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.State; 33 34 import java.util.concurrent.TimeUnit; 35 import java.util.stream.LongStream; 36 37 /** 38 * Benchmark for uniqueElements() operation. 39 */ 40 @BenchmarkMode(Mode.Throughput) 41 @OutputTimeUnit(TimeUnit.SECONDS) 42 @State(Scope.Thread) 43 public class UniqueElements { 44 45 /** 46 * Implementation notes: 47 * - parallel version requires thread-safe sink, we use the same for sequential version for better comparison 48 * - operations are explicit inner classes to untangle unwanted lambda effects 49 * - the result of applying consecutive operations is the same, in order to have the same number of elements in sink 50 */ 51 52 @Param("100000") 53 private int size; 54 55 @Benchmark 56 public long seq_invoke() { 57 return LongStream.range(0, size) 58 .boxed() 59 .distinct() 60 .collect(LongAccumulator::new, LongAccumulator::add, LongAccumulator::merge).get(); 61 } 62 63 @Benchmark 64 public long par_invoke() { 65 return LongStream.range(0, size).parallel() 66 .boxed() 67 .distinct() 68 .collect(LongAccumulator::new, LongAccumulator::add, LongAccumulator::merge).get(); 69 } 70 71 @Benchmark 72 public long seq_chain() { 73 return LongStream.range(0, size) 74 .boxed() 75 .distinct() 76 .distinct() 77 .distinct() 78 .collect(LongAccumulator::new, LongAccumulator::add, LongAccumulator::merge).get(); 79 } 80 81 @Benchmark 82 public long par_chain() { 83 return LongStream.range(0, size).parallel() 84 .boxed() 85 .distinct() 86 .distinct() 87 .distinct() 88 .collect(LongAccumulator::new, LongAccumulator::add, LongAccumulator::merge).get(); 89 } 90 91 }