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annotate test/gc/g1/TestHumongousShrinkHeap.java @ 21259:bbaa8ee85da8
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author | Tom Rodriguez <tom.rodriguez@oracle.com> |
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date | Mon, 04 May 2015 23:38:38 -0700 |
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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 |
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28 * due to humongous objects |
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29 * @library /testlibrary |
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30 * @run main/othervm -XX:-ExplicitGCInvokesConcurrent -XX:MinHeapFreeRatio=10 |
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31 * -XX:MaxHeapFreeRatio=12 -XX:+UseG1GC -XX:G1HeapRegionSize=1M -verbose:gc |
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32 * TestHumongousShrinkHeap |
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33 */ |
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34 |
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35 import java.lang.management.ManagementFactory; |
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36 import java.lang.management.MemoryUsage; |
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37 import java.util.ArrayList; |
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38 import java.util.List; |
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39 import sun.management.ManagementFactoryHelper; |
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40 import static com.oracle.java.testlibrary.Asserts.*; |
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41 |
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42 public class TestHumongousShrinkHeap { |
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43 |
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44 public static final String MIN_FREE_RATIO_FLAG_NAME = "MinHeapFreeRatio"; |
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45 public static final String MAX_FREE_RATIO_FLAG_NAME = "MaxHeapFreeRatio"; |
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46 |
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47 private static final List<List<byte[]>> garbage = new ArrayList(); |
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48 private static final int REGION_SIZE = 1024 * 1024; // 1M |
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49 private static final int LISTS_COUNT = 10; |
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50 private static final int HUMON_SIZE = Math.round(.9f * REGION_SIZE); |
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51 private static final long AVAILABLE_MEMORY |
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52 = Runtime.getRuntime().freeMemory(); |
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53 private static final int HUMON_COUNT |
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54 = (int) ((AVAILABLE_MEMORY / HUMON_SIZE) |
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55 / LISTS_COUNT); |
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56 |
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57 |
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58 public static void main(String[] args) { |
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59 System.out.format("Running with %s max heap size. " |
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60 + "Will allocate humongous object of %s size %d times.%n", |
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61 MemoryUsagePrinter.humanReadableByteCount(AVAILABLE_MEMORY, false), |
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62 MemoryUsagePrinter.humanReadableByteCount(HUMON_SIZE, false), |
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63 HUMON_COUNT |
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64 ); |
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65 new TestHumongousShrinkHeap().test(); |
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66 } |
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67 |
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68 private final void test() { |
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69 System.gc(); |
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70 MemoryUsagePrinter.printMemoryUsage("init"); |
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71 |
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72 allocate(); |
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73 MemoryUsagePrinter.printMemoryUsage("allocated"); |
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74 MemoryUsage muFull = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage(); |
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75 |
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76 free(); |
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77 MemoryUsagePrinter.printMemoryUsage("free"); |
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78 MemoryUsage muFree = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage(); |
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79 |
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80 assertLessThan(muFree.getCommitted(), muFull.getCommitted(), String.format( |
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81 "committed free heap size is not less than committed full heap size, heap hasn't been shrunk?%n" |
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82 + "%s = %s%n%s = %s", |
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83 MIN_FREE_RATIO_FLAG_NAME, |
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84 ManagementFactoryHelper.getDiagnosticMXBean().getVMOption(MIN_FREE_RATIO_FLAG_NAME).getValue(), |
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85 MAX_FREE_RATIO_FLAG_NAME, |
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86 ManagementFactoryHelper.getDiagnosticMXBean().getVMOption(MAX_FREE_RATIO_FLAG_NAME).getValue() |
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87 )); |
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88 } |
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89 |
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90 private void allocate() { |
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91 |
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92 for (int i = 0; i < LISTS_COUNT; i++) { |
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93 List<byte[]> stuff = new ArrayList(); |
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94 allocateList(stuff, HUMON_COUNT, HUMON_SIZE); |
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95 MemoryUsagePrinter.printMemoryUsage("allocate #" + (i+1)); |
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96 garbage.add(stuff); |
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97 } |
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98 } |
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99 |
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100 private void free() { |
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101 // do not free last one list |
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102 garbage.subList(0, garbage.size() - 1).clear(); |
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103 |
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104 // do not free last one element from last list |
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105 List stuff = garbage.get(garbage.size() - 1); |
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106 stuff.subList(0, stuff.size() - 1).clear(); |
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107 System.gc(); |
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108 } |
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109 |
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110 private static void allocateList(List garbage, int count, int size) { |
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111 for (int i = 0; i < count; i++) { |
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112 garbage.add(new byte[size]); |
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113 } |
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114 } |
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115 } |
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116 |
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117 /** |
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118 * Prints memory usage to standard output |
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119 */ |
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120 class MemoryUsagePrinter { |
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121 |
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122 public static String humanReadableByteCount(long bytes, boolean si) { |
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123 int unit = si ? 1000 : 1024; |
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124 if (bytes < unit) { |
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125 return bytes + " B"; |
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126 } |
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127 int exp = (int) (Math.log(bytes) / Math.log(unit)); |
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128 String pre = (si ? "kMGTPE" : "KMGTPE").charAt(exp - 1) + (si ? "" : "i"); |
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129 return String.format("%.1f %sB", bytes / Math.pow(unit, exp), pre); |
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130 } |
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131 |
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132 public static void printMemoryUsage(String label) { |
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133 MemoryUsage memusage = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage(); |
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134 float freeratio = 1f - (float) memusage.getUsed() / memusage.getCommitted(); |
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135 System.out.format("[%-24s] init: %-7s, used: %-7s, comm: %-7s, freeRatio ~= %.1f%%%n", |
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136 label, |
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137 humanReadableByteCount(memusage.getInit(), false), |
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138 humanReadableByteCount(memusage.getUsed(), false), |
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139 humanReadableByteCount(memusage.getCommitted(), false), |
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140 freeratio * 100 |
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141 ); |
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142 } |
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143 } |