1 /*
 2  * Copyright (c) 2023, Oracle and/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.foreign;
24 
25 import java.lang.foreign.Arena;
26 import java.lang.foreign.MemorySegment;
27 
28 import org.openjdk.jmh.annotations.Benchmark;
29 import org.openjdk.jmh.annotations.BenchmarkMode;
30 import org.openjdk.jmh.annotations.Fork;
31 import org.openjdk.jmh.annotations.Measurement;
32 import org.openjdk.jmh.annotations.Mode;
33 import org.openjdk.jmh.annotations.OutputTimeUnit;
34 import org.openjdk.jmh.annotations.Setup;
35 import org.openjdk.jmh.annotations.State;
36 import org.openjdk.jmh.annotations.Warmup;
37 import sun.misc.Unsafe;
38 
39 import java.util.concurrent.TimeUnit;
40 
41 import static java.lang.foreign.ValueLayout.*;
42 
43 @BenchmarkMode(Mode.AverageTime)
44 @Warmup(iterations = 5, time = 500, timeUnit = TimeUnit.MILLISECONDS)
45 @Measurement(iterations = 10, time = 500, timeUnit = TimeUnit.MILLISECONDS)
46 @State(org.openjdk.jmh.annotations.Scope.Thread)
47 @OutputTimeUnit(TimeUnit.NANOSECONDS)
48 @Fork(value = 3, jvmArgsAppend = {"--enable-native-access=ALL-UNNAMED"})
49 public class MemorySegmentCopyUnsafe {
50 
51     static final Unsafe UNSAFE = Utils.unsafe;
52 
53     long src;
54     long dst;
55 
56     @Setup
57     public void setup() throws Throwable {
58         src = Arena.global().allocate(JAVA_INT).address();
59         dst = Arena.global().allocate(JAVA_INT).address();
60     }
61 
62     @Benchmark
63     public void panama() {
64         MemorySegment srcSeg = MemorySegment.ofAddress(src).reinterpret(JAVA_INT.byteSize());
65         MemorySegment dstSeg = MemorySegment.ofAddress(dst).reinterpret(JAVA_INT.byteSize());
66         dstSeg.copyFrom(srcSeg);
67     }
68 
69     @Benchmark
70     public void unsafe() {
71         UNSAFE.copyMemory(src, dst, JAVA_INT.byteSize());
72     }
73 }