1 /* 2 * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /** 25 * @test TestSoftReferencesBehaviorOnOOME 26 * @key gc 27 * @summary Tests that all SoftReferences has been cleared at time of OOM. 28 * @library /testlibrary 29 * @modules java.base/sun.misc 30 * java.management 31 * @ignore 8073669 32 * @build TestSoftReferencesBehaviorOnOOME 33 * @run main/othervm -Xmx128m TestSoftReferencesBehaviorOnOOME 512 2k 34 * @run main/othervm -Xmx128m TestSoftReferencesBehaviorOnOOME 128k 256k 35 * @run main/othervm -Xmx128m TestSoftReferencesBehaviorOnOOME 2k 32k 10 36 */ 37 import com.oracle.java.testlibrary.Utils; 38 import java.lang.ref.SoftReference; 39 import java.util.LinkedList; 40 import java.util.Random; 41 42 public class TestSoftReferencesBehaviorOnOOME { 43 44 private static final Random rndGenerator = Utils.getRandomInstance(); 45 46 public static void main(String[] args) { 47 int semiRefAllocFrequency = DEFAULT_FREQUENCY; 48 long minSize = DEFAULT_MIN_SIZE, 49 maxSize = DEFAULT_MAX_SIZE; 50 51 if ( args.length >= 3 ) { 52 semiRefAllocFrequency = Integer.parseInt(args[2]); 53 } 54 55 if ( args.length >= 2) { 56 maxSize = getBytesCount(args[1]); 57 } 58 59 if ( args.length >= 1) { 60 minSize = getBytesCount(args[0]); 61 } 62 63 new TestSoftReferencesBehaviorOnOOME().softReferencesOom(minSize, maxSize, semiRefAllocFrequency); 64 } 65 66 /** 67 * Test that all SoftReferences has been cleared at time of OOM. 68 */ 69 void softReferencesOom(long minSize, long maxSize, int semiRefAllocFrequency) { 70 System.out.format( "minSize = %d, maxSize = %d, freq = %d%n", minSize, maxSize, semiRefAllocFrequency ); 71 long counter = 0; 72 73 long multiplier = maxSize - minSize; 74 LinkedList<SoftReference> arrSoftRefs = new LinkedList(); 75 LinkedList arrObjects = new LinkedList(); 76 long numberOfNotNulledObjects = 0; 77 long oomSoftArraySize = 0; 78 79 try { 80 while (true) { 81 // Keep every Xth object to make sure we hit OOM pretty fast 82 if (counter % semiRefAllocFrequency != 0) { 83 long allocationSize = ((int) (rndGenerator.nextDouble() * multiplier)) 84 + minSize; 85 arrObjects.add(new byte[(int)allocationSize]); 86 } else { 87 arrSoftRefs.add(new SoftReference(new Object())); 88 } 89 90 counter++; 91 if (counter == Long.MAX_VALUE) { 92 counter = 0; 93 } 94 } 95 } catch (OutOfMemoryError oome) { 96 // Clear allocated ballast, so we don't get another OOM. 97 98 arrObjects = null; 99 100 // Get the number of soft refs first, so we don't trigger 101 // another OOM. 102 oomSoftArraySize = arrSoftRefs.size(); 103 104 for (SoftReference sr : arrSoftRefs) { 105 Object o = sr.get(); 106 107 if (o != null) { 108 numberOfNotNulledObjects++; 109 } 110 } 111 112 // Make sure we clear all refs before we return failure 113 arrSoftRefs = null; 114 115 if (numberOfNotNulledObjects > 0) { 116 throw new RuntimeException(numberOfNotNulledObjects + " out of " 117 + oomSoftArraySize + " SoftReferences was not " 118 + "null at time of OutOfMemoryError"); 119 } 120 } finally { 121 arrSoftRefs = null; 122 arrObjects = null; 123 } 124 } 125 126 private static final long getBytesCount(String arg) { 127 String postfixes = "kMGT"; 128 long mod = 1; 129 130 if (arg.trim().length() >= 2) { 131 mod = postfixes.indexOf( 132 arg.trim().charAt(arg.length() - 1) 133 ); 134 135 if (mod != -1) { 136 mod = (long) Math.pow(1024, mod+1); 137 arg = arg.substring(0, arg.length() - 1); 138 } else { 139 mod = 1; // 10^0 140 } 141 } 142 143 return Long.parseLong(arg) * mod; 144 } 145 146 private static final long DEFAULT_MIN_SIZE = 512; 147 private static final long DEFAULT_MAX_SIZE = 1024; 148 private static final int DEFAULT_FREQUENCY = 4; 149 }