1 /* 2 * Copyright (C) 2011 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.cache; 18 19 import com.google.caliper.BeforeExperiment; 20 import com.google.caliper.Benchmark; 21 import com.google.caliper.Param; 22 import com.google.common.cache.LocalCache.ReferenceEntry; 23 import com.google.common.cache.LocalCache.Segment; 24 25 /** 26 * Benchmark for {@code LocalCache.Segment.removeEntryFromChain}. 27 * 28 * @author Charles Fry 29 */ 30 public class ChainBenchmark { 31 32 @Param({"1", "2", "3", "4", "5", "6"}) int length; 33 34 private Segment<Object, Object> segment; 35 private ReferenceEntry<Object, Object> head; 36 private ReferenceEntry<Object, Object> chain; 37 38 @BeforeExperiment 39 void setUp() { 40 LocalCache<Object, Object> cache = new LocalCache<Object, Object>( 41 CacheBuilder.newBuilder() 42 .concurrencyLevel(1), null); 43 segment = cache.segments[0]; 44 chain = null; 45 for (int i = 0; i < length; i++) { 46 Object key = new Object(); 47 chain = segment.newEntry(key, cache.hash(key), chain); 48 if (i == 0) { 49 head = chain; 50 } 51 } 52 } 53 54 @Benchmark int time(int reps) { 55 int dummy = 0; 56 for (int i = 0; i < reps; i++) { 57 segment.removeEntryFromChain(chain, head); 58 dummy += segment.count; 59 } 60 return dummy; 61 } 62 } 63
