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 
25 /*
26  * @test
27  * @summary Test that reference processing works with both parallel and non-parallel variants.
28  * @requires vm.gc.Shenandoah
29  *
30  * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -Xms1g                              TestParallelRefprocSanity
31  * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -Xms1g  -XX:-ParallelRefProcEnabled TestParallelRefprocSanity
32  * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -Xms1g  -XX:+ParallelRefProcEnabled TestParallelRefprocSanity
33  */
34 
35 import java.lang.ref.*;
36 
37 public class TestParallelRefprocSanity {
38 
39     static final long TARGET_MB = Long.getLong("target", 10_000); // 10 Gb allocation
40 
41     static volatile Object sink;
42 
43     public static void main(String[] args) throws Exception {
44         long count = TARGET_MB * 1024 * 1024 / 32;
45         for (long c = 0; c < count; c++) {
46             sink = new WeakReference<Object>(new Object());
47         }
48     }
49 
50 }