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/*
* 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.
* @requires vm.gc != "Z"
* @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
}
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