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annotate test/gc/g1/TestShrinkDefragmentedHeap.java @ 20470:bc4ce33c0985

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8049529: LogCompilation: annotate make_not_compilable with compilation level Reviewed-by: roland, iveresov
author vlivanov
date Mon, 14 Jul 2014 03:27:21 -0700
parents df66e3a3c4c2
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 TestShrinkDefragmentedHeap
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26 * @bug 8038423
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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 * 1. allocate small objects mixed with humongous ones
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29 * "ssssHssssHssssHssssHssssHssssHssssH"
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30 * 2. release all allocated object except the last humongous one
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31 * "..................................H"
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32 * 3. invoke gc and check that memory returned to the system (amount of committed memory got down)
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33 *
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34 * @library /testlibrary
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35 */
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36 import java.lang.management.ManagementFactory;
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37 import java.lang.management.MemoryUsage;
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38 import java.util.ArrayList;
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39 import java.util.List;
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40 import sun.management.ManagementFactoryHelper;
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41 import static com.oracle.java.testlibrary.Asserts.*;
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42 import com.oracle.java.testlibrary.ProcessTools;
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43 import com.oracle.java.testlibrary.OutputAnalyzer;
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44
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45 public class TestShrinkDefragmentedHeap {
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46 // Since we store all the small objects, they become old and old regions are also allocated at the bottom of the heap
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47 // together with humongous regions. So if there are a lot of old regions in the lower part of the heap,
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48 // the humongous regions will be allocated in the upper part of the heap anyway.
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49 // To avoid this the Eden needs to be big enough to fit all the small objects.
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50 private static final int INITIAL_HEAP_SIZE = 200 * 1024 * 1024;
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51 private static final int MINIMAL_YOUNG_SIZE = 190 * 1024 * 1024;
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52 private static final int REGION_SIZE = 1 * 1024 * 1024;
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53
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54 public static void main(String[] args) throws Exception, Throwable {
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55 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
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56 "-XX:InitialHeapSize=" + INITIAL_HEAP_SIZE,
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57 "-Xmn" + MINIMAL_YOUNG_SIZE,
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58 "-XX:MinHeapFreeRatio=10",
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59 "-XX:MaxHeapFreeRatio=11",
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60 "-XX:+UseG1GC",
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61 "-XX:G1HeapRegionSize=" + REGION_SIZE,
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62 "-verbose:gc",
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63 GCTest.class.getName()
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64 );
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65
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66 OutputAnalyzer output = ProcessTools.executeProcess(pb);
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67 output.shouldHaveExitValue(0);
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68 }
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69
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70 static class GCTest {
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71
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72 private static final String MIN_FREE_RATIO_FLAG_NAME = "MinHeapFreeRatio";
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73 private static final String MAX_FREE_RATIO_FLAG_NAME = "MaxHeapFreeRatio";
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74 private static final String NEW_SIZE_FLAG_NAME = "NewSize";
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75
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76 private static final ArrayList<ArrayList<byte[]>> garbage = new ArrayList<>();
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77
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78 private static final int SMALL_OBJS_SIZE = 10 * 1024; // 10kB
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79 private static final int SMALL_OBJS_COUNT = MINIMAL_YOUNG_SIZE / (SMALL_OBJS_SIZE-1);
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80 private static final int ALLOCATE_COUNT = 3;
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81 // try to put all humongous object into gap between min young size and initial heap size
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82 // to avoid implicit GCs
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83 private static final int HUMONG_OBJS_SIZE = (int) Math.max(
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84 (INITIAL_HEAP_SIZE - MINIMAL_YOUNG_SIZE) / ALLOCATE_COUNT / 4,
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85 REGION_SIZE * 1.1
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86 );
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87
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88 private static final long initialHeapSize = getHeapMemoryUsage().getUsed();
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89
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90 public static void main(String[] args) throws InterruptedException {
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91 new GCTest().test();
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92 }
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93
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94 private void test() throws InterruptedException {
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95 MemoryUsagePrinter.printMemoryUsage("init");
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96
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97 allocate();
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98 System.gc();
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99 MemoryUsage muFull = getHeapMemoryUsage();
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100 MemoryUsagePrinter.printMemoryUsage("allocated");
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101
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102 free();
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103 //Thread.sleep(1000); // sleep before measures due lags in JMX
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104 MemoryUsage muFree = getHeapMemoryUsage();
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105 MemoryUsagePrinter.printMemoryUsage("free");
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106
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107 assertLessThan(muFree.getCommitted(), muFull.getCommitted(), prepareMessageCommittedIsNotLess() );
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108 }
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109
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110 private void allocate() {
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111 System.out.format("Will allocate objects of small size = %s and humongous size = %s",
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112 MemoryUsagePrinter.humanReadableByteCount(SMALL_OBJS_SIZE, false),
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113 MemoryUsagePrinter.humanReadableByteCount(HUMONG_OBJS_SIZE, false)
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114 );
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115
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116 for (int i = 0; i < ALLOCATE_COUNT; i++) {
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117 ArrayList<byte[]> stuff = new ArrayList<>();
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118 allocateList(stuff, SMALL_OBJS_COUNT / ALLOCATE_COUNT, SMALL_OBJS_SIZE);
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119 garbage.add(stuff);
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120
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121 ArrayList<byte[]> humongousStuff = new ArrayList<>();
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122 allocateList(humongousStuff, 4, HUMONG_OBJS_SIZE);
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123 garbage.add(humongousStuff);
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124 }
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125 }
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126
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127 private void free() {
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128 // do not free last one list
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129 garbage.subList(0, garbage.size() - 1).clear();
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130
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131 // do not free last one element from last list
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132 ArrayList stuff = garbage.get(garbage.size() - 1);
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133 if (stuff.size() > 1) {
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134 stuff.subList(0, stuff.size() - 1).clear();
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135 }
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136 System.gc();
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137 }
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138
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139 private String prepareMessageCommittedIsNotLess() {
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140 return String.format(
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141 "committed free heap size is not less than committed full heap size, heap hasn't been shrunk?%n"
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142 + "%s = %s%n%s = %s",
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143 MIN_FREE_RATIO_FLAG_NAME,
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144 ManagementFactoryHelper.getDiagnosticMXBean().getVMOption(MIN_FREE_RATIO_FLAG_NAME).getValue(),
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145 MAX_FREE_RATIO_FLAG_NAME,
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146 ManagementFactoryHelper.getDiagnosticMXBean().getVMOption(MAX_FREE_RATIO_FLAG_NAME).getValue()
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147 );
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148 }
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149
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150 private static void allocateList(List garbage, int count, int size) {
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151 for (int i = 0; i < count; i++) {
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152 garbage.add(new byte[size]);
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153 }
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154 }
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155 }
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156
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157 static MemoryUsage getHeapMemoryUsage() {
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158 return ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
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159 }
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160
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161 /**
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162 * Prints memory usage to standard output
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163 */
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164 static class MemoryUsagePrinter {
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165
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166 public static String humanReadableByteCount(long bytes, boolean si) {
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167 int unit = si ? 1000 : 1024;
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168 if (bytes < unit) {
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169 return bytes + " B";
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170 }
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171 int exp = (int) (Math.log(bytes) / Math.log(unit));
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172 String pre = (si ? "kMGTPE" : "KMGTPE").charAt(exp - 1) + (si ? "" : "i");
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173 return String.format("%.1f %sB", bytes / Math.pow(unit, exp), pre);
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174 }
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175
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176 public static void printMemoryUsage(String label) {
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177 MemoryUsage memusage = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
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178 float freeratio = 1f - (float) memusage.getUsed() / memusage.getCommitted();
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179 System.out.format("[%-24s] init: %-7s, used: %-7s, comm: %-7s, freeRatio ~= %.1f%%%n",
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180 label,
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181 humanReadableByteCount(memusage.getInit(), false),
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182 humanReadableByteCount(memusage.getUsed(), false),
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183 humanReadableByteCount(memusage.getCommitted(), false),
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184 freeratio * 100
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185 );
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186 }
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187 }
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188 }