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/*
* Copyright (C) 2011 The Guava Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.common.cache;
import static com.google.common.base.Preconditions.checkState;
import com.google.caliper.Param;
import com.google.caliper.Runner;
import com.google.caliper.SimpleBenchmark;
import com.google.common.cache.LocalCache.ReferenceEntry;
import com.google.common.cache.LocalCache.Segment;
import java.util.concurrent.atomic.AtomicReferenceArray;
/**
* Benchmark for {@code LocalCache.Segment.expand()}.
*
* @author Charles Fry
*/
public class SegmentBenchmark extends SimpleBenchmark {
@Param({"16", "32", "64", "128", "256", "512", "1024", "2048", "4096", "8192"}) int capacity;
private Segment<Object, Object> segment;
@Override
protected void setUp() {
LocalCache<Object, Object> cache = new LocalCache<Object, Object>(
CacheBuilder.newBuilder()
.concurrencyLevel(1)
.initialCapacity(capacity), null);
checkState(cache.segments.length == 1);
segment = cache.segments[0];
checkState(segment.table.length() == capacity);
for (int i = 0; i < segment.threshold; i++) {
cache.put(new Object(), new Object());
}
checkState(segment.table.length() == capacity);
}
public int time(int reps) {
int dummy = 0;
AtomicReferenceArray<ReferenceEntry<Object, Object>> oldTable = segment.table;
for (int i = 0; i < reps; i++) {
segment.expand();
segment.table = oldTable;
dummy += segment.count;
}
return dummy;
}
public static void main(String[] args) {
Runner.main(SegmentBenchmark.class, args);
}
}
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