68 lines
2.1 KiB
Java
68 lines
2.1 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");
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* you may not use this file except in compliance with the License.
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* 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
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* 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.cache;
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import static com.google.common.base.Preconditions.checkState;
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import com.google.caliper.BeforeExperiment;
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import com.google.caliper.Benchmark;
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import com.google.caliper.Param;
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import com.google.common.cache.LocalCache.Segment;
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import java.util.concurrent.atomic.AtomicReferenceArray;
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/**
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* Benchmark for {@code LocalCache.Segment.expand()}.
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*
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* @author Charles Fry
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*/
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public class SegmentBenchmark {
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@Param({"16", "32", "64", "128", "256", "512", "1024", "2048", "4096", "8192"})
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int capacity;
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private Segment<Object, Object> segment;
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@BeforeExperiment
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void setUp() {
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LocalCache<Object, Object> cache =
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new LocalCache<>(
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CacheBuilder.newBuilder().concurrencyLevel(1).initialCapacity(capacity), null);
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checkState(cache.segments.length == 1);
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segment = cache.segments[0];
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checkState(segment.table.length() == capacity);
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for (int i = 0; i < segment.threshold; i++) {
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cache.put(new Object(), new Object());
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}
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checkState(segment.table.length() == capacity);
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}
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@SuppressWarnings("GuardedBy")
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@Benchmark
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int time(int reps) {
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int dummy = 0;
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AtomicReferenceArray<ReferenceEntry<Object, Object>> oldTable = segment.table;
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for (int i = 0; i < reps; i++) {
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// TODO(b/145386688): This access should be guarded by 'this.segment', which is not currently
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// held
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segment.expand();
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segment.table = oldTable;
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dummy += segment.count;
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}
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return dummy;
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}
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}
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