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annotate test/gc/g1/TestHumongousShrinkHeap.java @ 21375:fef56da8474e

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Relax assertion to allow MethodIdHolders that have pre-assigned ids
author Christian Wimmer <christian.wimmer@oracle.com>
date Thu, 14 May 2015 15:59:14 -0700
parents 7a6313074325
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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),
20381
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140 freeratio * 100
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141 );
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142 }
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143 }