56 lines
1.6 KiB
Java
56 lines
1.6 KiB
Java
/*
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* Copyright (C) 2011 The Guava Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
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* in compliance with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software distributed under the
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* License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
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* express or implied. See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.common.collect;
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import com.google.caliper.BeforeExperiment;
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import com.google.caliper.Benchmark;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Random;
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/**
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* Benchmark for HashMultiset.add for an already-present element.
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*
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* @author Louis Wasserman
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*/
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public class HashMultisetAddPresentBenchmark {
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private static final int ARRAY_MASK = 0x0ffff;
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private static final int ARRAY_SIZE = 0x10000;
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List<Multiset<Integer>> multisets = new ArrayList<>(0x10000);
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int[] queries = new int[ARRAY_SIZE];
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@BeforeExperiment
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void setUp() {
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Random random = new Random();
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multisets.clear();
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for (int i = 0; i < ARRAY_SIZE; i++) {
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HashMultiset<Integer> multiset = HashMultiset.<Integer>create();
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multisets.add(multiset);
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queries[i] = random.nextInt();
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multiset.add(queries[i]);
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}
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}
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@Benchmark
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int add(int reps) {
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int tmp = 0;
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for (int i = 0; i < reps; i++) {
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int j = i & ARRAY_MASK;
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tmp += multisets.get(j).add(queries[j], 4);
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}
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return tmp;
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}
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}
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