1 /*
 2  * Copyright Amazon.com Inc. 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 package org.openjdk.bench.java.lang.ref;
24 
25 import java.lang.ref.Cleaner;
26 import java.lang.ref.Cleaner.Cleanable;
27 import java.util.concurrent.ThreadLocalRandom;
28 import java.util.concurrent.TimeUnit;
29 import org.openjdk.jmh.annotations.*;
30 import org.openjdk.jmh.infra.Blackhole;
31 
32 @OutputTimeUnit(TimeUnit.NANOSECONDS)
33 @State(Scope.Thread)
34 @BenchmarkMode(Mode.AverageTime)
35 @Warmup(iterations = 3, time = 1, timeUnit = TimeUnit.SECONDS)
36 @Measurement(iterations = 3, time = 1, timeUnit = TimeUnit.SECONDS)
37 @Fork(value = 3, jvmArgs = {"-Xmx256m", "-Xms256m", "-XX:+AlwaysPreTouch"})
38 public class CleanerChurn {
39 
40     @Param({"128", "256", "512", "1024", "2048"})
41     int recipFreq;
42 
43     @Benchmark
44     public Object test() {
45         boolean register = ThreadLocalRandom.current().nextInt(recipFreq) == 0;
46         return new Target(register);
47     }
48 
49     static class Target {
50         private static final Cleaner CLEANER = Cleaner.create();
51         public Target(boolean register) {
52             if (register) {
53                 CLEANER.register(this, () -> {});
54             }
55         }
56     }
57 
58 }