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  */
24 
25 package org.openjdk.bench.vm.gc.barriers.writes;
26 
27 import org.openjdk.jmh.annotations.*;
28 import org.openjdk.jmh.infra.Blackhole;
29 
30 import java.util.concurrent.TimeUnit;
31 
32 @Warmup(iterations = 3, time = 1, timeUnit = TimeUnit.SECONDS)
33 @Measurement(iterations = 3, time = 1, timeUnit = TimeUnit.SECONDS)
34 @Fork(3)
35 @BenchmarkMode(Mode.AverageTime)
36 @OutputTimeUnit(TimeUnit.NANOSECONDS)
37 @State(Scope.Thread)
38 public class MultipleRefFields {
39 
40     static final Object VAL = new Object();
41 
42     Target src;
43 
44     @Setup
45     public void setup() {
46         src = new Target();
47     }
48 
49     @Benchmark
50     @CompilerControl(CompilerControl.Mode.DONT_INLINE)
51     public void test_local() {
52         Target s = src;
53         s.x1 = VAL;
54         s.x2 = VAL;
55         s.x3 = VAL;
56         s.x4 = VAL;
57     }
58 
59     @Benchmark
60     @CompilerControl(CompilerControl.Mode.DONT_INLINE)
61     public void test_field() {
62         src.x1 = VAL;
63         src.x2 = VAL;
64         src.x3 = VAL;
65         src.x4 = VAL;
66     }
67 
68     static class Target {
69         Object x1;
70         Object x2;
71         Object x3;
72         Object x4;
73     }
74 
75 }