107 lines
4.5 KiB
Java
107 lines
4.5 KiB
Java
/*
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* Copyright (c) 2018, 2019, 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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package gc.g1;
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/**
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* @test TestPeriodicCollection
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* @requires vm.gc.G1
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* @requires vm.compMode != "Xcomp"
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* @summary Verify that heap shrinks when the application is idle.
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* @library /test/lib /
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* @modules java.base/jdk.internal.misc
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* @modules java.management/sun.management
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* @run main/othervm -XX:MaxNewSize=32M -XX:InitialHeapSize=48M -Xmx128M -XX:MinHeapFreeRatio=5 -XX:MaxHeapFreeRatio=25 -XX:+UseG1GC -XX:G1PeriodicGCInterval=3000 -XX:+G1PeriodicGCInvokesConcurrent -Xlog:gc*,gc+periodic=debug,gc+ergo+heap=debug gc.g1.TestPeriodicCollection
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* @run main/othervm -XX:MaxNewSize=32M -XX:InitialHeapSize=48M -Xmx128M -XX:MinHeapFreeRatio=5 -XX:MaxHeapFreeRatio=25 -XX:+UseG1GC -XX:G1PeriodicGCInterval=3000 -XX:-G1PeriodicGCInvokesConcurrent -Xlog:gc*,gc+periodic=debug,gc+ergo+heap=debug gc.g1.TestPeriodicCollection
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*/
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import com.sun.management.HotSpotDiagnosticMXBean;
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import gc.testlibrary.Helpers;
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import java.lang.management.GarbageCollectorMXBean;
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import java.lang.management.ManagementFactory;
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import java.lang.management.MemoryUsage;
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import java.text.NumberFormat;
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import static jdk.test.lib.Asserts.*;
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public class TestPeriodicCollection {
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public static final String MIN_FREE_RATIO_FLAG_NAME = "MinHeapFreeRatio";
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public static final String MAX_FREE_RATIO_FLAG_NAME = "MaxHeapFreeRatio";
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private static final int IDLE_TIME = 7 * 1000;
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private static boolean gcOccurred() {
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for (GarbageCollectorMXBean b : ManagementFactory.getGarbageCollectorMXBeans()) {
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if (b.getCollectionCount() != 0) {
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return true;
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}
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}
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return false;
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}
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public static void main(String[] args) {
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MemoryUsage muInitial = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
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printMemoryUsage("initial", muInitial);
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if (gcOccurred()) {
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System.out.println("At least one garbage collection occurred. Exiting as this may have already shrunk the heap.");
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return;
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}
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try {
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Thread.sleep(IDLE_TIME);
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} catch (InterruptedException ie) {
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System.err.println("Skipped. Failed to wait for idle collection");
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}
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MemoryUsage muAfter = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
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printMemoryUsage("after", muAfter);
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assertLessThan(muAfter.getCommitted(), muInitial.getCommitted(), String.format(
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"committed free heap size is not less than committed full heap size, heap hasn't been shrunk?%n"
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+ "%s = %s%n%s = %s",
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MIN_FREE_RATIO_FLAG_NAME,
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ManagementFactory.getPlatformMXBean(HotSpotDiagnosticMXBean.class)
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.getVMOption(MIN_FREE_RATIO_FLAG_NAME).getValue(),
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MAX_FREE_RATIO_FLAG_NAME,
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ManagementFactory.getPlatformMXBean(HotSpotDiagnosticMXBean.class)
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.getVMOption(MAX_FREE_RATIO_FLAG_NAME).getValue()
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));
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}
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public static final NumberFormat NF = Helpers.numberFormatter();
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public static void printMemoryUsage(String label, MemoryUsage memusage) {
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float freeratio = 1f - (float) memusage.getUsed() / memusage.getCommitted();
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System.out.format("[%-24s] init: %-7s, used: %-7s, comm: %-7s, freeRatio ~= %.1f%%%n",
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label,
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NF.format(memusage.getInit()),
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NF.format(memusage.getUsed()),
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NF.format(memusage.getCommitted()),
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freeratio * 100
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);
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}
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}
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