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annotate test/gc/g1/TestGreyReclaimedHumongousObjects.java @ 24234:ea6f94ab283b default tip

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Added tag jvmci-0.36 for changeset 8128b98d4736
author Gilles Duboscq <gilles.m.duboscq@oracle.com>
date Mon, 18 Sep 2017 18:49:45 +0200
parents b7c8142a9e0b
children
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1 /*
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2 * Copyright (c) 2015, 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 TestGreyReclaimedHumongousObjects.java
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26 * @bug 8069367
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27 * @requires vm.gc == "G1" | vm.gc == "null"
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28 * @summary Test handling of marked but unscanned reclaimed humongous objects.
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29 * @key gc
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30 * @run main/othervm -XX:+UseG1GC -Xss32m -Xmx128m -XX:G1HeapRegionSize=1m
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31 * -XX:+UnlockExperimentalVMOptions
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32 * -XX:+G1EagerReclaimHumongousObjects
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33 * -XX:+G1EagerReclaimHumongousObjectsWithStaleRefs
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34 * TestGreyReclaimedHumongousObjects 1048576 90
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35 */
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36
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37 // This test spawns a bunch of threads, each of them rapidly
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38 // allocating large objects and storing them into a circular buffer
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39 // associated with the thread. The circular buffer results in these
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40 // objects becoming dead in fairly short order.
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41 //
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42 // The situation we're trying to provoke is
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43 //
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44 // (1) A humongous object H is marked and added to the mark stack.
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45 //
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46 // (2) An evacuation pause determines H is no longer live, and
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47 // reclaims it. This occurs before concurrent marking has gotten
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48 // around to processing the mark stack entry for H.
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49 //
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50 // (3) Concurrent marking processes the mark stack entry for H. The
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51 // bug is that it would attempt to scan the now dead object.
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52 //
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53 // Unfortunately, this test is *very* sensitive to configuration.
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54 // Among the parameters that affect whether / how often we'll get into
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55 // the desired situation within a reasonable amount of time are:
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56 //
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57 // - THREAD_COUNT: The number of allocating threads.
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58 //
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59 // - OLD_COUNT: The number of objects each thread keeps.
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60 //
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61 // - MAX_MEMORY: The maximum heap size.
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62 //
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63 // - G1HeapRegionSize
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64 //
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65 // - The size of the objects being allocated.
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66 //
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67 // The parameter values specified here:
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68 //
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69 // - THREAD_COUNT = 12
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70 // - OLD_COUNT == 4
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71 // - MAX_MEMORY == 128m
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72 // - G1HeapRegionSize = 1m
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73 // - Object size = 1048576 (2 regions after header overhead and roundup)
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74 //
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75 // seems to work well at provoking the desired state fairly quickly.
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76 // Even relatively small perturbations may change that. The key
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77 // factors seem to be keeping the heap mostly full of live objects but
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78 // having them become dead fairly quickly.
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79
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80 import java.util.Date;
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81 import java.util.concurrent.ExecutorService;
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82 import java.util.concurrent.Executors;
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83 import java.util.concurrent.ThreadFactory;
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84 import java.util.concurrent.TimeUnit;
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85 import sun.management.ManagementFactoryHelper;
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86 import com.sun.management.HotSpotDiagnosticMXBean;
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87 import com.sun.management.VMOption;
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88
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89 public class TestGreyReclaimedHumongousObjects {
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90
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91 static class NamedThreadFactory implements ThreadFactory {
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92 private int threadNum = 0;
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93
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94 @Override
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95 public Thread newThread(Runnable r) {
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96 return new Thread(r, THREAD_NAME + (threadNum++));
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97 }
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98 }
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99
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100 static class Runner extends Thread {
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101 private final Date startDate = new Date();
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102 private final int obj_size;
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103 private final Object[] old_garbage;
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104 private int old_index = 0;
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105
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106 public Runner(int obj_size) {
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107 this.obj_size = obj_size;
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108 old_garbage = new Object[OLD_COUNT];
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109 }
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110
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111 private void allocate_garbage() {
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112 byte[] garbage = new byte[obj_size];
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113 old_garbage[Math.abs(++old_index % OLD_COUNT)] = garbage;
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114 }
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115
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116 @Override
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117 public void run() {
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118 try {
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119 while (!isInterrupted()) {
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120 allocate_garbage();
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121 Thread.sleep(0); // Yield, to ensure interruptable.
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122 }
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123 } catch (InterruptedException e) {
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124 System.out.println("Aborted after "
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125 + (new Date().getTime() - startDate.getTime())
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126 + " ms");
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127 interrupt();
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128 }
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129 }
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130 }
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131
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132 public static void main(String[] args) throws Exception {
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133 HotSpotDiagnosticMXBean diagnostic = ManagementFactoryHelper.getDiagnosticMXBean();
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134
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135 System.out.println("Max memory= " + MAX_MEMORY + " bytes");
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136
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137 int obj_size = 0;
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138 long seconds_to_run = 0;
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139 if (args.length != 2) {
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140 throw new RuntimeException("Object size argument must be supplied");
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141 } else {
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142 obj_size = Integer.parseInt(args[0]);
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143 seconds_to_run = Integer.parseInt(args[1]);
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144 }
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145 System.out.println("Objects size= " + obj_size + " bytes");
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146 System.out.println("Seconds to run=" + seconds_to_run);
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147
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148 int region_size =
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149 Integer.parseInt(diagnostic.getVMOption("G1HeapRegionSize").getValue());
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150 if (obj_size < (region_size / 2)) {
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151 throw new RuntimeException("Object size " + obj_size +
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152 " is not humongous with region size " + region_size);
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153 }
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154
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155 ExecutorService executor =
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156 Executors.newFixedThreadPool(THREAD_COUNT, new NamedThreadFactory());
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157 System.out.println("Starting " + THREAD_COUNT + " threads");
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158
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159 for (int i = 0; i < THREAD_COUNT; i++) {
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160 executor.execute(new Runner(obj_size));
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161 }
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162
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163 Thread.sleep(seconds_to_run * 1000);
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164 executor.shutdownNow();
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165
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166 if (!executor.awaitTermination(10, TimeUnit.SECONDS)) {
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167 System.err.println("Thread pool did not terminate after 10 seconds after shutdown");
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168 }
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169 }
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170
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171 private static final long MAX_MEMORY = Runtime.getRuntime().maxMemory();
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172 private static final int OLD_COUNT = 4;
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173 private static final int THREAD_COUNT = 12;
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174 private static final String THREAD_NAME = "TestGreyRH-";
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175 }
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176