1 /* 2 * Copyright (c) 2014, 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 * @build TestSoftReferencesBehaviorOnOOME 30 * @run main/othervm -Xmx128m TestSoftReferencesBehaviorOnOOME 512 2k 31 * @run main/othervm -Xmx128m TestSoftReferencesBehaviorOnOOME 128k 256k 32 * @run main/othervm -Xmx128m TestSoftReferencesBehaviorOnOOME 2k 32k 10 33 */ 34 import java.util.*; 35 import com.oracle.java.testlibrary.Utils; 36 import java.lang.ref.SoftReference; 37 import java.util.LinkedList; 38 39 public class TestSoftReferencesBehaviorOnOOME { 40 41 private static final Random rndGenerator = new Random(); 42 43 public static void main(String[] args) { 44 int semiRefAllocFrequency = DEFAULT_FREQUENCY; 45 long minSize = DEFAULT_MIN_SIZE, 46 maxSize = DEFAULT_MAX_SIZE; 47 48 if ( args.length >= 3 ) { 49 semiRefAllocFrequency = Integer.parseInt(args[2]); 50 } 51 52 if ( args.length >= 2) { 53 maxSize = getBytesCount(args[1]); 54 } 55 56 if ( args.length >= 1) { 57 minSize = getBytesCount(args[0]); 58 } 59 60 new TestSoftReferencesBehaviorOnOOME().softReferencesOom(minSize, maxSize, semiRefAllocFrequency); 61 } 62 63 /** 64 * Test that all SoftReferences has been cleared at time of OOM. 65 */ 66 void softReferencesOom(long minSize, long maxSize, int semiRefAllocFrequency) { 67 System.out.format( "minSize = %d, maxSize = %d, freq = %d%n", minSize, maxSize, semiRefAllocFrequency ); 68 long counter = 0; 69 70 long multiplier = maxSize - minSize; 71 LinkedList<SoftReference> arrSoftRefs = new LinkedList(); 72 LinkedList arrObjects = new LinkedList(); 73 long numberOfNotNulledObjects = 0; 74 long oomSoftArraySize = 0; 75 76 try { 77 while (true) { 78 // Keep every Xth object to make sure we hit OOM pretty fast 79 if (counter % semiRefAllocFrequency != 0) { 80 long allocationSize = ((int) (rndGenerator.nextDouble() * multiplier)) 81 + minSize; 82 arrObjects.add(new byte[(int)allocationSize]); 83 } else { 84 arrSoftRefs.add(new SoftReference(new Object())); 85 } 86 87 counter++; 88 if (counter == Long.MAX_VALUE) { 89 counter = 0; 90 } 91 } 92 } catch (OutOfMemoryError oome) { 93 // Clear allocated ballast, so we don't get another OOM. 94 95 arrObjects = null; 96 97 // Get the number of soft refs first, so we don't trigger 98 // another OOM. 99 oomSoftArraySize = arrSoftRefs.size(); 100 101 for (SoftReference sr : arrSoftRefs) { 102 Object o = sr.get(); 103 104 if (o != null) { 105 numberOfNotNulledObjects++; 106 } 107 } 108 109 // Make sure we clear all refs before we return failure 110 arrSoftRefs = null; 111 112 if (numberOfNotNulledObjects > 0) { 113 throw new RuntimeException(numberOfNotNulledObjects + " out of " 114 + oomSoftArraySize + " SoftReferences was not " 115 + "null at time of OutOfMemoryError"); 116 } 117 } finally { 118 arrSoftRefs = null; 119 arrObjects = null; 120 } 121 } 122 123 private static final long getBytesCount(String arg) { 124 String postfixes = "kMGT"; 125 long mod = 1; 126 127 if (arg.trim().length() >= 2) { 128 mod = postfixes.indexOf( 129 arg.trim().charAt(arg.length() - 1) 130 ); 131 132 if (mod != -1) { 133 mod = (long) Math.pow(1024, mod+1); 134 arg = arg.substring(0, arg.length() - 1); 135 } else { 136 mod = 1; // 10^0 137 } 138 } 139 140 return Long.parseLong(arg) * mod; 141 } 142 143 private static final long DEFAULT_MIN_SIZE = 512; 144 private static final long DEFAULT_MAX_SIZE = 1024; 145 private static final int DEFAULT_FREQUENCY = 4; 146 }