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 id=adaptive
27  * @requires vm.gc.Shenandoah
28  *
29  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
30  *      -XX:+ShenandoahRegionSampling -XX:+ShenandoahRegionSampling
31  *      -XX:+ShenandoahLogRegionSampling -XX:ShenandoahRegionSamplingFile=region-snapshots-%p.log
32  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=adaptive
33  *      TestRegionSamplingLogging
34  */
35 
36 import java.io.File;
37 import java.util.Arrays;
38 
39 public class TestRegionSamplingLogging {
40 
41     static final long TARGET_MB = Long.getLong("target", 2_000); // 2 Gb allocation
42 
43     static volatile Object sink;
44 
45     public static void main(String[] args) throws Exception {
46         long count = TARGET_MB * 1024 * 1024 / 16;
47         for (long c = 0; c < count; c++) {
48             sink = new Object();
49         }
50 
51         File directory = new File(".");
52         File[] files = directory.listFiles((dir, name) -> name.startsWith("region-snapshots") && name.endsWith(".log"));
53         System.out.println(Arrays.toString(files));
54         if (files == null || files.length == 0) {
55             throw new IllegalStateException("Did not find expected snapshot log file.");
56         }
57     }
58 }