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annotate test/gc/g1/TestShrinkAuxiliaryData.java @ 20541:e3ed86fc15ed

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8043766: CMM Testing: 8u40 Decommit auxiliary data structures Summary: Check that native memory is returned to the system when decommiting memory within the heap with G1. Reviewed-by: tschatzl, jwilhelm Contributed-by: Andrey Zakharov <andrey.x.zakharov@oracle.com>
author tschatzl
date Mon, 29 Sep 2014 09:59:23 +0200
parents
children 7a6313074325
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20541
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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 import static com.oracle.java.testlibrary.Asserts.assertLessThanOrEqual;
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25 import com.oracle.java.testlibrary.OutputAnalyzer;
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26 import com.oracle.java.testlibrary.Platform;
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27 import com.oracle.java.testlibrary.ProcessTools;
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28 import com.oracle.java.testlibrary.Utils;
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29 import java.io.IOException;
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30 import java.lang.management.ManagementFactory;
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31 import java.lang.management.MemoryUsage;
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32 import java.text.DecimalFormat;
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33 import java.text.DecimalFormatSymbols;
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34 import java.util.ArrayList;
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35 import java.util.Arrays;
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36 import java.util.Collections;
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37 import java.util.LinkedList;
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38 import java.util.List;
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39 import sun.misc.Unsafe;
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40
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41 public class TestShrinkAuxiliaryData {
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42
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43 private final static String[] initialOpts = new String[]{
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44 "-XX:MinHeapFreeRatio=10",
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45 "-XX:MaxHeapFreeRatio=11",
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46 "-XX:+UseG1GC",
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47 "-XX:G1HeapRegionSize=1m",
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48 "-XX:+PrintGCDetails"
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49 };
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50
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51 private final int RSetCacheSize;
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52
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53 protected TestShrinkAuxiliaryData(int RSetCacheSize) {
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54 this.RSetCacheSize = RSetCacheSize;
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55 }
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56
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57 protected void test() throws Exception {
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58 ArrayList<String> vmOpts = new ArrayList();
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59 Collections.addAll(vmOpts, initialOpts);
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60
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61 int maxCacheSize = Math.max(0, Math.min(31, getMaxCacheSize()));
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62 if (maxCacheSize < RSetCacheSize) {
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63 System.out.format("Skiping test for %d cache size due max cache size %d",
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64 RSetCacheSize, maxCacheSize
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65 );
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66 return;
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67 }
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68
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69 printTestInfo(maxCacheSize);
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70
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71 vmOpts.add("-XX:G1ConcRSLogCacheSize=" + RSetCacheSize);
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72
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73 vmOpts.addAll(Arrays.asList(Utils.getFilteredTestJavaOpts(
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74 ShrinkAuxiliaryDataTest.prohibitedVmOptions)));
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75
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76 // for 32 bits ObjectAlignmentInBytes is not a option
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77 if (Platform.is32bit()) {
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78 ArrayList<String> vmOptsWithoutAlign = new ArrayList(vmOpts);
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79 vmOptsWithoutAlign.add(ShrinkAuxiliaryDataTest.class.getName());
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80 performTest(vmOptsWithoutAlign);
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81 return;
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82 }
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83
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84 for (int alignment = 3; alignment <= 8; alignment++) {
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85 ArrayList<String> vmOptsWithAlign = new ArrayList(vmOpts);
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86 vmOptsWithAlign.add("-XX:ObjectAlignmentInBytes="
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87 + (int) Math.pow(2, alignment));
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88 vmOptsWithAlign.add(ShrinkAuxiliaryDataTest.class.getName());
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89
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90 performTest(vmOptsWithAlign);
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91 }
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92 }
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93
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94 private void performTest(List<String> opts) throws Exception {
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95 ProcessBuilder pb
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96 = ProcessTools.createJavaProcessBuilder(
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97 opts.toArray(new String[opts.size()])
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98 );
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99
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100 OutputAnalyzer output = new OutputAnalyzer(pb.start());
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101 output.shouldHaveExitValue(0);
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102 }
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103
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104 private void printTestInfo(int maxCacheSize) {
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105
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106 DecimalFormat grouped = new DecimalFormat("000,000");
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107 DecimalFormatSymbols formatSymbols = grouped.getDecimalFormatSymbols();
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108 formatSymbols.setGroupingSeparator(' ');
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109 grouped.setDecimalFormatSymbols(formatSymbols);
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110
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111 System.out.format("Test will use %s bytes of memory of %s available%n"
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112 + "Available memory is %s with %d bytes pointer size - can save %s pointers%n"
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113 + "Max cache size: 2^%d = %s elements%n",
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114 grouped.format(ShrinkAuxiliaryDataTest.getMemoryUsedByTest()),
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115 grouped.format(Runtime.getRuntime().freeMemory()),
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116 grouped.format(Runtime.getRuntime().freeMemory()
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117 - ShrinkAuxiliaryDataTest.getMemoryUsedByTest()),
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118 Unsafe.ADDRESS_SIZE,
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119 grouped.format((Runtime.getRuntime().freeMemory()
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120 - ShrinkAuxiliaryDataTest.getMemoryUsedByTest())
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121 / Unsafe.ADDRESS_SIZE),
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122 maxCacheSize,
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123 grouped.format((int) Math.pow(2, maxCacheSize))
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124 );
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125 }
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126
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127 /**
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128 * Detects maximum possible size of G1ConcRSLogCacheSize available for
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129 * current process based on maximum available process memory size
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130 *
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131 * @return power of two
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132 */
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133 private static int getMaxCacheSize() {
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134 long availableMemory = Runtime.getRuntime().freeMemory()
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135 - ShrinkAuxiliaryDataTest.getMemoryUsedByTest() - 1l;
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136 if (availableMemory <= 0) {
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137 return 0;
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138 }
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139 long availablePointersCount = availableMemory / Unsafe.ADDRESS_SIZE;
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140 return (63 - (int) Long.numberOfLeadingZeros(availablePointersCount));
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141 }
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142
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143 static class ShrinkAuxiliaryDataTest {
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144
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145 public static void main(String[] args) throws IOException {
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146 int iterateCount = DEFAULT_ITERATION_COUNT;
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147
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148 if (args.length > 0) {
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149 try {
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150 iterateCount = Integer.parseInt(args[0]);
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151 } catch (NumberFormatException e) {
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152 //num_iterate remains default
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153 }
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154 }
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155
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156 new ShrinkAuxiliaryDataTest().test(iterateCount);
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157 }
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158
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159 class GarbageObject {
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160
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161 private final List<byte[]> payload = new ArrayList();
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162 private final List<GarbageObject> ref = new LinkedList();
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163
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164 public GarbageObject(int size) {
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165 payload.add(new byte[size]);
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166 }
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167
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168 public void addRef(GarbageObject g) {
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169 ref.add(g);
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170 }
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171
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172 public void mutate() {
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173 if (!payload.isEmpty() && payload.get(0).length > 0) {
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174 payload.get(0)[0] = (byte) (Math.random() * Byte.MAX_VALUE);
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175 }
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176 }
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177 }
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178
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179 private final List<GarbageObject> garbage = new ArrayList();
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180
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181 public void test(int num_iterate) throws IOException {
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182
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183 allocate();
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184 link();
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185 mutate();
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186 deallocate();
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187
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188 MemoryUsage muBeforeHeap
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189 = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
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190 MemoryUsage muBeforeNonHeap
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191 = ManagementFactory.getMemoryMXBean().getNonHeapMemoryUsage();
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192
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193 for (int i = 0; i < num_iterate; i++) {
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194 allocate();
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195 link();
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196 mutate();
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197 deallocate();
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198 }
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199
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200 System.gc();
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201 MemoryUsage muAfterHeap
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202 = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
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203 MemoryUsage muAfterNonHeap
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204 = ManagementFactory.getMemoryMXBean().getNonHeapMemoryUsage();
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205
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206 assertLessThanOrEqual(muAfterHeap.getCommitted(), muBeforeHeap.getCommitted(),
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207 String.format("heap decommit failed - after > before: %d > %d",
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208 muAfterHeap.getCommitted(), muBeforeHeap.getCommitted()
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209 )
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210 );
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211
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212 if (muAfterHeap.getCommitted() < muBeforeHeap.getCommitted()) {
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213 assertLessThanOrEqual(muAfterNonHeap.getCommitted(), muBeforeNonHeap.getCommitted(),
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214 String.format("non-heap decommit failed - after > before: %d > %d",
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215 muAfterNonHeap.getCommitted(), muBeforeNonHeap.getCommitted()
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216 )
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217 );
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218 }
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219 }
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220
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221 private void allocate() {
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222 for (int r = 0; r < REGIONS_TO_ALLOCATE; r++) {
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223 for (int i = 0; i < NUM_OBJECTS_PER_REGION; i++) {
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224 GarbageObject g = new GarbageObject(REGION_SIZE
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225 / NUM_OBJECTS_PER_REGION);
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226 garbage.add(g);
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227 }
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228 }
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229 }
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230
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231 /**
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232 * Iterate through all allocated objects, and link to objects in another
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233 * regions
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234 */
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235 private void link() {
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236 for (int ig = 0; ig < garbage.size(); ig++) {
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237 int regionNumber = ig / NUM_OBJECTS_PER_REGION;
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238
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239 for (int i = 0; i < NUM_LINKS; i++) {
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240 int regionToLink;
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241 do {
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242 regionToLink = (int) (Math.random()
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243 * REGIONS_TO_ALLOCATE);
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244 } while (regionToLink == regionNumber);
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245
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246 // get random garbage object from random region
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247 garbage.get(ig).addRef(garbage.get(regionToLink
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248 * NUM_OBJECTS_PER_REGION + (int) (Math.random()
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249 * NUM_OBJECTS_PER_REGION)));
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250 }
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251 }
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252 }
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253
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254 private void mutate() {
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255 for (int ig = 0; ig < garbage.size(); ig++) {
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256 garbage.get(ig).mutate();
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257 }
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258 }
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259
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260 private void deallocate() {
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261 garbage.clear();
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262 System.gc();
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263 }
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264
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265 static long getMemoryUsedByTest() {
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266 return REGIONS_TO_ALLOCATE * REGION_SIZE;
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267 }
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268
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269 private static final int REGION_SIZE = 1024 * 1024;
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270 private static final int DEFAULT_ITERATION_COUNT = 1; // iterate main scenario
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271 private static final int REGIONS_TO_ALLOCATE = 5;
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272 private static final int NUM_OBJECTS_PER_REGION = 10;
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273 private static final int NUM_LINKS = 20; // how many links create for each object
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274
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275 private static final String[] prohibitedVmOptions = {
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276 // remove this when @requires option will be on duty
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277 "-XX:\\+UseParallelGC",
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278 "-XX:\\+UseSerialGC",
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279 "-XX:\\+UseConcMarkSweepGC",
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280 "-XX:\\+UseParallelOldGC",
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281 "-XX:\\+UseParNewGC",
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282 "-Xconcgc",
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283 "-Xincgc"
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284 };
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285 }
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286 }