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annotate test/gc/g1/TestHumongousShrinkHeap.java @ 20461:9b8bd21b6823

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8056237: [TESTBUG] gc/g1/TestHumongousShrinkHeap.java fails due to OOM Summary: Added respect for available memory. Renamed function names Reviewed-by: jwilhelm, tschatzl Contributed-by: andrey.x.zakharov@oracle.com
author jwilhelm
date Thu, 11 Sep 2014 14:21:24 +0200
parents b1266b08b994
children 7a6313074325
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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=12 -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 List<List<byte[]>> garbage = new ArrayList();
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45 private static final int REGION_SIZE = 1024 * 1024; // 1M
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46 private static final int LISTS_COUNT = 10;
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47 private static final int HUMON_SIZE = Math.round(.9f * REGION_SIZE);
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48 private static final long AVAILABLE_MEMORY
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49 = Runtime.getRuntime().freeMemory();
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50 private static final int HUMON_COUNT
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51 = (int) ((AVAILABLE_MEMORY / HUMON_SIZE)
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52 / LISTS_COUNT);
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53
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54
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55 public static void main(String[] args) {
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56 System.out.format("Running with %s max heap size. "
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57 + "Will allocate humongous object of %s size %d times.%n",
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58 MemoryUsagePrinter.humanReadableByteCount(AVAILABLE_MEMORY, false),
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59 MemoryUsagePrinter.humanReadableByteCount(HUMON_SIZE, false),
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60 HUMON_COUNT
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61 );
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62 new TestHumongousShrinkHeap().test();
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63 }
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64
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65 private final void test() {
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66 System.gc();
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67 MemoryUsagePrinter.printMemoryUsage("init");
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68
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69 allocate();
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70 MemoryUsagePrinter.printMemoryUsage("allocated");
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71 MemoryUsage muFull = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
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72
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73 free();
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74 MemoryUsagePrinter.printMemoryUsage("free");
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75 MemoryUsage muFree = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
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76
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77 assertLessThan(muFree.getCommitted(), muFull.getCommitted(), String.format(
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78 "committed free heap size is not less than committed full heap size, heap hasn't been shrunk?%n"
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79 + "%s = %s%n%s = %s",
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80 MIN_FREE_RATIO_FLAG_NAME,
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81 ManagementFactoryHelper.getDiagnosticMXBean().getVMOption(MIN_FREE_RATIO_FLAG_NAME).getValue(),
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82 MAX_FREE_RATIO_FLAG_NAME,
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83 ManagementFactoryHelper.getDiagnosticMXBean().getVMOption(MAX_FREE_RATIO_FLAG_NAME).getValue()
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84 ));
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85 }
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86
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87 private void allocate() {
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88
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89 for (int i = 0; i < LISTS_COUNT; i++) {
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90 List<byte[]> stuff = new ArrayList();
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91 allocateList(stuff, HUMON_COUNT, HUMON_SIZE);
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92 MemoryUsagePrinter.printMemoryUsage("allocate #" + (i+1));
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93 garbage.add(stuff);
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94 }
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95 }
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96
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97 private void free() {
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98 // do not free last one list
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99 garbage.subList(0, garbage.size() - 1).clear();
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100
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101 // do not free last one element from last list
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102 List stuff = garbage.get(garbage.size() - 1);
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103 stuff.subList(0, stuff.size() - 1).clear();
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104 System.gc();
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105 }
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106
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107 private static void allocateList(List garbage, int count, int size) {
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108 for (int i = 0; i < count; i++) {
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109 garbage.add(new byte[size]);
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110 }
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111 }
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112 }
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113
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114 /**
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115 * Prints memory usage to standard output
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116 */
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117 class MemoryUsagePrinter {
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118
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119 public static String humanReadableByteCount(long bytes, boolean si) {
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120 int unit = si ? 1000 : 1024;
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121 if (bytes < unit) {
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122 return bytes + " B";
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123 }
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124 int exp = (int) (Math.log(bytes) / Math.log(unit));
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125 String pre = (si ? "kMGTPE" : "KMGTPE").charAt(exp - 1) + (si ? "" : "i");
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126 return String.format("%.1f %sB", bytes / Math.pow(unit, exp), pre);
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127 }
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128
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129 public static void printMemoryUsage(String label) {
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130 MemoryUsage memusage = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
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131 float freeratio = 1f - (float) memusage.getUsed() / memusage.getCommitted();
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132 System.out.format("[%-24s] init: %-7s, used: %-7s, comm: %-7s, freeRatio ~= %.1f%%%n",
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133 label,
20461
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134 humanReadableByteCount(memusage.getInit(), false),
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135 humanReadableByteCount(memusage.getUsed(), false),
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136 humanReadableByteCount(memusage.getCommitted(), false),
20381
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137 freeratio * 100
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138 );
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139 }
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140 }