */ |
| } |
| } |
| |
| } |