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.tasks.DictionaryWordValue;
  24 
  25 import org.openjdk.jmh.annotations.Benchmark;
  26 import org.openjdk.jmh.annotations.BenchmarkMode;
  27 import org.openjdk.jmh.annotations.Level;
  28 import org.openjdk.jmh.annotations.Mode;
  29 import org.openjdk.jmh.annotations.OutputTimeUnit;
  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.Arrays;
  35 import java.util.concurrent.TimeUnit;
  36 
  37 /**
  38  * Bulk scenario: searching max "wordValue" through the dictionary (array of strings).
  39  */
  40 @BenchmarkMode(Mode.Throughput)
  41 @OutputTimeUnit(TimeUnit.SECONDS)
  42 @State(Scope.Benchmark)
  43 public class Lambda {
  44 
  45     @Setup(Level.Trial)
  46     public void loadData() {
  47         // cause classload and problem initialization
  48         DictionaryProblem.class.getName();
  49     }
  50 
  51     public static Integer maxInt(Integer l, Integer r) {
  52         return l > r ? l : r;
  53     }
  54 
  55     @Benchmark
  56     public int bulk_seq_lambda() {
  57         return Arrays.stream(DictionaryProblem.get())
  58                 .map(s -> DictionaryProblem.wordValue(s))
  59                 .reduce(0, (l, r) -> l > r ? l : r);
  60     }
  61 
  62     @Benchmark
  63     public int bulk_seq_mref() {
  64         return Arrays.stream(DictionaryProblem.get())
  65                 .map(DictionaryProblem::wordValue)
  66                 .reduce(0, Lambda::maxInt);
  67     }
  68 
  69     @Benchmark
  70     public int bulk_par_lambda() {
  71         return Arrays.stream(DictionaryProblem.get()).parallel()
  72                 .map(s -> DictionaryProblem.wordValue(s))
  73                 .reduce(0, (l, r) -> l > r ? l : r);
  74     }
  75 
  76     @Benchmark
  77     public int bulk_par_mref() {
  78         return Arrays.stream(DictionaryProblem.get()).parallel()
  79                 .map(DictionaryProblem::wordValue)
  80                 .reduce(0, Lambda::maxInt);
  81     }
  82 
  83 }