1 /* |
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2 * Copyright (c) 2004, 2019, 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 package gc.cms; |
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25 |
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26 import java.lang.ref.ReferenceQueue; |
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27 import java.lang.ref.WeakReference; |
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28 import java.util.LinkedList; |
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29 import java.util.ListIterator; |
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30 |
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31 /* |
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32 * @test |
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33 * @requires vm.gc.ConcMarkSweep & !vm.graal.enabled |
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34 * @key cte_test |
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35 * @bug 4950157 |
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36 * @summary Stress the behavior of ergonomics when the heap is nearly full and |
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37 * stays nearly full. |
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38 * @run main/othervm |
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39 * -XX:+UseConcMarkSweepGC -XX:-CMSYield -XX:-CMSPrecleanRefLists1 |
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40 * -XX:CMSInitiatingOccupancyFraction=0 -Xmx80m gc.cms.TestBubbleUpRef 16000 50 10000 |
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41 */ |
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42 |
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43 /** |
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44 * Test program to stress the behavior of ergonomics when the |
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45 * heap is nearly full and stays nearly full. |
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46 * This is a test to catch references that have been discovered |
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47 * during concurrent marking and whose referents have been |
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48 * cleared by the mutator. |
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49 * Allocate objects with weak references until the heap is full |
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50 * Free the objects. |
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51 * Do work so that concurrent marking has a chance to work |
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52 * Clear the referents out of the weak references |
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53 * System.gc() in the hopes that it will acquire the collection |
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54 * Free the weak references |
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55 * Do it again. |
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56 * |
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57 * Use the following VM options |
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58 * -Xmx80m -XX:-CMSYield [-XX:+UseConcMarkSweepGC] -XX:-CMSPrecleanRefLists1 |
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59 * -XX:CMSInitiatingOccupancyFraction=0 |
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60 * |
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61 * Use parameter: |
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62 * args[0] - array size (16000) |
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63 * args[1] - iterations (50) |
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64 * args[2] - work (10000) |
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65 */ |
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66 class MyList extends LinkedList { |
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67 |
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68 int[] a; |
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69 |
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70 MyList(int size) { |
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71 a = new int[size]; |
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72 } |
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73 } |
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74 |
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75 class MyRefList extends LinkedList { |
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76 |
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77 WeakReference ref; |
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78 |
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79 MyRefList(Object o, ReferenceQueue rq) { |
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80 ref = new WeakReference(o, rq); |
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81 } |
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82 |
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83 void clearReferent() { |
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84 ref.clear(); |
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85 } |
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86 } |
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87 |
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88 public class TestBubbleUpRef { |
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89 |
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90 MyList list; |
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91 MyRefList refList; |
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92 ReferenceQueue rq; |
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93 int refListLen; |
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94 int arraySize; |
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95 int iterations; |
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96 int workUnits; |
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97 |
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98 TestBubbleUpRef(int as, int cnt, int wk) { |
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99 arraySize = as; |
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100 iterations = cnt; |
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101 workUnits = wk; |
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102 list = new MyList(arraySize); |
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103 refList = new MyRefList(list, rq); |
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104 } |
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105 |
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106 public void fill() { |
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107 System.out.println("fill() " + iterations + " times"); |
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108 int count = 0; |
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109 while (true) { |
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110 try { |
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111 // Allocations |
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112 MyList next = new MyList(arraySize); |
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113 list.add(next); |
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114 MyRefList nextRef = new MyRefList(next, rq); |
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115 refList.add(nextRef); |
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116 } catch (OutOfMemoryError e) { |
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117 // When the heap is full |
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118 try { |
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119 if (count++ > iterations) { |
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120 return; |
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121 } |
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122 System.out.println("Freeing list"); |
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123 while (!list.isEmpty()) { |
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124 list.removeFirst(); |
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125 } |
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126 System.out.println("Doing work"); |
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127 int j = 0; |
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128 for (int i = 1; i < workUnits; i++) { |
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129 j = j + i; |
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130 } |
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131 System.out.println("Clearing refs"); |
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132 ListIterator listIt = refList.listIterator(); |
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133 while (listIt.hasNext()) { |
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134 MyRefList next = (MyRefList) listIt.next(); |
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135 next.clearReferent(); |
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136 } |
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137 System.gc(); |
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138 System.out.println("Freeing refs"); |
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139 while (!refList.isEmpty()) { |
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140 refList.removeFirst(); |
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141 } |
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142 } catch (OutOfMemoryError e2) { |
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143 System.err.println("Out of Memory - 2 "); |
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144 continue; |
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145 } |
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146 } catch (Exception e) { |
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147 System.err.println("Unexpected exception: " + e); |
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148 return; |
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149 } |
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150 } |
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151 } |
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152 |
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153 /** |
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154 * Test entry point. |
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155 * args[0] - array size (is the size of the int array in a list item) |
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156 * args[1] - iterations (is the number of out-of-memory exceptions before exit) |
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157 * args[2] - work (is the work done between allocations) |
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158 * @param args |
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159 */ |
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160 public static void main(String[] args) { |
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161 // Get the input parameters. |
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162 if (args.length != 3) { |
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163 throw new IllegalArgumentException("Wrong number of input argumets"); |
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164 } |
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165 |
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166 int as = Integer.parseInt(args[0]); |
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167 int cnt = Integer.parseInt(args[1]); |
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168 int work = Integer.parseInt(args[2]); |
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169 |
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170 System.out.println("<array size> " + as + "\n" |
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171 + "<OOM's> " + cnt + "\n" |
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172 + "<work units> " + work + "\n"); |
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173 |
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174 // Initialization |
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175 TestBubbleUpRef b = new TestBubbleUpRef(as, cnt, work); |
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176 |
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177 // Run the test |
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178 try { |
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179 b.fill(); |
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180 } catch (OutOfMemoryError e) { |
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181 b = null; // Free memory before trying to print anything |
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182 System.err.println("Out of Memory - exiting "); |
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183 } catch (Exception e) { |
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184 System.err.println("Exiting "); |
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185 } |
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186 } |
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187 } |
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188 |
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