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 * @test TestSoftReference 25 * @key gc 26 * @summary Tests that all SoftReferences has been cleared at time of OOM. 27 * @library /testlibrary 28 * @build TestSoftReference 29 * @run main/othervm -Xmx200m TestSoftReference 512 2k 30 * @run main/othervm -Xmx200m TestSoftReference 128k 256k 31 * @run main/othervm -Xmx200m TestSoftReference 2k 32k 10 32 */ 33 import com.oracle.java.testlibrary.Utils; 34 import java.lang.ref.SoftReference; 35 import java.util.LinkedList; 36 import java.util.Random; 37 38 public class TestSoftReference { 39 40 private static final Random rndGenerator = Utils.getRandomInstance(); 41 42 public static void main(String[] args) { 43 int semiRefAllocFrequency = DEFAULT_FREQUENCY; 44 long minSize = DEFAULT_MIN_SIZE, 45 maxSize = DEFAULT_MAX_SIZE; 46 47 if ( args.length >= 3 ) { 48 semiRefAllocFrequency = Integer.parseInt(args[2]); 49 } 50 51 if ( args.length >= 2) { 52 maxSize = getBytesCount(args[1]); 53 } 54 55 if ( args.length >= 1) { 56 minSize = getBytesCount(args[0]); 57 } 58 59 new TestSoftReference().softReferencesOom(minSize, maxSize, semiRefAllocFrequency); 60 } 61 62 /** 63 * Test that all SoftReferences has been cleared at time of OOM. 64 */ 65 void softReferencesOom(long minSize, long maxSize, int semiRefAllocFrequency) { 66 System.out.format( "minSize = %d, maxSize = %d, freq = %d%n", minSize, maxSize, semiRefAllocFrequency ); 67 long counter = 0; 68 69 long multiplier = maxSize - minSize; 70 LinkedList<SoftReference> arrSoftRefs = new LinkedList(); 71 LinkedList arrObjects = new LinkedList(); 72 long numberOfNotNulledObjects = 0; 73 long oomSoftArraySize = 0; 74 75 try { 76 while (true) { 77 // Keep every Xth object to make sure we hit OOM pretty fast 78 if (counter % semiRefAllocFrequency != 0) { 79 long allocationSize = ((int) (rndGenerator.nextDouble() * multiplier)) 80 + minSize; 81 arrObjects.add(new byte[(int)allocationSize]); 82 } else { 83 arrSoftRefs.add(new SoftReference(new Object())); 84 } 85 86 counter++; 87 if (counter == Long.MAX_VALUE) { 88 counter = 0; 89 } 90 } 91 } catch (OutOfMemoryError oome) { 92 // Clear allocated ballast, so we don't get another OOM. 93 94 arrObjects = null; 95 96 // Get the number of soft refs first, so we don't trigger 97 // another OOM. 98 oomSoftArraySize = arrSoftRefs.size(); 99 100 for (SoftReference sr : arrSoftRefs) { 101 Object o = sr.get(); 102 103 if (o != null) { 104 numberOfNotNulledObjects++; 105 } 106 } 107 108 // Make sure we clear all refs before we return failure, since 109 // coconut require some memory to complete, and since we're in 110 // an OOM situation, that could cause trouble. 111 arrSoftRefs = null; 112 113 if (numberOfNotNulledObjects > 0) { 114 throw new RuntimeException(numberOfNotNulledObjects + " out of " 115 + oomSoftArraySize + " SoftReferences was not " 116 + "null at time of OutOfMemoryError"); 117 } 118 } finally { 119 arrSoftRefs = null; 120 arrObjects = null; 121 } 122 } 123 124 private static final long getBytesCount(String arg) { 125 String postfixes = "kMGT"; 126 long mod = 1; 127 128 if (arg.trim().length() >= 2) { 129 mod = postfixes.indexOf( 130 arg.trim().charAt(arg.length() - 1) 131 ); 132 133 if (mod != -1) { 134 mod = (long) Math.pow(1024, mod+1); 135 arg = arg.substring(0, arg.length() - 1); 136 } else { 137 mod = 1; // 10^0 138 } 139 } 140 141 return Long.parseLong(arg) * mod; 142 } 143 144 private static final long DEFAULT_MIN_SIZE = 512; 145 private static final long DEFAULT_MAX_SIZE = 1024; 146 private static final int DEFAULT_FREQUENCY = 4; 147 }