Mercurial > hg > graal-jvmci-8
view test/gc/TestSoftReferencesBehaviorOnOOME.java @ 23891:34429bad9986 jdk8u101-b02
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author | asaha |
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date | Mon, 04 Apr 2016 12:18:28 -0700 |
parents | e97c45c377eb |
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/* * 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; }