1 /* 2 * Copyright (c) 2014 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.util.stream.ops.value; 24 25 import org.openjdk.jmh.annotations.Benchmark; 26 import org.openjdk.jmh.annotations.BenchmarkMode; 27 import org.openjdk.jmh.annotations.Mode; 28 import org.openjdk.jmh.annotations.OutputTimeUnit; 29 import org.openjdk.jmh.annotations.Param; 30 import org.openjdk.jmh.annotations.Scope; 31 import org.openjdk.jmh.annotations.Setup; 32 import org.openjdk.jmh.annotations.State; 33 34 import java.util.concurrent.TimeUnit; 35 import java.util.function.LongBinaryOperator; 36 import java.util.stream.LongStream; 37 38 /** 39 * Benchmark for reduce() operation. 40 */ 41 @BenchmarkMode(Mode.Throughput) 42 @OutputTimeUnit(TimeUnit.SECONDS) 43 @State(Scope.Thread) 44 public class Reduce { 45 46 /** 47 * Implementation notes: 48 * - parallel version requires thread-safe sink, we use the same for sequential version for better comparison 49 * - operations are explicit inner classes to untangle unwanted lambda effects 50 */ 51 @Param("100000") 52 private int size; 53 54 private LongBinaryOperator op1, op2, op3; 55 56 @Setup 57 public void setup() { 58 op1 = new LongBinaryOperator() { 59 @Override 60 public long applyAsLong(long l, long r) { 61 return (l > r) ? l : r; 62 } 63 }; 64 op2 = new LongBinaryOperator() { 65 @Override 66 public long applyAsLong(long l, long r) { 67 return (l > r) ? l : r; 68 } 69 }; 70 op3 = new LongBinaryOperator() { 71 @Override 72 public long applyAsLong(long l, long r) { 73 return (l > r) ? l : r; 74 } 75 }; 76 } 77 78 @Benchmark 79 public long seq_invoke() { 80 return LongStream.range(0, size).reduce(op1).getAsLong(); 81 } 82 83 @Benchmark 84 public long seq_chain_111() { 85 long l = 0; 86 l += LongStream.range(0, size).reduce(op1).getAsLong(); 87 l += LongStream.range(0, size).reduce(op1).getAsLong(); 88 l += LongStream.range(0, size).reduce(op1).getAsLong(); 89 return l; 90 } 91 92 @Benchmark 93 public long seq_chain_123() { 94 long l = 0; 95 l += LongStream.range(0, size).reduce(op1).getAsLong(); 96 l += LongStream.range(0, size).reduce(op2).getAsLong(); 97 l += LongStream.range(0, size).reduce(op3).getAsLong(); 98 return l; 99 } 100 101 @Benchmark 102 public long par_invoke() { 103 return LongStream.range(0, size).parallel().reduce(op1).getAsLong(); 104 } 105 106 @Benchmark 107 public long par_chain_111() { 108 long l = 0; 109 l += LongStream.range(0, size).parallel().reduce(op1).getAsLong(); 110 l += LongStream.range(0, size).parallel().reduce(op1).getAsLong(); 111 l += LongStream.range(0, size).parallel().reduce(op1).getAsLong(); 112 return l; 113 } 114 115 @Benchmark 116 public long par_chain_123() { 117 long l = 0; 118 l += LongStream.range(0, size).parallel().reduce(op1).getAsLong(); 119 l += LongStream.range(0, size).parallel().reduce(op2).getAsLong(); 120 l += LongStream.range(0, size).parallel().reduce(op3).getAsLong(); 121 return l; 122 } 123 124 }