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/*
* Copyright (c) 2002, 2020, 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
* @key stress randomness
*
* @summary converted from VM Testbase gc/memory/Churn/Churn1.
* VM Testbase keywords: [gc, stress, stressopt, nonconcurrent]
*
* @library /vmTestbase
* /test/lib
* @run main/othervm gc.memory.Churn.Churn1.Churn1
*/
package gc.memory.Churn.Churn1;
import nsk.share.test.*;
import nsk.share.gc.*;
/**
* Test that GC works with memory that is churn over.
*
* This test starts a number of threads that create objects,
* keep references to them in array and overwrite them. The test
* test checks that GC is able to collect these objects.
*
* This test will adjust the size of allocated objects to run
* environment.
*
* @see nsk.share.gc.RunParams#getTestMemory()
*/
public class Churn1 extends ThreadedGCTest {
private int multiplier = 10;
private int sizeOfArray;
class ThreadObject implements Runnable {
private AllMemoryObject objectArray[] = new AllMemoryObject[sizeOfArray];
public ThreadObject() {
for (int i = 0; i < sizeOfArray; i ++)
objectArray[i] = new AllMemoryObject(multiplier * i);
}
public void run() {
int index = LocalRandom.nextInt(sizeOfArray);
objectArray[index] = new AllMemoryObject(multiplier * index);
}
}
protected Runnable createRunnable(int i) {
return new ThreadObject();
}
public void run() {
sizeOfArray = (int) Math.min(Math.sqrt(runParams.getTestMemory() * 2 / runParams.getNumberOfThreads() / multiplier), Integer.MAX_VALUE);
super.run();
}
public static void main(String args[]) {
GC.runTest(new Churn1(), args);
}
}
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