193 lines
7.9 KiB
Java
193 lines
7.9 KiB
Java
/*
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* Copyright (c) 2014, 2023, 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 TestShrinkDefragmentedHeap
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* @bug 8038423 8129590
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* @summary Verify that heap shrinks after GC in the presence of fragmentation due to humongous objects
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* 1. allocate small objects mixed with humongous ones
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* "ssssHssssHssssHssssHssssHssssHssssH"
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* 2. release all allocated object except the last humongous one
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* "..................................H"
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* 3. invoke gc and check that memory returned to the system (amount of committed memory got down)
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*
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* @library /test/lib /
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* @requires vm.gc.G1
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* @modules java.base/jdk.internal.misc
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* java.management/sun.management
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* @run driver gc.g1.TestShrinkDefragmentedHeap
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*/
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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.util.List;
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import java.text.NumberFormat;
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import static jdk.test.lib.Asserts.*;
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import jdk.test.lib.process.OutputAnalyzer;
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import jdk.test.lib.process.ProcessTools;
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import com.sun.management.HotSpotDiagnosticMXBean;
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import gc.testlibrary.Helpers;
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public class TestShrinkDefragmentedHeap {
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// Since we store all the small objects, they become old and old regions are also allocated at the bottom of the heap
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// together with humongous regions. So if there are a lot of old regions in the lower part of the heap,
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// the humongous regions will be allocated in the upper part of the heap anyway.
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// To avoid this the Eden needs to be big enough to fit all the small objects.
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private static final int INITIAL_HEAP_SIZE = 200 * 1024 * 1024;
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private static final int MINIMAL_YOUNG_SIZE = 190 * 1024 * 1024;
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private static final int MAXIMUM_HEAP_SIZE = 256 * 1024 * 1024;
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private static final int REGION_SIZE = 1 * 1024 * 1024;
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public static void main(String[] args) throws Exception, Throwable {
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OutputAnalyzer output = ProcessTools.executeLimitedTestJava(
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"-XX:InitialHeapSize=" + INITIAL_HEAP_SIZE,
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"-Xmn" + MINIMAL_YOUNG_SIZE,
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"-Xmx" + MAXIMUM_HEAP_SIZE,
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"-XX:MinHeapFreeRatio=10",
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"-XX:MaxHeapFreeRatio=11",
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"-XX:+UseG1GC",
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"-XX:G1HeapRegionSize=" + REGION_SIZE,
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"-XX:-ExplicitGCInvokesConcurrent",
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"-verbose:gc",
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GCTest.class.getName()
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);
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output.shouldHaveExitValue(0);
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}
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static class GCTest {
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private static final String MIN_FREE_RATIO_FLAG_NAME = "MinHeapFreeRatio";
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private static final String MAX_FREE_RATIO_FLAG_NAME = "MaxHeapFreeRatio";
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private static final String NEW_SIZE_FLAG_NAME = "NewSize";
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private static final ArrayList<ArrayList<byte[]>> garbage = new ArrayList<>();
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private static final int SMALL_OBJS_SIZE = 10 * 1024; // 10kB
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private static final int SMALL_OBJS_COUNT = MINIMAL_YOUNG_SIZE / (SMALL_OBJS_SIZE-1);
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private static final int ALLOCATE_COUNT = 3;
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// try to put all humongous object into gap between min young size and initial heap size
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// to avoid implicit GCs
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private static final int HUMONG_OBJS_SIZE = (int) Math.max(
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(INITIAL_HEAP_SIZE - MINIMAL_YOUNG_SIZE) / ALLOCATE_COUNT / 4,
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REGION_SIZE * 1.1
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);
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private static final long initialHeapSize = getHeapMemoryUsage().getUsed();
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public static void main(String[] args) throws InterruptedException {
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new GCTest().test();
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}
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private void test() throws InterruptedException {
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MemoryUsagePrinter.printMemoryUsage("init");
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allocate();
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System.gc();
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MemoryUsage muFull = getHeapMemoryUsage();
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MemoryUsagePrinter.printMemoryUsage("allocated");
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free();
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//Thread.sleep(1000); // sleep before measures due lags in JMX
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MemoryUsage muFree = getHeapMemoryUsage();
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MemoryUsagePrinter.printMemoryUsage("free");
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assertLessThan(muFree.getCommitted(), muFull.getCommitted(), prepareMessageCommittedIsNotLess() );
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}
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private void allocate() {
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System.out.format("Will allocate objects of small size = %s and humongous size = %s",
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MemoryUsagePrinter.NF.format(SMALL_OBJS_SIZE),
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MemoryUsagePrinter.NF.format(HUMONG_OBJS_SIZE)
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);
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for (int i = 0; i < ALLOCATE_COUNT; i++) {
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ArrayList<byte[]> stuff = new ArrayList<>();
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allocateList(stuff, SMALL_OBJS_COUNT / ALLOCATE_COUNT, SMALL_OBJS_SIZE);
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garbage.add(stuff);
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ArrayList<byte[]> humongousStuff = new ArrayList<>();
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allocateList(humongousStuff, 4, HUMONG_OBJS_SIZE);
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garbage.add(humongousStuff);
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}
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}
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private void free() {
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// do not free last one list
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garbage.subList(0, garbage.size() - 1).clear();
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// do not free last one element from last list
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ArrayList<byte[]> stuff = garbage.get(garbage.size() - 1);
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if (stuff.size() > 1) {
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stuff.subList(0, stuff.size() - 1).clear();
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}
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System.gc();
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}
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private String prepareMessageCommittedIsNotLess() {
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return 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 static void allocateList(List<byte[]> garbage, int count, int size) {
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for (int i = 0; i < count; i++) {
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garbage.add(new byte[size]);
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}
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}
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}
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static MemoryUsage getHeapMemoryUsage() {
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return ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
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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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static 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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}
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