122 lines
4.6 KiB
Java
122 lines
4.6 KiB
Java
/*
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* Copyright (c) 2014, 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.parallel;
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/**
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* @test TestDynShrinkHeap
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* @bug 8016479
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* @requires vm.gc.Parallel & os.maxMemory > 1G
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* @summary Verify that the heap shrinks after full GC according to the current values of the Min/MaxHeapFreeRatio flags
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* @modules java.base/jdk.internal.misc
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* @modules jdk.management
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* @library /test/lib /
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* @run main/othervm -XX:+UseAdaptiveSizePolicyWithSystemGC -XX:+UseParallelGC -XX:MinHeapFreeRatio=0 -XX:MaxHeapFreeRatio=100 -Xmx1g -verbose:gc gc.parallel.TestDynShrinkHeap
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*/
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import jdk.test.lib.management.DynamicVMOption;
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import java.lang.management.ManagementFactory;
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import java.lang.management.MemoryUsage;
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import java.util.ArrayList;
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import java.text.NumberFormat;
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import static jdk.test.lib.Asserts.assertLessThan;
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import com.sun.management.HotSpotDiagnosticMXBean;
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import gc.testlibrary.Helpers;
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public class TestDynShrinkHeap {
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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 ArrayList<byte[]> list = new ArrayList<>(0);
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private static final int LEN = 512 * 1024 + 1;
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public TestDynShrinkHeap() {
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}
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private final void test() {
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System.gc();
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MemoryUsagePrinter.printMemoryUsage("init");
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eat();
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MemoryUsagePrinter.printMemoryUsage("eaten");
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MemoryUsage muFull = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
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free();
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MemoryUsagePrinter.printMemoryUsage("free");
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MemoryUsage muFree = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
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assertLessThan(muFree.getCommitted(), muFull.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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private void eat() {
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for (int i = 0; i < LEN; i++) {
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list.add(new byte[1024]);
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}
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MemoryUsagePrinter.printMemoryUsage("allocated " + LEN + " arrays");
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list.subList(0, LEN / 2).clear();
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System.gc();
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MemoryUsagePrinter.printMemoryUsage("array halved");
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}
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private void free() {
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int min = DynamicVMOption.getInt(MIN_FREE_RATIO_FLAG_NAME);
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DynamicVMOption.setInt(MAX_FREE_RATIO_FLAG_NAME, min);
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System.gc();
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MemoryUsagePrinter.printMemoryUsage("under pressure");
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}
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public static void main(String[] args) {
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new TestDynShrinkHeap().test();
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}
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}
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/**
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* Prints memory usage to standard output
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*/
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class MemoryUsagePrinter {
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public static final NumberFormat NF = Helpers.numberFormatter();
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public static void printMemoryUsage(String label) {
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MemoryUsage memusage = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
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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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