1 /*
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 3  *  DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 5  *  This code is free software; you can redistribute it and/or modify it
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 7  *  published by the Free Software Foundation.  Oracle designates this
 8  *  particular file as subject to the "Classpath" exception as provided
 9  *  by Oracle in the LICENSE file that accompanied this code.
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13  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14  *  version 2 for more details (a copy is included in the LICENSE file that
15  *  accompanied this code).
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26 
27 package org.openjdk.bench.jdk.incubator.foreign;
28 
29 import org.openjdk.jmh.annotations.Benchmark;
30 import org.openjdk.jmh.annotations.BenchmarkMode;
31 import org.openjdk.jmh.annotations.Fork;
32 import org.openjdk.jmh.annotations.Measurement;
33 import org.openjdk.jmh.annotations.Mode;
34 import org.openjdk.jmh.annotations.OutputTimeUnit;
35 import org.openjdk.jmh.annotations.State;
36 import org.openjdk.jmh.annotations.Warmup;
37 import sun.misc.Unsafe;
38 
39 import jdk.incubator.foreign.MemorySegment;
40 import java.util.concurrent.TimeUnit;
41 
42 import static jdk.incubator.foreign.MemoryLayouts.JAVA_INT;
43 
44 @BenchmarkMode(Mode.AverageTime)
45 @Warmup(iterations = 5, time = 500, timeUnit = TimeUnit.MILLISECONDS)
46 @Measurement(iterations = 10, time = 500, timeUnit = TimeUnit.MILLISECONDS)
47 @State(org.openjdk.jmh.annotations.Scope.Thread)
48 @OutputTimeUnit(TimeUnit.MILLISECONDS)
49 @Fork(3)
50 public class BulkOps {
51 
52     static final Unsafe unsafe = Utils.unsafe;
53 
54     static final int ELEM_SIZE = 1_000_000;
55     static final int CARRIER_SIZE = (int)JAVA_INT.byteSize();
56     static final int ALLOC_SIZE = ELEM_SIZE * CARRIER_SIZE;
57 
58     static final long unsafe_addr = unsafe.allocateMemory(ALLOC_SIZE);
59     static final MemorySegment segment = MemorySegment.allocateNative(ALLOC_SIZE);
60 
61     static final int[] bytes = new int[ELEM_SIZE];
62     static final MemorySegment bytesSegment = MemorySegment.ofArray(bytes);
63     static final int UNSAFE_INT_OFFSET = unsafe.arrayBaseOffset(int[].class);
64 
65     static {
66         for (int i = 0 ; i < bytes.length ; i++) {
67             bytes[i] = i;
68         }
69     }
70 
71     @Benchmark
72     @OutputTimeUnit(TimeUnit.NANOSECONDS)
73     public void unsafe_fill() {
74         unsafe.setMemory(unsafe_addr, ALLOC_SIZE, (byte)0);
75     }
76 
77     @Benchmark
78     @OutputTimeUnit(TimeUnit.NANOSECONDS)
79     public void segment_fill() {
80         segment.fill((byte)0);
81     }
82 
83     @Benchmark
84     @OutputTimeUnit(TimeUnit.NANOSECONDS)
85     public void unsafe_copy() {
86         unsafe.copyMemory(bytes, UNSAFE_INT_OFFSET, null, unsafe_addr, ALLOC_SIZE);
87     }
88 
89     @Benchmark
90     @OutputTimeUnit(TimeUnit.NANOSECONDS)
91     public void segment_copy() {
92         segment.copyFrom(bytesSegment);
93     }
94 }