| /* |
| * Copyright (c) 2004, 2018, 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. |
| */ |
| |
| package gc.gctests.WeakReference; |
| |
| import java.util.Random; |
| import java.util.ArrayList; |
| import java.lang.ref.WeakReference; |
| import nsk.share.TestFailure; |
| import nsk.share.gc.GC; |
| import nsk.share.gc.GCTestBase; |
| |
| /** |
| * Original description from JRockit test: |
| * Tests for the WeakReference handling in JRockit (in a more evil way :)). |
| * |
| * This test must be run with a mx value set, as well as with |
| * -XXfullsystemgc, to ensure Runtime.maxMemory() doesn't return 0 |
| * and that System.gc() gets run when called from Java. |
| */ |
| public class WeakReferenceEvilTest extends GCTestBase { |
| |
| /** |
| * Test the WeakReference handling in a more evil way. In this test, |
| * it will only keep every Xth object, thus causing more fragmentation |
| * and fill the heap with unused objects. This test should not |
| * throw any OOME during the test execution. |
| * |
| * @return success if all WeakReferences are NULL after |
| * the test has run |
| */ |
| public void run() { |
| long seed; |
| int minSize; |
| int maxSize; |
| int keepEveryXthObject; |
| double memPercentToFill; |
| long counter = 0; |
| long totalMemAlloced = 0; |
| long memToAlloc = 0; |
| Runtime r = Runtime.getRuntime(); |
| |
| seed = runParams.getSeed(); |
| minSize = 2048; |
| maxSize = 32768; |
| memPercentToFill = 0.45; |
| keepEveryXthObject = 5; |
| |
| memToAlloc = (long) (r.maxMemory() * memPercentToFill); |
| |
| Random rndGenerator = new Random(seed); |
| long multiplier = maxSize - minSize; |
| ArrayList arrWeakRefs = new ArrayList(); |
| |
| try { |
| while (totalMemAlloced < memToAlloc) { |
| int allocationSize = ((int) (rndGenerator.nextDouble() |
| * multiplier)) + minSize; |
| byte[] tmp = new byte[allocationSize]; |
| |
| if (counter % keepEveryXthObject == 0) { |
| arrWeakRefs.add(new WeakReference(tmp)); |
| totalMemAlloced += allocationSize; |
| } |
| |
| // Make sure the temporary object is dereferenced |
| tmp = null; |
| |
| counter++; |
| if (counter == Long.MAX_VALUE) { |
| counter = 0; |
| } |
| } |
| |
| System.gc(); |
| |
| long numberOfNotNulledObjects = 0; |
| |
| for (int i = 0; i < arrWeakRefs.size(); i++) { |
| WeakReference wr = (WeakReference) arrWeakRefs.get(i); |
| Object o = wr.get(); |
| |
| if (o != null) { |
| numberOfNotNulledObjects++; |
| } |
| } |
| |
| if (numberOfNotNulledObjects > 0) { |
| throw new TestFailure(numberOfNotNulledObjects + " out of " |
| + arrWeakRefs.size() + " WeakReferences was not " |
| + "null after the GC had run"); |
| } |
| |
| log.info("All WeakReferences was cleared after the " |
| + "GC had run"); |
| } catch (OutOfMemoryError oome) { |
| throw new TestFailure("OutOfMemoryException was thrown. This should " |
| + "not happen during the execution of this test."); |
| } finally { |
| arrWeakRefs = null; |
| } |
| } |
| public static void main(String[] args) { |
| GC.runTest(new WeakReferenceEvilTest(), args); |
| } |
| } |