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146 lines
5.0 KiB
146 lines
5.0 KiB
/* |
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* Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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/** |
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* @test TestSoftReferencesBehaviorOnOOME |
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* @key gc |
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* @summary Tests that all SoftReferences has been cleared at time of OOM. |
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* @library /testlibrary |
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* @build TestSoftReferencesBehaviorOnOOME |
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* @run main/othervm -Xmx128m TestSoftReferencesBehaviorOnOOME 512 2k |
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* @run main/othervm -Xmx128m TestSoftReferencesBehaviorOnOOME 128k 256k |
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* @run main/othervm -Xmx128m TestSoftReferencesBehaviorOnOOME 2k 32k 10 |
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*/ |
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import java.util.*; |
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import com.oracle.java.testlibrary.Utils; |
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import java.lang.ref.SoftReference; |
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import java.util.LinkedList; |
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public class TestSoftReferencesBehaviorOnOOME { |
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private static final Random rndGenerator = new Random(); |
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public static void main(String[] args) { |
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int semiRefAllocFrequency = DEFAULT_FREQUENCY; |
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long minSize = DEFAULT_MIN_SIZE, |
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maxSize = DEFAULT_MAX_SIZE; |
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if ( args.length >= 3 ) { |
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semiRefAllocFrequency = Integer.parseInt(args[2]); |
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} |
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if ( args.length >= 2) { |
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maxSize = getBytesCount(args[1]); |
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} |
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if ( args.length >= 1) { |
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minSize = getBytesCount(args[0]); |
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} |
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new TestSoftReferencesBehaviorOnOOME().softReferencesOom(minSize, maxSize, semiRefAllocFrequency); |
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} |
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/** |
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* Test that all SoftReferences has been cleared at time of OOM. |
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*/ |
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void softReferencesOom(long minSize, long maxSize, int semiRefAllocFrequency) { |
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System.out.format( "minSize = %d, maxSize = %d, freq = %d%n", minSize, maxSize, semiRefAllocFrequency ); |
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long counter = 0; |
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long multiplier = maxSize - minSize; |
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LinkedList<SoftReference> arrSoftRefs = new LinkedList(); |
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LinkedList arrObjects = new LinkedList(); |
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long numberOfNotNulledObjects = 0; |
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long oomSoftArraySize = 0; |
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try { |
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while (true) { |
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// Keep every Xth object to make sure we hit OOM pretty fast |
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if (counter % semiRefAllocFrequency != 0) { |
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long allocationSize = ((int) (rndGenerator.nextDouble() * multiplier)) |
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+ minSize; |
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arrObjects.add(new byte[(int)allocationSize]); |
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} else { |
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arrSoftRefs.add(new SoftReference(new Object())); |
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} |
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counter++; |
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if (counter == Long.MAX_VALUE) { |
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counter = 0; |
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} |
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} |
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} catch (OutOfMemoryError oome) { |
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// Clear allocated ballast, so we don't get another OOM. |
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arrObjects = null; |
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// Get the number of soft refs first, so we don't trigger |
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// another OOM. |
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oomSoftArraySize = arrSoftRefs.size(); |
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for (SoftReference sr : arrSoftRefs) { |
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Object o = sr.get(); |
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if (o != null) { |
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numberOfNotNulledObjects++; |
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} |
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} |
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// Make sure we clear all refs before we return failure |
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arrSoftRefs = null; |
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if (numberOfNotNulledObjects > 0) { |
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throw new RuntimeException(numberOfNotNulledObjects + " out of " |
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+ oomSoftArraySize + " SoftReferences was not " |
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+ "null at time of OutOfMemoryError"); |
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} |
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} finally { |
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arrSoftRefs = null; |
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arrObjects = null; |
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} |
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} |
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private static final long getBytesCount(String arg) { |
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String postfixes = "kMGT"; |
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long mod = 1; |
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if (arg.trim().length() >= 2) { |
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mod = postfixes.indexOf( |
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arg.trim().charAt(arg.length() - 1) |
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); |
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if (mod != -1) { |
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mod = (long) Math.pow(1024, mod+1); |
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arg = arg.substring(0, arg.length() - 1); |
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} else { |
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mod = 1; // 10^0 |
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} |
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} |
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return Long.parseLong(arg) * mod; |
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} |
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private static final long DEFAULT_MIN_SIZE = 512; |
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private static final long DEFAULT_MAX_SIZE = 1024; |
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private static final int DEFAULT_FREQUENCY = 4; |
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}
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