1 /* 2 * Copyright (C) 2010 Google Inc. 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 benchmarks; 18 19 import com.google.caliper.Param; 20 import com.google.caliper.Runner; 21 import com.google.caliper.SimpleBenchmark; 22 23 import java.util.concurrent.ConcurrentHashMap; 24 import java.util.HashMap; 25 import java.util.Hashtable; 26 import java.util.LinkedHashMap; 27 28 /** 29 * How do the various hash maps compare? 30 */ 31 public class HashedCollectionsBenchmark extends SimpleBenchmark { 32 public void timeHashMapGet(int reps) { 33 HashMap<String, String> map = new HashMap<String, String>(); 34 map.put("hello", "world"); 35 for (int i = 0; i < reps; ++i) { 36 map.get("hello"); 37 } 38 } 39 public void timeHashMapGet_Synchronized(int reps) { 40 HashMap<String, String> map = new HashMap<String, String>(); 41 synchronized (map) { 42 map.put("hello", "world"); 43 } 44 for (int i = 0; i < reps; ++i) { 45 synchronized (map) { 46 map.get("hello"); 47 } 48 } 49 } 50 public void timeHashtableGet(int reps) { 51 Hashtable<String, String> map = new Hashtable<String, String>(); 52 map.put("hello", "world"); 53 for (int i = 0; i < reps; ++i) { 54 map.get("hello"); 55 } 56 } 57 public void timeLinkedHashMapGet(int reps) { 58 LinkedHashMap<String, String> map = new LinkedHashMap<String, String>(); 59 map.put("hello", "world"); 60 for (int i = 0; i < reps; ++i) { 61 map.get("hello"); 62 } 63 } 64 public void timeConcurrentHashMapGet(int reps) { 65 ConcurrentHashMap<String, String> map = new ConcurrentHashMap<String, String>(); 66 map.put("hello", "world"); 67 for (int i = 0; i < reps; ++i) { 68 map.get("hello"); 69 } 70 } 71 } 72
