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annotate test/gc/g1/TestHumongousShrinkHeap.java @ 20381:09e9e5240710

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8037925: CMM Testing: an allocated humongous object at the end of the heap should not prevents shrinking the heap Summary: New test added. Reviewed-by: ehelin, tschatzl, jwilhelm Contributed-by: andrey.x.zakharov@oracle.com
author jwilhelm
date Wed, 03 Sep 2014 09:23:58 +0200
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children b1266b08b994
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1 /*
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2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23
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24 /**
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25 * @test TestHumongousShrinkHeap
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26 * @bug 8036025
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27 * @summary Verify that heap shrinks after GC in the presence of fragmentation due to humongous objects
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28 * @library /testlibrary
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29 * @run main/othervm -XX:MinHeapFreeRatio=10 -XX:MaxHeapFreeRatio=50 -XX:+UseG1GC -XX:G1HeapRegionSize=1M -verbose:gc TestHumongousShrinkHeap
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30 */
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31
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32 import java.lang.management.ManagementFactory;
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33 import java.lang.management.MemoryUsage;
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34 import java.util.ArrayList;
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35 import java.util.List;
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36 import sun.management.ManagementFactoryHelper;
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37 import static com.oracle.java.testlibrary.Asserts.*;
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38
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39 public class TestHumongousShrinkHeap {
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40
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41 public static final String MIN_FREE_RATIO_FLAG_NAME = "MinHeapFreeRatio";
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42 public static final String MAX_FREE_RATIO_FLAG_NAME = "MaxHeapFreeRatio";
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43
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44 private static final ArrayList<ArrayList<byte[]>> garbage = new ArrayList<>();
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45 private static final int PAGE_SIZE = 1024 * 1024; // 1M
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46 private static final int PAGES_NUM = 5;
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47
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48
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49 public static void main(String[] args) {
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50 new TestHumongousShrinkHeap().test();
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51 }
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52
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53 private final void test() {
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54 System.gc();
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55 MemoryUsagePrinter.printMemoryUsage("init");
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56
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57 eat();
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58 MemoryUsagePrinter.printMemoryUsage("eaten");
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59 MemoryUsage muFull = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
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60
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61 free();
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62 MemoryUsagePrinter.printMemoryUsage("free");
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63 MemoryUsage muFree = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
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64
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65 assertLessThan(muFree.getCommitted(), muFull.getCommitted(), String.format(
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66 "committed free heap size is not less than committed full heap size, heap hasn't been shrunk?%n"
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67 + "%s = %s%n%s = %s",
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68 MIN_FREE_RATIO_FLAG_NAME,
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69 ManagementFactoryHelper.getDiagnosticMXBean().getVMOption(MIN_FREE_RATIO_FLAG_NAME).getValue(),
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70 MAX_FREE_RATIO_FLAG_NAME,
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71 ManagementFactoryHelper.getDiagnosticMXBean().getVMOption(MAX_FREE_RATIO_FLAG_NAME).getValue()
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72 ));
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73 }
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74
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75 private void eat() {
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76 int HumongousObjectSize = Math.round(.9f * PAGE_SIZE);
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77 System.out.println("Will allocate objects of size=" +
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78 MemoryUsagePrinter.humanReadableByteCount(HumongousObjectSize, true));
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79
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80 for (int i = 0; i < PAGES_NUM; i++) {
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81 ArrayList<byte[]> stuff = new ArrayList<>();
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82 eatList(stuff, 100, HumongousObjectSize);
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83 MemoryUsagePrinter.printMemoryUsage("eat #" + i);
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84 garbage.add(stuff);
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85 }
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86 }
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87
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88 private void free() {
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89 // do not free last one list
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90 garbage.subList(0, garbage.size() - 1).clear();
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91
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92 // do not free last one element from last list
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93 ArrayList stuff = garbage.get(garbage.size() - 1);
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94 stuff.subList(0, stuff.size() - 1).clear();
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95 System.gc();
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96 }
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97
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98 private static void eatList(List garbage, int count, int size) {
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99 for (int i = 0; i < count; i++) {
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100 garbage.add(new byte[size]);
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101 }
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102 }
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103 }
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104
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105 /**
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106 * Prints memory usage to standard output
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107 */
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108 class MemoryUsagePrinter {
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109
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110 public static String humanReadableByteCount(long bytes, boolean si) {
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111 int unit = si ? 1000 : 1024;
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112 if (bytes < unit) {
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113 return bytes + " B";
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114 }
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115 int exp = (int) (Math.log(bytes) / Math.log(unit));
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116 String pre = (si ? "kMGTPE" : "KMGTPE").charAt(exp - 1) + (si ? "" : "i");
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117 return String.format("%.1f %sB", bytes / Math.pow(unit, exp), pre);
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118 }
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119
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120 public static void printMemoryUsage(String label) {
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121 MemoryUsage memusage = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
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122 float freeratio = 1f - (float) memusage.getUsed() / memusage.getCommitted();
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123 System.out.format("[%-24s] init: %-7s, used: %-7s, comm: %-7s, freeRatio ~= %.1f%%%n",
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124 label,
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125 humanReadableByteCount(memusage.getInit(), true),
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126 humanReadableByteCount(memusage.getUsed(), true),
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127 humanReadableByteCount(memusage.getCommitted(), true),
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128 freeratio * 100
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129 );
09e9e5240710 8037925: CMM Testing: an allocated humongous object at the end of the heap should not prevents shrinking the heap
jwilhelm
parents:
diff changeset
130 }
09e9e5240710 8037925: CMM Testing: an allocated humongous object at the end of the heap should not prevents shrinking the heap
jwilhelm
parents:
diff changeset
131 }