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; 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 checking different reduce schemes. 40 */ 41 @BenchmarkMode(Mode.Throughput) 42 @OutputTimeUnit(TimeUnit.SECONDS) 43 @State(Scope.Thread) 44 public class Reducers { 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 * - the result of applying consecutive operations is the same, in order to have the same number of elements in sink 51 */ 52 53 @Param("100000") 54 private int size; 55 56 private LongBinaryOperator op; 57 58 @Setup 59 public void setup() { 60 op = new LongBinaryOperator() { 61 @Override 62 public long applyAsLong(long l, long r) { 63 return (l > r) ? l : r; 64 } 65 }; 66 } 67 68 @Benchmark 69 public long seq_reduce() { 70 return LongStream.range(0, size).reduce(op).getAsLong(); 71 } 72 73 @Benchmark 74 public long par_reduce() { 75 return LongStream.range(0, size).parallel().reduce(op).getAsLong(); 76 } 77 78 @Benchmark 79 public long seq_reduce_base() { 80 return LongStream.range(0, size).reduce(0L, op); 81 } 82 83 @Benchmark 84 public long par_reduce_base() { 85 return LongStream.range(0, size).parallel().reduce(0L, op); 86 } 87 88 89 }