1 /* 2 * Copyright (C) 2010 The Guava Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.google.common.collect; 18 19 import com.google.caliper.BeforeExperiment; 20 import com.google.caliper.Benchmark; 21 import com.google.caliper.Param; 22 import com.google.common.collect.BenchmarkHelpers.SetImpl; 23 import com.google.common.collect.CollectionBenchmarkSampleData.Element; 24 25 import java.util.Set; 26 27 /** 28 * A microbenchmark that tests the performance of contains() on various Set 29 * implementations. 30 * 31 * @author Kevin Bourrillion 32 */ 33 public class SetContainsBenchmark { 34 // Start at 4.88 then multiply by 2*2^phi <evil cackle> - The goal is be uniform 35 // yet visit a variety of "values-relative-to-the-next-power-of-2" 36 @Param({"5", "30", "180", "1100", "6900", "43000", "260000"}) // "1600000", "9800000" 37 private int size; 38 39 // TODO(kevinb): look at exact (==) hits vs. equals() hits? 40 @Param({"0.2", "0.8"}) 41 private double hitRate; 42 43 @Param("true") 44 private boolean isUserTypeFast; 45 46 // "" means no fixed seed 47 @Param("") 48 private SpecialRandom random; 49 50 @Param({"Hash", "Immutable"}) 51 private SetImpl impl; 52 53 // the following must be set during setUp 54 private Element[] queries; 55 private Set<Element> setToTest; 56 57 @BeforeExperiment void setUp() { 58 CollectionBenchmarkSampleData sampleData = 59 new CollectionBenchmarkSampleData( 60 isUserTypeFast, random, hitRate, size); 61 62 this.setToTest = impl.create(sampleData.getValuesInSet()); 63 this.queries = sampleData.getQueries(); 64 } 65 66 @Benchmark boolean contains(int reps) { 67 // Paranoia: acting on hearsay that accessing fields might be slow 68 // Should write a benchmark to test that! 69 Set<Element> set = setToTest; 70 Element[] queries = this.queries; 71 72 int mask = queries.length - 1; 73 74 boolean dummy = false; 75 for (int i = 0; i < reps; i++) { 76 dummy ^= set.contains(queries[i & mask]); 77 } 78 return dummy; 79 } 80 } 81
