Mercurial > hg > graal-jvmci-8
annotate test/gc/g1/TestHumongousShrinkHeap.java @ 20382:b1266b08b994
8056043: Heap does not shrink within the heap after JDK-8038423
Summary: Enable shrinking within the heap by removing some code added for JDK-8054818. Enable the test case that checks that again too.
Reviewed-by: jwilhelm, jmasa
author | tschatzl |
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date | Wed, 03 Sep 2014 09:24:07 +0200 |
parents | 09e9e5240710 |
children | 9b8bd21b6823 |
rev | line source |
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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 8056043 |
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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 ); |
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130 } |
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131 } |