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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 
24 /**
25  * This is meant to be used with {@code --measureMemory} to measure the memory
26  * usage of various {@code Set} implementations.
27  *
28  * @author Christopher Swenson
29  */
30 public class SetCreationBenchmark {
31   @Param({ "3", "6", "11", "23", "45", "91", "181", "362", "724", "1448",
32       "2896", "5793", "11585", "23170", "46341", "92682", "185364", "370728",
33       "741455", "1482910", "2965821", "5931642"})
34   private int size;
35 
36   // "" means no fixed seed
37   @Param("1234")
38   private SpecialRandom random;
39 
40   @Param({"Immutable", "Hash"})
41   private SetImpl impl;
42 
43   // the following must be set during setUp
44   private CollectionBenchmarkSampleData sampleData;
45 
setUp()46   @BeforeExperiment void setUp() {
47     sampleData = new CollectionBenchmarkSampleData(true, random, 0.8, size);
48   }
49 
creation(int reps)50   @Benchmark int creation(int reps) {
51     int x = 0;
52     for (int i = 0; i < reps; i++) {
53       x ^= System.identityHashCode(impl.create(sampleData.getValuesInSet()));
54     }
55     return x;
56   }
57 }
58