408 lines
16 KiB
Java
408 lines
16 KiB
Java
/*
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* Copyright (c) 2003, 2017, 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 4530538
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* @summary Basic unit test of memory management testing:
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* 1) setUsageThreshold() and getUsageThreshold()
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* 2) test low memory detection on the old generation.
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* @author Mandy Chung
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*
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* @requires vm.gc == "null"
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* @requires vm.opt.ExplicitGCInvokesConcurrent != "true"
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* @requires vm.opt.DisableExplicitGC != "true"
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* @library /lib/testlibrary/
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*
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* @build jdk.testlibrary.* LowMemoryTest MemoryUtil RunUtil
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* @run main/timeout=600 LowMemoryTest
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*/
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import java.lang.management.*;
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import java.util.*;
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import java.util.concurrent.Phaser;
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import javax.management.*;
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import javax.management.openmbean.CompositeData;
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import jdk.testlibrary.ProcessTools;
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import jdk.testlibrary.JDKToolFinder;
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import jdk.testlibrary.Utils;
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public class LowMemoryTest {
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private static final MemoryMXBean mm = ManagementFactory.getMemoryMXBean();
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private static final List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans();
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private static final Phaser phaser = new Phaser(2);
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private static MemoryPoolMXBean mpool = null;
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private static boolean trace = false;
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private static boolean testFailed = false;
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private static final int NUM_TRIGGERS = 5;
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private static final int NUM_CHUNKS = 2;
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private static final int YOUNG_GEN_SIZE = 8 * 1024 * 1024;
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private static long chunkSize;
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private static final String classMain = "LowMemoryTest$TestMain";
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/**
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* Run the test multiple times with different GC versions.
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* First with default command line specified by the framework.
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* Then with GC versions specified by the test.
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*/
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public static void main(String a[]) throws Throwable {
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// Use a low young gen size to ensure that the
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// allocated objects are put in the old gen.
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final String nmFlag = "-Xmn" + YOUNG_GEN_SIZE;
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// Using large pages will change the young gen size,
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// make sure we don't use them for this test.
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final String lpFlag = "-XX:-UseLargePages";
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// Prevent G1 from selecting a large heap region size,
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// since that would change the young gen size.
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final String g1Flag = "-XX:G1HeapRegionSize=1m";
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// Runs the test collecting subprocess I/O while it's running.
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traceTest(classMain + ", -XX:+UseSerialGC", nmFlag, lpFlag, "-XX:+UseSerialGC");
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traceTest(classMain + ", -XX:+UseParallelGC", nmFlag, lpFlag, "-XX:+UseParallelGC");
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traceTest(classMain + ", -XX:+UseG1GC", nmFlag, lpFlag, "-XX:+UseG1GC", g1Flag);
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traceTest(classMain + ", -XX:+UseConcMarkSweepGC", nmFlag, lpFlag, "-XX:+UseConcMarkSweepGC");
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}
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/*
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* Creating command-line for running subprocess JVM:
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*
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* JVM command line is like:
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* {test_jdk}/bin/java {defaultopts} -cp {test.class.path} {testopts} main
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*
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* {defaultopts} are the default java options set by the framework.
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*
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* @param testOpts java options specified by the test.
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*/
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private static List<String> buildCommandLine(String... testOpts) {
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List<String> opts = new ArrayList<>();
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opts.add(JDKToolFinder.getJDKTool("java"));
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opts.addAll(Arrays.asList(Utils.getTestJavaOpts()));
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opts.add("-cp");
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opts.add(System.getProperty("test.class.path", "test.class.path"));
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opts.add("-Xlog:gc*=debug");
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opts.addAll(Arrays.asList(testOpts));
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opts.add(classMain);
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return opts;
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}
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/**
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* Runs LowMemoryTest$TestMain with the passed options and redirects subprocess
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* standard I/O to the current (parent) process. This provides a trace of what
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* happens in the subprocess while it is runnning (and before it terminates).
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*
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* @param prefixName the prefix string for redirected outputs
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* @param testOpts java options specified by the test.
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*/
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private static void traceTest(String prefixName,
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String... testOpts)
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throws Throwable {
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// Building command-line
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List<String> opts = buildCommandLine(testOpts);
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// We activate all tracing in subprocess
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opts.add("trace");
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// Launch separate JVM subprocess
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String[] optsArray = opts.toArray(new String[0]);
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ProcessBuilder pb = new ProcessBuilder(optsArray);
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System.out.println("\n========= Tracing of subprocess " + prefixName + " =========");
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Process p = ProcessTools.startProcess(prefixName, pb);
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// Handling end of subprocess
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try {
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int exitCode = p.waitFor();
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if (exitCode != 0) {
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throw new RuntimeException(
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"Subprocess unexpected exit value of [" + exitCode + "]. Expected 0.\n");
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}
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} catch (InterruptedException e) {
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throw new RuntimeException("Parent process interrupted with exception : \n " + e + " :" );
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}
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}
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private static volatile boolean listenerInvoked = false;
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static class SensorListener implements NotificationListener {
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@Override
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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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MemoryNotificationInfo minfo = MemoryNotificationInfo.
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from((CompositeData) notif.getUserData());
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MemoryUtil.printMemoryNotificationInfo(minfo, type);
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listenerInvoked = true;
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}
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}
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}
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static class TestListener implements NotificationListener {
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private boolean isRelaxed = false;
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private int triggers = 0;
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private final long[] count = new long[NUM_TRIGGERS * 2];
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private final long[] usedMemory = new long[NUM_TRIGGERS * 2];
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public TestListener() {
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isRelaxed = ManagementFactory.getRuntimeMXBean().getInputArguments().contains("-XX:+UseConcMarkSweepGC");
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}
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@Override
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public void handleNotification(Notification notif, Object handback) {
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MemoryNotificationInfo minfo = MemoryNotificationInfo.
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from((CompositeData) notif.getUserData());
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count[triggers] = minfo.getCount();
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usedMemory[triggers] = minfo.getUsage().getUsed();
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triggers++;
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}
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public void checkResult() throws Exception {
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if (!checkValue(triggers, NUM_TRIGGERS)) {
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throw new RuntimeException("Unexpected number of triggers = " +
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triggers + " but expected to be " + NUM_TRIGGERS);
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}
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for (int i = 0; i < triggers; i++) {
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if (!checkValue(count[i], i + 1)) {
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throw new RuntimeException("Unexpected count of" +
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" notification #" + i +
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" count = " + count[i] +
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" but expected to be " + (i+1));
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}
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if (usedMemory[i] < newThreshold) {
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throw new RuntimeException("Used memory = " +
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usedMemory[i] + " is less than the threshold = " +
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newThreshold);
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}
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}
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}
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private boolean checkValue(int value, int target) {
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return checkValue((long)value, target);
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}
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private boolean checkValue(long value, int target) {
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if (!isRelaxed) {
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return value == target;
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} else {
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return value >= target;
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}
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}
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}
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private static long newThreshold;
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private static class TestMain {
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public static void main(String args[]) throws Exception {
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if (args.length > 0 && args[0].equals("trace")) {
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trace = true;
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}
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// Find the Old generation which supports low memory detection
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ListIterator iter = pools.listIterator();
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while (iter.hasNext()) {
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MemoryPoolMXBean p = (MemoryPoolMXBean) iter.next();
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if (p.getType() == MemoryType.HEAP &&
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p.isUsageThresholdSupported()) {
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mpool = p;
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if (trace) {
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System.out.println("Selected memory pool for low memory " +
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"detection.");
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MemoryUtil.printMemoryPool(mpool);
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}
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break;
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}
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}
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TestListener listener = new TestListener();
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SensorListener l2 = new SensorListener();
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NotificationEmitter emitter = (NotificationEmitter) mm;
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emitter.addNotificationListener(listener, null, null);
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emitter.addNotificationListener(l2, null, null);
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Thread allocator = new AllocatorThread();
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Thread sweeper = new SweeperThread();
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// The chunk size needs to be larger than YOUNG_GEN_SIZE,
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// otherwise we will get intermittent failures when objects
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// end up in the young gen instead of the old gen.
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final long epsilon = 1024;
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chunkSize = YOUNG_GEN_SIZE + epsilon;
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MemoryUsage mu = mpool.getUsage();
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newThreshold = mu.getUsed() + (chunkSize * NUM_CHUNKS);
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// Sanity check. Make sure the new threshold isn't too large.
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// Tweak the test if this fails.
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final long headRoom = chunkSize * 2;
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final long max = mu.getMax();
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if (max != -1 && newThreshold > max - headRoom) {
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throw new RuntimeException("TEST FAILED: newThreshold: " + newThreshold +
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" is too near the maximum old gen size: " + max +
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" used: " + mu.getUsed() + " headRoom: " + headRoom);
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}
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System.out.println("Setting threshold for " + mpool.getName() +
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" from " + mpool.getUsageThreshold() + " to " + newThreshold +
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". Current used = " + mu.getUsed());
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mpool.setUsageThreshold(newThreshold);
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if (mpool.getUsageThreshold() != newThreshold) {
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throw new RuntimeException("TEST FAILED: " +
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"Threshold for Memory pool " + mpool.getName() +
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"is " + mpool.getUsageThreshold() + " but expected to be" +
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newThreshold);
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}
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allocator.start();
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// Force Allocator start first
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phaser.arriveAndAwaitAdvance();
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sweeper.start();
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try {
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allocator.join();
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// Wait until AllocatorThread's done
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phaser.arriveAndAwaitAdvance();
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sweeper.join();
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} catch (InterruptedException e) {
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System.out.println("Unexpected exception:" + e);
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testFailed = true;
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}
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listener.checkResult();
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if (testFailed)
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throw new RuntimeException("TEST FAILED.");
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System.out.println(RunUtil.successMessage);
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}
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}
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private static void goSleep(long ms) {
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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:" + e);
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testFailed = true;
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}
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}
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private static final List<Object> objectPool = new ArrayList<>();
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static class AllocatorThread extends Thread {
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public void doTask() {
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int iterations = 0;
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int numElements = (int) (chunkSize / 4); // minimal object size
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while (!listenerInvoked || mpool.getUsage().getUsed() < mpool.getUsageThreshold()) {
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iterations++;
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if (trace) {
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System.out.println(" Iteration " + iterations +
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": before allocation " +
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mpool.getUsage().getUsed());
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}
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Object[] o = new Object[numElements];
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if (iterations <= NUM_CHUNKS) {
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// only hold a reference to the first NUM_CHUNKS
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// allocated objects
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objectPool.add(o);
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}
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if (trace) {
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System.out.println(" " +
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" after allocation " +
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mpool.getUsage().getUsed());
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}
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goSleep(100);
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}
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}
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@Override
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public void run() {
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for (int i = 1; i <= NUM_TRIGGERS; i++) {
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// Sync with SweeperThread's second phase.
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phaser.arriveAndAwaitAdvance();
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System.out.println("AllocatorThread is doing task " + i +
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" phase " + phaser.getPhase());
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doTask();
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// Sync with SweeperThread's first phase.
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phaser.arriveAndAwaitAdvance();
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System.out.println("AllocatorThread done task " + i +
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" phase " + phaser.getPhase());
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if (testFailed) {
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return;
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}
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}
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}
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}
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static class SweeperThread extends Thread {
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private void doTask() {
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int iterations = 0;
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if (trace) {
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System.out.println("SweeperThread clearing allocated objects.");
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}
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for (; mpool.getUsage().getUsed() >=
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mpool.getUsageThreshold();) {
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// clear all allocated objects and invoke GC
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objectPool.clear();
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mm.gc();
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if (trace) {
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iterations++;
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System.out.println("SweeperThread called " + iterations +
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" time(s) MemoryMXBean.gc().");
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}
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goSleep(100);
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}
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}
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@Override
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public void run() {
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for (int i = 1; i <= NUM_TRIGGERS; i++) {
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// Sync with AllocatorThread's first phase.
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phaser.arriveAndAwaitAdvance();
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System.out.println("SweeperThread is doing task " + i +
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" phase " + phaser.getPhase());
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doTask();
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listenerInvoked = false;
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// Sync with AllocatorThread's second phase.
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phaser.arriveAndAwaitAdvance();
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System.out.println("SweeperThread done task " + i +
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" phase " + phaser.getPhase());
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if (testFailed) return;
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}
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}
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}
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}
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