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/*
* Copyright (c) 2002, 2023, 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.
*/
/*
* summary converted from VM Testbase gc/memory/Array/ArrayJuggle/Juggle1.
* VM Testbase keywords: [gc, stress, stressopt, nonconcurrent]
*/
/* @test @key stress randomness @library /vmTestbase /test/lib @run main/othervm -Xlog:gc=debug:gc.log gc.ArrayJuggle.Juggle1 */
/* @test @key stress randomness @library /vmTestbase /test/lib @run main/othervm -Xlog:gc=debug:gc.log gc.ArrayJuggle.Juggle1 -tg */
package gc.ArrayJuggle;
import nsk.share.test.*;
import nsk.share.gc.*;
/**
* Test that tries to confuse the GC.
*
* This program initializes a main array and launches some threads
* which modify and copy portions of the array to try to confuse
* the GC.
*/
public class Juggle1 extends ThreadedGCTest {
private int arraySize = 1000;
private int objectSize = 1000;
private int maxLinkLength = 100;
private int maxCopySize = arraySize / 10;
private int threadsCount;
private LinkedMemoryObject mainArray[];
private class MainArrayWalker implements Runnable {
public void run() {
int index = LocalRandom.nextInt(arraySize);
int cellSize = LocalRandom.nextInt(objectSize);
mainArray[index] = new LinkedMemoryObject(cellSize);
//mainArray[index] = Memory.makeLinearList(maxLinkLength, objectSize);
}
public String toString() {
return "Thread-A";
}
}
private class LinkMaker implements Runnable {
private int n;
public void run() {
int index = LocalRandom.nextInt(arraySize);
// Sometimes clear the reference so the lists do not become too large
if (++n == maxLinkLength) {
mainArray[index] = null;
n = 0;
}
mainArray[index] = Memory.makeRandomLinearList(maxLinkLength, objectSize);
}
public String toString() {
return "Thread-B";
}
}
private class CopyingThread implements Runnable {
private LinkedMemoryObject localArray[];
private int currentIndex = 0;
public CopyingThread() {
localArray = new LinkedMemoryObject[maxCopySize];
}
public void run() {
int toCopy = LocalRandom.nextInt(maxCopySize);
int mainIndex = LocalRandom.nextInt(arraySize);
for (int i = 0; i < toCopy; i++) {
localArray[currentIndex] = mainArray[mainIndex];
currentIndex = (currentIndex + 1) % maxCopySize;
mainIndex = (mainIndex + 1) % arraySize;
}
}
public String toString() {
return "Thread-C";
}
}
protected Runnable createRunnable(int i) {
switch (i % 3) {
case 0:
return new MainArrayWalker();
case 1:
return new LinkMaker();
case 2:
default:
return new CopyingThread();
}
}
public void run() {
// arraySize * (objectSize + referenceSize) + threadsCount * (referenceSize arraySize/10 * (referenceSize + objectSize)) = memory
long referenceSize = Memory.getReferenceSize();
long objectExtraSize = Memory.getObjectExtraSize();
threadsCount = runParams.getNumberOfThreads();
arraySize = Memory.getArrayLength(
runParams.getTestMemory(),
Memory.getListSize(maxLinkLength, objectSize)
);
maxCopySize = arraySize / 10 - 1;
arraySize = arraySize * 9 / 10 - 1;
System.out.println("Array size: " + arraySize);
mainArray = new LinkedMemoryObject[arraySize];
Memory.fillArrayRandom(mainArray, arraySize, objectSize);
super.run();
}
public static void main(String args[]) {
GC.runTest(new Juggle1(), args);
}
}
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