1 /*
 2  * Copyright (c) 2017, 2018, Red Hat, Inc. 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 package gc.epsilon;
25 
26 /**
27  * @test TestSlidingGC
28  * @key randomness
29  * @requires vm.gc.Epsilon & !vm.graal.enabled
30  * @summary Epsilon sliding GC works
31  * @library /test/lib
32  * @run main/othervm -Xmx512m -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC -XX:+EpsilonSlidingGC -XX:+EpsilonVerify                      gc.epsilon.TestSlidingGC
33  * @run main/othervm -Xmx512m -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC -XX:+EpsilonSlidingGC                                         gc.epsilon.TestSlidingGC
34  * @run main/othervm -Xmx512m -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC -XX:+EpsilonSlidingGC -XX:+EpsilonVerify -XX:+EpsilonUncommit gc.epsilon.TestSlidingGC
35  * @run main/othervm -Xmx512m -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC -XX:+EpsilonSlidingGC                    -XX:+EpsilonUncommit gc.epsilon.TestSlidingGC
36  */
37 
38 import java.util.concurrent.*;
39 import java.util.Random;
40 
41 import jdk.test.lib.process.OutputAnalyzer;
42 import jdk.test.lib.process.ProcessTools;
43 import jdk.test.lib.Utils;
44 
45 public class TestSlidingGC {
46 
47   static int SIZE  = Integer.getInteger("size", 10_000_000);
48   static int COUNT = Integer.getInteger("count", 100_000_000); // ~2.4 GB allocation
49 
50   static Object[] sink;
51 
52   public static void main(String... args) {
53     Random r = Utils.getRandomInstance();
54     sink = new Object[SIZE];
55     for (int c = 0; c < COUNT; c++) {
56       sink[r.nextInt(SIZE)] = new Object();
57     }
58   }
59 
60 }