1 /*
 2  * Copyright (c) 2020, 2022, 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.TearDown;
37 import org.openjdk.jmh.annotations.Warmup;
38 
39 import java.util.concurrent.TimeUnit;
40 
41 @BenchmarkMode(Mode.AverageTime)
42 @Warmup(iterations = 5, time = 500, timeUnit = TimeUnit.MILLISECONDS)
43 @Measurement(iterations = 10, time = 500, timeUnit = TimeUnit.MILLISECONDS)
44 @State(org.openjdk.jmh.annotations.Scope.Thread)
45 @OutputTimeUnit(TimeUnit.MILLISECONDS)
46 @Fork(value = 3, jvmArgsAppend = "--enable-preview")
47 public class LoopOverOfAddress extends JavaLayouts {
48 
49     static final int ITERATIONS = 1_000_000;
50 
51     @Benchmark
52     public long segment_loop_addr() {
53         long res = 0;
54         for (int i = 0; i < ITERATIONS; i++) {
55             res += MemorySegment.ofAddress(i % 100).address();
56         }
57         return res;
58     }
59 
60     @Benchmark
61     public long segment_loop_addr_size() {
62         long res = 0;
63         for (int i = 0; i < ITERATIONS; i++) {
64             res += MemorySegment.ofAddress(i)
65                     .reinterpret(i % 100).address();
66         }
67         return res;
68     }
69 
70     @Benchmark
71     public long segment_loop_addr_size_session() {
72         long res = 0;
73         for (int i = 0; i < ITERATIONS; i++) {
74             res += MemorySegment.ofAddress(i)
75                     .reinterpret(i % 100, Arena.global(), null).address();
76         }
77         return res;
78     }
79 }