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
26 import org.openjdk.jmh.annotations.Benchmark;
27 import org.openjdk.jmh.annotations.BenchmarkMode;
28 import org.openjdk.jmh.annotations.Fork;
29 import org.openjdk.jmh.annotations.Measurement;
30 import org.openjdk.jmh.annotations.Mode;
31 import org.openjdk.jmh.annotations.OutputTimeUnit;
32 import org.openjdk.jmh.annotations.Setup;
33 import org.openjdk.jmh.annotations.State;
34 import org.openjdk.jmh.annotations.TearDown;
35 import org.openjdk.jmh.annotations.Warmup;
36 import sun.misc.Unsafe;
37
38 import java.nio.ByteBuffer;
39 import java.nio.ByteOrder;
40 import java.nio.FloatBuffer;
41 import java.util.concurrent.TimeUnit;
42
43 import static java.lang.foreign.ValueLayout.JAVA_INT;
44
45 @BenchmarkMode(Mode.AverageTime)
46 @Warmup(iterations = 5, time = 500, timeUnit = TimeUnit.MILLISECONDS)
47 @Measurement(iterations = 10, time = 500, timeUnit = TimeUnit.MILLISECONDS)
48 @State(org.openjdk.jmh.annotations.Scope.Thread)
49 @OutputTimeUnit(TimeUnit.MILLISECONDS)
50 @Fork(3)
51 public class LoopOverPollutedBuffer {
52
53 static final int ELEM_SIZE = 1_000_000;
54 static final int CARRIER_SIZE = (int) JAVA_INT.byteSize();
55 static final int ALLOC_SIZE = ELEM_SIZE * CARRIER_SIZE;
56
57 static final Unsafe unsafe = Utils.unsafe;
58
59 ByteBuffer dbb = ByteBuffer.allocateDirect(ALLOC_SIZE).order(ByteOrder.nativeOrder());
60 byte[] arr = new byte[ALLOC_SIZE];
61 ByteBuffer hbb = ByteBuffer.wrap(arr).order(ByteOrder.nativeOrder());
62 FloatBuffer hfb = hbb.asFloatBuffer();
63
64
65 @Setup
66 public void setup() {
67 for (int i = 0; i < ELEM_SIZE; i++) {
68 dbb.putFloat(i * 4, i);
69 hbb.putFloat(i * 4, i);
70 }
71 for (int i = 0; i < ELEM_SIZE; i++) {
72 hfb.put(i, i);
73 }
74 }
75
76 @TearDown
77 public void tearDown() {
78 unsafe.invokeCleaner(dbb);
79 arr = null;
80 hbb = null;
81 hfb = null;
82 }
83
84 @Benchmark
85 public int direct_byte_buffer_get_float() {
86 int sum = 0;
87 for (int k = 0; k < ELEM_SIZE; k++) {
88 dbb.putFloat(k, (float)k + 1);
89 float v = dbb.getFloat(k * 4);
90 sum += (int)v;
91 }
92 return sum;
93 }
94
95 @Benchmark
96 public int heap_byte_buffer_get_int() {
97 int sum = 0;
98 for (int k = 0; k < ELEM_SIZE; k++) {
99 hbb.putInt(k, k + 1);
100 int v = hbb.getInt(k * 4);
101 sum += v;
102 }
103 return sum;
104 }
105
106 @Benchmark
107 public int unsafe_get_float() {
108 int sum = 0;
109 for (int k = 0; k < ALLOC_SIZE; k += 4) {
110 unsafe.putFloat(arr, k + Unsafe.ARRAY_BYTE_BASE_OFFSET, k + 1);
111 float v = unsafe.getFloat(arr, k + Unsafe.ARRAY_BYTE_BASE_OFFSET);
112 sum += (int)v;
113 }
114 return sum;
115 }
116 }