264 lines
8.3 KiB
Java
264 lines
8.3 KiB
Java
/*
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* Copyright (c) 2011, 2024, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 6173675
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* @key randomness
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* @summary Basic test of ThreadMXBean.getThreadCpuTime(long[]) and
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* getThreadUserTime(long[]).
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* @author Paul Hohensee
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* @requires vm.compMode != "Xcomp"
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* @run main/othervm ThreadCpuTimeArray
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*/
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import java.lang.management.*;
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public class ThreadCpuTimeArray {
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private static com.sun.management.ThreadMXBean mbean =
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(com.sun.management.ThreadMXBean)ManagementFactory.getThreadMXBean();
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private static boolean testFailed = false;
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private static boolean done = false;
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private static Object obj = new Object();
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private static final int NUM_THREADS = 10;
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private static Thread[] threads = new Thread[NUM_THREADS];
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// careful about this value
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private static final int DELTA = 100;
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public static void main(String[] argv)
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throws Exception {
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if (!mbean.isThreadCpuTimeSupported()) {
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return;
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}
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// disable CPU time
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if (mbean.isThreadCpuTimeEnabled()) {
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mbean.setThreadCpuTimeEnabled(false);
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}
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if (mbean.isThreadCpuTimeEnabled()) {
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throw new RuntimeException("ThreadCpuTime is expected to be disabled");
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}
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// start threads, wait for them to block
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long[] ids = new long[NUM_THREADS];
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for (int i = 0; i < NUM_THREADS; i++) {
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threads[i] = new MyThread("MyThread-" + i);
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threads[i].start();
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ids[i] = threads[i].getId();
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}
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// threads block after doing some computation
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waitUntilThreadBlocked();
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long times[] = mbean.getThreadCpuTime(ids);
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long userTimes[] = mbean.getThreadUserTime(ids);
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if (times == null) {
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throw new RuntimeException("Null ThreadCpuTime array returned");
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}
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for (int i = 0; i < NUM_THREADS; i++) {
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long t = times[i];
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if (t != -1) {
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throw new RuntimeException(
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"Invalid ThreadCpuTime returned for thread " +
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threads[i].getName() + " = " + t + " expected = -1");
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}
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long ut = userTimes[i];
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if (ut != -1) {
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throw new RuntimeException(
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"Invalid ThreadUserTime returned for thread " +
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threads[i].getName() + " = " + ut + " expected = -1");
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}
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}
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// Enable CPU Time measurement
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if (!mbean.isThreadCpuTimeEnabled()) {
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mbean.setThreadCpuTimeEnabled(true);
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}
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if (!mbean.isThreadCpuTimeEnabled()) {
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throw new RuntimeException("ThreadCpuTime is expected to be enabled");
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}
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times = mbean.getThreadCpuTime(ids);
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userTimes = mbean.getThreadUserTime(ids);
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goSleep(200);
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for (int i = 0; i < NUM_THREADS; i++) {
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long t = times[i];
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if (t < 0) {
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throw new RuntimeException(
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"Invalid CPU time returned for thread " +
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threads[i].getName() + " = " + t);
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}
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long ut = userTimes[i];
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if (ut < 0) {
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throw new RuntimeException(
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"Invalid user time returned for thread " +
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threads[i].getName() + " = " + ut);
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}
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}
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long[] times1 = mbean.getThreadCpuTime(ids);
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long[] userTimes1 = mbean.getThreadUserTime(ids);
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for (int i = 0; i < NUM_THREADS; i++) {
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long newTime = times1[i];
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long newUserTime = userTimes1[i];
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if (times[i] > newTime) {
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throw new RuntimeException("TEST FAILED: " +
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threads[i].getName() +
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" previous CPU time = " + times[i] +
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" > current CPU time = " + newTime);
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}
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if ((times[i] + DELTA) < newTime) {
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throw new RuntimeException("TEST FAILED: " +
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threads[i].getName() +
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" CPU time = " + newTime +
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" previous CPU time " + times[i] +
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" out of expected range");
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}
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System.out.println(threads[i].getName() +
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" Previous Cpu Time = " + times[i] +
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" Current CPU time = " + newTime);
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System.out.println(threads[i].getName() +
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" Previous User Time = " + userTimes[i] +
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" Current User time = " + newUserTime);
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}
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try {
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times = mbean.getThreadCpuTime(null);
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} catch (NullPointerException e) {
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System.out.println(
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"Caught expected NullPointerException: " + e.getMessage());
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}
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try {
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ids[0] = 0;
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times = mbean.getThreadCpuTime(ids);
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} catch (IllegalArgumentException e) {
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System.out.println(
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"Caught expected IllegalArgumentException: " + e.getMessage());
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}
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// let threads exit
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synchronized (obj) {
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done = true;
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obj.notifyAll();
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}
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for (int i = 0; i < NUM_THREADS; i++) {
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try {
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threads[i].join();
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} catch (InterruptedException e) {
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System.out.println("Unexpected exception is thrown.");
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e.printStackTrace(System.out);
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testFailed = true;
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break;
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}
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}
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if (testFailed) {
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throw new RuntimeException("TEST FAILED");
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}
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System.out.println("Test passed");
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}
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private static void goSleep(long ms) throws Exception {
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try {
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Thread.sleep(ms);
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} catch (InterruptedException e) {
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System.out.println("Unexpected exception is thrown.");
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throw e;
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}
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}
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private static void waitUntilThreadBlocked()
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throws Exception {
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int count = 0;
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while (count != NUM_THREADS) {
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goSleep(100);
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count = 0;
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for (int i = 0; i < NUM_THREADS; i++) {
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ThreadInfo info = mbean.getThreadInfo(threads[i].getId());
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if (info.getThreadState() == Thread.State.WAITING) {
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count++;
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}
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}
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}
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// Account for threads using CPU for a few millis after their WAITING state is visible:
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goSleep(500);
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}
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public static void doit() {
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double sum = 0;
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for (int i = 0; i < 5000; i++) {
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double r = Math.random();
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double x = Math.pow(3, r);
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sum += x - r;
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}
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System.out.println(Thread.currentThread().getName() +
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" sum = " + sum);
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}
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static class MyThread extends Thread {
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public MyThread(String name) {
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super(name);
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}
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public void run() {
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ThreadCpuTimeArray.doit();
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synchronized (obj) {
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while (!done) {
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try {
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obj.wait();
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} catch (InterruptedException e) {
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System.out.println("Unexpected exception is thrown.");
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e.printStackTrace(System.out);
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testFailed = true;
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break;
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}
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}
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}
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ThreadCpuTimeArray.doit();
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}
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}
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}
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