1 /* 2 * Copyright (C) 2012 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 * Test iteration speed at various size for {@link Set} instances. 29 * 30 * @author Christopher Swenson 31 */ 32 public class SetIterationBenchmark { 33 @Param({ "3", "6", "11", "23", "45", "91", "181", "362", "724", "1448", 34 "2896", "5793", "11585", "23170", "46341", "92682", "185364", "370728", 35 "741455", "1482910", "2965821", "5931642"}) 36 private int size; 37 38 // "" means no fixed seed 39 @Param("1234") 40 private SpecialRandom random; 41 42 @Param({"Immutable", "Hash"}) 43 private SetImpl impl; 44 45 // the following must be set during setUp 46 private Set<Element> setToTest; 47 48 @BeforeExperiment void setUp() { 49 CollectionBenchmarkSampleData sampleData = 50 new CollectionBenchmarkSampleData(true, random, 0.8, size); 51 setToTest = impl.create(sampleData.getValuesInSet()); 52 } 53 54 @Benchmark int iteration(int reps) { 55 int x = 0; 56 57 for (int i = 0; i < reps; i++) { 58 for (Element y : setToTest) { 59 x ^= System.identityHashCode(y); 60 } 61 } 62 return x; 63 } 64 } 65
