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.ref; 24 25 import org.openjdk.bench.java.util.stream.ops.LongAccumulator; 26 import org.openjdk.jmh.annotations.Benchmark; 27 import org.openjdk.jmh.annotations.BenchmarkMode; 28 import org.openjdk.jmh.annotations.Mode; 29 import org.openjdk.jmh.annotations.OutputTimeUnit; 30 import org.openjdk.jmh.annotations.Param; 31 import org.openjdk.jmh.annotations.Scope; 32 import org.openjdk.jmh.annotations.Setup; 33 import org.openjdk.jmh.annotations.State; 34 35 import java.util.Comparator; 36 import java.util.concurrent.TimeUnit; 37 import java.util.stream.LongStream; 38 39 /** 40 * Benchmark for sorted() operation. 41 */ 42 @BenchmarkMode(Mode.Throughput) 43 @OutputTimeUnit(TimeUnit.SECONDS) 44 @State(Scope.Thread) 45 public class Sorted { 46 47 /** 48 * Implementation notes: 49 * - parallel version requires thread-safe sink, we use the same for sequential version for better comparison 50 * - operations are explicit inner classes to untangle unwanted lambda effects 51 * - consecutive sorts should reuse the knowledge that stream was sorted already 52 */ 53 54 @Param("100000") 55 private int size; 56 57 private Comparator<Long> cmp; 58 59 @Setup 60 public void setup() { 61 cmp = new Comparator<Long>() { 62 @Override 63 public int compare(Long x, Long y) { 64 return (x > y) ? 1 : (x < y ? -1 : 0); 65 } 66 }; 67 } 68 69 @Benchmark 70 public long seq_invoke() { 71 return LongStream.range(0, size) 72 .boxed() 73 .sorted(cmp) 74 .collect(LongAccumulator::new, LongAccumulator::add, LongAccumulator::merge).get(); 75 } 76 77 @Benchmark 78 public long par_invoke() { 79 return LongStream.range(0, size).parallel() 80 .boxed() 81 .sorted(cmp) 82 .collect(LongAccumulator::new, LongAccumulator::add, LongAccumulator::merge).get(); 83 } 84 85 @Benchmark 86 public long seq_chain() { 87 return LongStream.range(0, size) 88 .boxed() 89 .sorted(cmp) 90 .sorted(cmp) 91 .sorted(cmp) 92 .collect(LongAccumulator::new, LongAccumulator::add, LongAccumulator::merge).get(); 93 } 94 95 @Benchmark 96 public long par_chain() { 97 return LongStream.range(0, size).parallel() 98 .boxed() 99 .sorted(cmp) 100 .sorted(cmp) 101 .sorted(cmp) 102 .collect(LongAccumulator::new, LongAccumulator::add, LongAccumulator::merge).get(); 103 } 104 105 }