1 /*
2  * Copyright (c) 2002, 2018, Oracle and/or its affiliates. All rights reserved.
3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4  *
5  * This code is free software; you can redistribute it and/or modify it
6  * under the terms of the GNU General Public License version 2 only, as
7  * published by the Free Software Foundation.
8  *
9  * This code is distributed in the hope that it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12  * version 2 for more details (a copy is included in the LICENSE file that
13  * accompanied this code).
14  *
15  * You should have received a copy of the GNU General Public License version
16  * 2 along with this work; if not, write to the Free Software Foundation,
17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18  *
19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20  * or visit www.oracle.com if you need additional information or have any
21  * questions.
22  */
23 
24 
25 /*
26  * @test
27  * @key stress gc
28  *
29  * @summary converted from VM Testbase gc/memory/Churn/Churn1.
30  * VM Testbase keywords: [gc, stress, stressopt, nonconcurrent]
31  *
32  * @library /vmTestbase
33  *          /test/lib
34  * @run driver jdk.test.lib.FileInstaller . .
35  * @run main/othervm gc.memory.Churn.Churn1.Churn1
36  */
37 
38 package gc.memory.Churn.Churn1;
39 
40 import nsk.share.test.*;
41 import nsk.share.gc.*;
42 
43 /**
44  *  Test that GC works with memory that is churn over.
45  *
46  *  This test starts a number of threads that create objects,
47  *  keep references to them in array and overwrite them. The test
48  *  test checks that GC is able to collect these objects.
49  *
50  *  This test will adjust the size of allocated objects to run
51  *  environment.
52  *
53  *  @see nsk.share.gc.RunParams#getTestMemory()
54  */
55 public class Churn1 extends ThreadedGCTest {
56         private int multiplier = 10;
57         private int sizeOfArray;
58 
59         class ThreadObject implements Runnable {
60                 private AllMemoryObject objectArray[] = new AllMemoryObject[sizeOfArray];
61 
ThreadObject()62                 public ThreadObject() {
63                         for (int i = 0; i < sizeOfArray; i ++)
64                                 objectArray[i] = new AllMemoryObject(multiplier * i);
65                 }
66 
run()67                 public void run() {
68                         int index = LocalRandom.nextInt(sizeOfArray);
69                         objectArray[index] = new AllMemoryObject(multiplier * index);
70                 }
71         }
72 
createRunnable(int i)73         protected Runnable createRunnable(int i) {
74                 return new ThreadObject();
75         }
run()76         public void run() {
77                 sizeOfArray = (int) Math.min(Math.sqrt(runParams.getTestMemory() * 2 / runParams.getNumberOfThreads() / multiplier), Integer.MAX_VALUE);
78                 super.run();
79         }
80 
main(String args[])81         public static void main(String args[]) {
82                 GC.runTest(new Churn1(), args);
83         }
84 }
85