Mercurial > hg > graal-jvmci-8
diff test/gc/TestSoftReferencesBehaviorOnOOME.java @ 23637:e97c45c377eb jdk8u75-b09
8059661: Test SoftReference and OOM behavior
Reviewed-by: coffeys
Contributed-by: Alexander Vorobyev <alexander.vorobyev@oracle.com>
author | kshefov |
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date | Fri, 12 Feb 2016 18:15:57 +0300 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/test/gc/TestSoftReferencesBehaviorOnOOME.java Fri Feb 12 18:15:57 2016 +0300 @@ -0,0 +1,146 @@ +/* + * Copyright (c) 2014 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 /testlibrary + * @build TestSoftReferencesBehaviorOnOOME + * @run main/othervm -Xmx128m TestSoftReferencesBehaviorOnOOME 512 2k + * @run main/othervm -Xmx128m TestSoftReferencesBehaviorOnOOME 128k 256k + * @run main/othervm -Xmx128m TestSoftReferencesBehaviorOnOOME 2k 32k 10 + */ +import java.util.*; +import com.oracle.java.testlibrary.Utils; +import java.lang.ref.SoftReference; +import java.util.LinkedList; + +public class TestSoftReferencesBehaviorOnOOME { + + private static final Random rndGenerator = new Random(); + + public static void main(String[] args) { + int semiRefAllocFrequency = DEFAULT_FREQUENCY; + long minSize = DEFAULT_MIN_SIZE, + maxSize = DEFAULT_MAX_SIZE; + + if ( args.length >= 3 ) { + semiRefAllocFrequency = Integer.parseInt(args[2]); + } + + if ( args.length >= 2) { + maxSize = getBytesCount(args[1]); + } + + if ( args.length >= 1) { + minSize = getBytesCount(args[0]); + } + + new TestSoftReferencesBehaviorOnOOME().softReferencesOom(minSize, maxSize, semiRefAllocFrequency); + } + + /** + * Test that all SoftReferences has been cleared at time of OOM. + */ + void softReferencesOom(long minSize, long maxSize, int semiRefAllocFrequency) { + System.out.format( "minSize = %d, maxSize = %d, freq = %d%n", minSize, maxSize, semiRefAllocFrequency ); + long counter = 0; + + long multiplier = maxSize - minSize; + LinkedList<SoftReference> arrSoftRefs = new LinkedList(); + LinkedList arrObjects = new LinkedList(); + long numberOfNotNulledObjects = 0; + long oomSoftArraySize = 0; + + try { + while (true) { + // Keep every Xth object to make sure we hit OOM pretty fast + if (counter % semiRefAllocFrequency != 0) { + long allocationSize = ((int) (rndGenerator.nextDouble() * multiplier)) + + minSize; + arrObjects.add(new byte[(int)allocationSize]); + } else { + arrSoftRefs.add(new SoftReference(new Object())); + } + + counter++; + if (counter == Long.MAX_VALUE) { + counter = 0; + } + } + } catch (OutOfMemoryError oome) { + // Clear allocated ballast, so we don't get another OOM. + + arrObjects = null; + + // Get the number of soft refs first, so we don't trigger + // another OOM. + 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; + + if (numberOfNotNulledObjects > 0) { + throw new RuntimeException(numberOfNotNulledObjects + " out of " + + oomSoftArraySize + " SoftReferences was not " + + "null at time of OutOfMemoryError"); + } + } finally { + arrSoftRefs = null; + arrObjects = null; + } + } + + 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 long DEFAULT_MIN_SIZE = 512; + private static final long DEFAULT_MAX_SIZE = 1024; + private static final int DEFAULT_FREQUENCY = 4; +}