| /* |
| * Copyright (c) 2014, 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /** |
| * @test TestSoftReferencesBehaviorOnOOME |
| * @key gc |
| * @summary Tests that all SoftReferences has been cleared at time of OOM. |
| * @library /test/lib |
| * @modules java.base/jdk.internal.misc |
| * @run main/othervm -Xmx128m TestSoftReferencesBehaviorOnOOME 512 2k |
| * @run main/othervm -Xmx128m TestSoftReferencesBehaviorOnOOME 128k 256k |
| * @run main/othervm -Xmx128m TestSoftReferencesBehaviorOnOOME 2k 32k |
| */ |
| import jdk.test.lib.Utils; |
| import jdk.test.lib.Asserts; |
| import java.lang.ref.SoftReference; |
| import java.util.LinkedList; |
| import java.util.Random; |
| |
| public class TestSoftReferencesBehaviorOnOOME { |
| |
| /** |
| * Test generates a lot of soft references to objects with random payloads. |
| * Then it provokes OOME and checks that all SoftReferences has been gone |
| * @param args - [minSize] [maxSize] [freq] |
| * where |
| * - minSize - min size of random objects |
| * - maxSize - max size of random objects |
| */ |
| public static void main(String[] args) { |
| long minSize = DEFAULT_MIN_SIZE; |
| long maxSize = DEFAULT_MAX_SIZE; |
| |
| if ( args.length >= 2) { |
| maxSize = getBytesCount(args[1]); |
| } |
| |
| if ( args.length >= 1) { |
| minSize = getBytesCount(args[0]); |
| } |
| |
| new TestSoftReferencesBehaviorOnOOME().softReferencesOom(minSize, maxSize); |
| } |
| |
| /** |
| * Test that all SoftReferences has been cleared at time of OOM. |
| */ |
| void softReferencesOom(long minSize, long maxSize) { |
| System.out.format( "minSize = %d, maxSize = %d%n", minSize, maxSize ); |
| |
| LinkedList<SoftReference> arrSoftRefs = new LinkedList(); |
| staticRef = arrSoftRefs; |
| LinkedList arrObjects = new LinkedList(); |
| staticRef = arrObjects; |
| |
| long multiplier = maxSize - minSize; |
| long numberOfNotNulledObjects = 0; |
| |
| try { |
| |
| // Lets allocate as many as we can - taking size of all SoftRerefences |
| // by minimum. So it can provoke some GC but we surely will allocate enough. |
| long numSofts = (long) ((0.95 * Runtime.getRuntime().totalMemory()) / minSize); |
| System.out.println("num Soft: " + numSofts); |
| |
| while (numSofts-- > 0) { |
| int allocationSize = ((int) (RND_GENERATOR.nextDouble() * multiplier)) |
| + (int)minSize; |
| arrSoftRefs.add(new SoftReference(new byte[allocationSize])); |
| } |
| |
| System.out.println("free: " + Runtime.getRuntime().freeMemory()); |
| |
| // provoke OOME. |
| while (true) { |
| arrObjects.add(new byte[(int) Runtime.getRuntime().totalMemory()]); |
| } |
| |
| } catch (OutOfMemoryError oome) { |
| |
| // Clear allocated ballast, so we don't get another OOM. |
| staticRef = null; |
| arrObjects = null; |
| long oomSoftArraySize = arrSoftRefs.size(); |
| |
| for (SoftReference sr : arrSoftRefs) { |
| Object o = sr.get(); |
| |
| if (o != null) { |
| numberOfNotNulledObjects++; |
| } |
| } |
| |
| // Make sure we clear all refs before we return failure |
| arrSoftRefs = null; |
| Asserts.assertFalse(numberOfNotNulledObjects > 0, |
| "" + numberOfNotNulledObjects + " out of " |
| + oomSoftArraySize + " SoftReferences was not " |
| + "null at time of OutOfMemoryError" |
| ); |
| } finally { |
| Asserts.assertTrue(arrObjects == null, "OOME hasn't been provoked"); |
| Asserts.assertTrue(arrSoftRefs == null, "OOME hasn't been provoked"); |
| } |
| } |
| |
| private static final long getBytesCount(String arg) { |
| String postfixes = "kMGT"; |
| long mod = 1; |
| |
| if (arg.trim().length() >= 2) { |
| mod = postfixes.indexOf(arg.trim().charAt(arg.length() - 1)); |
| |
| if (mod != -1) { |
| mod = (long) Math.pow(1024, mod+1); |
| arg = arg.substring(0, arg.length() - 1); |
| } else { |
| mod = 1; // 10^0 |
| } |
| } |
| |
| return Long.parseLong(arg) * mod; |
| } |
| |
| private static final Random RND_GENERATOR = Utils.getRandomInstance(); |
| private static final long DEFAULT_MIN_SIZE = 512; |
| private static final long DEFAULT_MAX_SIZE = 1024; |
| private static Object staticRef; // to prevent compile optimisations |
| } |