231 lines
8.4 KiB
Java
231 lines
8.4 KiB
Java
/*
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* Copyright (c) 2004, 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 low memory detection of non-heap memory pool.
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*
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* The test set a listener to be notified when any of the non-heap pools
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* exceed 80%. It then starts a thread that continuously loads classes.
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* In the HotSpot implementation this causes perm space to be consumed.
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* Test completes when we the notification is received or an OutOfMemory
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* is generated.
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*/
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import java.lang.management.*;
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import javax.management.*;
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import javax.management.openmbean.CompositeData;
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import java.util.*;
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public class LowMemoryTest2 {
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private static volatile boolean listenerInvoked = false;
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private static String INDENT = " ";
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static class SensorListener implements NotificationListener {
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public void handleNotification(Notification notif, Object handback) {
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String type = notif.getType();
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if (type.equals(MemoryNotificationInfo.MEMORY_THRESHOLD_EXCEEDED) ||
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type.equals(MemoryNotificationInfo.
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MEMORY_COLLECTION_THRESHOLD_EXCEEDED)) {
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listenerInvoked = true;
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MemoryNotificationInfo minfo = MemoryNotificationInfo.
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from((CompositeData) notif.getUserData());
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System.out.print("Notification for " + minfo.getPoolName());
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System.out.print(" [type = " + type);
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System.out.println(" count = " + minfo.getCount() + "]");
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System.out.println(INDENT + "usage = " + minfo.getUsage());
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}
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}
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}
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// Loads classes Test100001, Test100002, .... until OutOfMemoryErrror or
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// low memory notification
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static class BoundlessLoaderThread extends ClassLoader implements Runnable {
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static int count = 100000;
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Class loadNext() throws ClassNotFoundException {
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// public class TestNNNNNN extends java.lang.Object{
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// public TestNNNNNN();
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// Code:
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// 0: aload_0
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// 1: invokespecial #1; //Method java/lang/Object."<init>":()V
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// 4: return
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// }
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int begin[] = {
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0xca, 0xfe, 0xba, 0xbe, 0x00, 0x00, 0x00, 0x30,
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0x00, 0x0a, 0x0a, 0x00, 0x03, 0x00, 0x07, 0x07,
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0x00, 0x08, 0x07, 0x00, 0x09, 0x01, 0x00, 0x06,
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0x3c, 0x69, 0x6e, 0x69, 0x74, 0x3e, 0x01, 0x00,
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0x03, 0x28, 0x29, 0x56, 0x01, 0x00, 0x04, 0x43,
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0x6f, 0x64, 0x65, 0x0c, 0x00, 0x04, 0x00, 0x05,
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0x01, 0x00, 0x0a, 0x54, 0x65, 0x73, 0x74 };
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int end [] = {
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0x01, 0x00, 0x10,
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0x6a, 0x61, 0x76, 0x61, 0x2f, 0x6c, 0x61, 0x6e,
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0x67, 0x2f, 0x4f, 0x62, 0x6a, 0x65, 0x63, 0x74,
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0x00, 0x21, 0x00, 0x02, 0x00, 0x03, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x01, 0x00, 0x01, 0x00, 0x04,
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0x00, 0x05, 0x00, 0x01, 0x00, 0x06, 0x00, 0x00,
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0x00, 0x11, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00,
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0x00, 0x05, 0x2a, 0xb7, 0x00, 0x01, 0xb1, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00 };
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// TestNNNNNN
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String name = "Test" + Integer.toString(count++);
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byte value[];
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try {
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value = name.substring(4).getBytes("UTF-8");
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} catch (java.io.UnsupportedEncodingException x) {
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throw new Error();
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}
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// construct class file
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int len = begin.length + value.length + end.length;
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byte b[] = new byte[len];
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int i, pos=0;
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for (i=0; i<begin.length; i++) {
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b[pos++] = (byte)begin[i];
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}
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for (i=0; i<value.length; i++) {
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b[pos++] = value[i];
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}
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for (i=0; i<end.length; i++) {
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b[pos++] = (byte)end[i];
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}
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return defineClass(name, b, 0, b.length);
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}
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/*
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* Run method for thread that continuously loads classes.
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*
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* Note: Once the usage threshold has been exceeded the low memory
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* detector thread will attempt to deliver its notification - this can
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* potentially create a race condition with this thread contining to
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* fill up perm space. To avoid the low memory detector getting an OutOfMemory
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* we throttle this thread once the threshold has been exceeded.
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*/
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public void run() {
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List pools = ManagementFactory.getMemoryPoolMXBeans();
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boolean thresholdExceeded = false;
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for (;;) {
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try {
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// the classes are small so we load 10 at a time
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for (int i=0; i<10; i++) {
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loadNext();
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}
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} catch (ClassNotFoundException x) {
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return;
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}
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if (listenerInvoked) {
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return;
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}
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// if threshold has been exceeded we put in a delay to allow
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// the low memory detector do its job.
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if (thresholdExceeded) {
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try {
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Thread.currentThread().sleep(100);
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} catch (InterruptedException x) { }
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} else {
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// check if the threshold has been exceeded
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ListIterator i = pools.listIterator();
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while (i.hasNext()) {
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MemoryPoolMXBean p = (MemoryPoolMXBean) i.next();
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if (p.getType() == MemoryType.NON_HEAP &&
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p.isUsageThresholdSupported())
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{
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thresholdExceeded = p.isUsageThresholdExceeded();
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}
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}
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}
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}
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}
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}
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public static void main(String args[]) {
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ListIterator iter = ManagementFactory.getMemoryPoolMXBeans().listIterator();
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// Set threshold of 80% of all NON_HEAP memory pools
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// In the Hotspot implementation this means we should get a notification
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// if the CodeCache or perm generation fills up.
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while (iter.hasNext()) {
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MemoryPoolMXBean p = (MemoryPoolMXBean) iter.next();
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if (p.getType() == MemoryType.NON_HEAP && p.isUsageThresholdSupported()) {
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// set threshold
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MemoryUsage mu = p.getUsage();
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long threshold = (mu.getMax() * 80) / 100;
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p.setUsageThreshold(threshold);
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System.out.println("Selected memory pool for low memory " +
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"detection.");
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MemoryUtil.printMemoryPool(p);
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}
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}
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// Install the listener
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MemoryMXBean mm = ManagementFactory.getMemoryMXBean();
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SensorListener l2 = new SensorListener();
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NotificationEmitter emitter = (NotificationEmitter) mm;
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emitter.addNotificationListener(l2, null, null);
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// Start the thread loading classes
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Thread thr = new Thread(new BoundlessLoaderThread());
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thr.start();
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// Wait for the thread to terminate
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try {
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thr.join();
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} catch (InterruptedException x) {
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throw new RuntimeException(x);
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}
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if (listenerInvoked) {
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System.out.println("Notification received - test passed.");
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} else {
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throw new RuntimeException("Test failed - notification not received!");
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}
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}
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}
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