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23637
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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 TestSoftReferencesBehaviorOnOOME
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26 * @key gc
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27 * @summary Tests that all SoftReferences has been cleared at time of OOM.
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28 * @library /testlibrary
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29 * @build TestSoftReferencesBehaviorOnOOME
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30 * @run main/othervm -Xmx128m TestSoftReferencesBehaviorOnOOME 512 2k
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31 * @run main/othervm -Xmx128m TestSoftReferencesBehaviorOnOOME 128k 256k
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32 * @run main/othervm -Xmx128m TestSoftReferencesBehaviorOnOOME 2k 32k 10
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33 */
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34 import java.util.*;
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35 import com.oracle.java.testlibrary.Utils;
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36 import java.lang.ref.SoftReference;
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37 import java.util.LinkedList;
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38
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39 public class TestSoftReferencesBehaviorOnOOME {
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40
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41 private static final Random rndGenerator = new Random();
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42
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43 public static void main(String[] args) {
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44 int semiRefAllocFrequency = DEFAULT_FREQUENCY;
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45 long minSize = DEFAULT_MIN_SIZE,
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46 maxSize = DEFAULT_MAX_SIZE;
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47
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48 if ( args.length >= 3 ) {
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49 semiRefAllocFrequency = Integer.parseInt(args[2]);
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50 }
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51
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52 if ( args.length >= 2) {
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53 maxSize = getBytesCount(args[1]);
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54 }
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55
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56 if ( args.length >= 1) {
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57 minSize = getBytesCount(args[0]);
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58 }
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59
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60 new TestSoftReferencesBehaviorOnOOME().softReferencesOom(minSize, maxSize, semiRefAllocFrequency);
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61 }
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62
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63 /**
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64 * Test that all SoftReferences has been cleared at time of OOM.
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65 */
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66 void softReferencesOom(long minSize, long maxSize, int semiRefAllocFrequency) {
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67 System.out.format( "minSize = %d, maxSize = %d, freq = %d%n", minSize, maxSize, semiRefAllocFrequency );
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68 long counter = 0;
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69
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70 long multiplier = maxSize - minSize;
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71 LinkedList<SoftReference> arrSoftRefs = new LinkedList();
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72 LinkedList arrObjects = new LinkedList();
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73 long numberOfNotNulledObjects = 0;
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74 long oomSoftArraySize = 0;
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75
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76 try {
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77 while (true) {
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78 // Keep every Xth object to make sure we hit OOM pretty fast
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79 if (counter % semiRefAllocFrequency != 0) {
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80 long allocationSize = ((int) (rndGenerator.nextDouble() * multiplier))
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81 + minSize;
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82 arrObjects.add(new byte[(int)allocationSize]);
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83 } else {
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84 arrSoftRefs.add(new SoftReference(new Object()));
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85 }
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86
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87 counter++;
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88 if (counter == Long.MAX_VALUE) {
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89 counter = 0;
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90 }
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91 }
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92 } catch (OutOfMemoryError oome) {
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93 // Clear allocated ballast, so we don't get another OOM.
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94
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95 arrObjects = null;
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96
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97 // Get the number of soft refs first, so we don't trigger
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98 // another OOM.
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99 oomSoftArraySize = arrSoftRefs.size();
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100
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101 for (SoftReference sr : arrSoftRefs) {
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102 Object o = sr.get();
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103
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104 if (o != null) {
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105 numberOfNotNulledObjects++;
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106 }
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107 }
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108
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109 // Make sure we clear all refs before we return failure
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110 arrSoftRefs = null;
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111
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112 if (numberOfNotNulledObjects > 0) {
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113 throw new RuntimeException(numberOfNotNulledObjects + " out of "
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114 + oomSoftArraySize + " SoftReferences was not "
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115 + "null at time of OutOfMemoryError");
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116 }
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117 } finally {
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118 arrSoftRefs = null;
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119 arrObjects = null;
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120 }
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121 }
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122
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123 private static final long getBytesCount(String arg) {
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124 String postfixes = "kMGT";
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125 long mod = 1;
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126
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127 if (arg.trim().length() >= 2) {
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128 mod = postfixes.indexOf(
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129 arg.trim().charAt(arg.length() - 1)
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130 );
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131
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132 if (mod != -1) {
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133 mod = (long) Math.pow(1024, mod+1);
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134 arg = arg.substring(0, arg.length() - 1);
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135 } else {
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136 mod = 1; // 10^0
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137 }
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138 }
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139
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140 return Long.parseLong(arg) * mod;
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141 }
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142
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143 private static final long DEFAULT_MIN_SIZE = 512;
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144 private static final long DEFAULT_MAX_SIZE = 1024;
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145 private static final int DEFAULT_FREQUENCY = 4;
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146 }
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