/*
* Copyright 2011 Google Inc. All Rights Reserved.
*
* 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.googlecode.concurrentlinkedhashmap.benchmark;
import static com.googlecode.concurrentlinkedhashmap.benchmark.Benchmarks.createWorkingSet;
import static com.googlecode.concurrentlinkedhashmap.benchmark.Benchmarks.determineEfficiency;
import com.googlecode.concurrentlinkedhashmap.caches.Cache;
import com.googlecode.concurrentlinkedhashmap.caches.Cache.Policy;
import com.googlecode.concurrentlinkedhashmap.caches.CacheBuilder;
import com.googlecode.concurrentlinkedhashmap.generator.Generator;
import com.googlecode.concurrentlinkedhashmap.generator.ScrambledZipfianGenerator;
import org.testng.annotations.Parameters;
import org.testng.annotations.Test;
import org.testng.collections.Lists;
import java.util.EnumSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
* This benchmark compares the hit rate of different cache implementations.
*
* @author ben.manes@gmail.com (Ben Manes)
*/
public final class EfficiencyBenchmark {
@Test(groups = "efficiency")
@Parameters({"capacity", "passes", "generatorMultipler", "workingSetMultiplier"})
public void benchmark(int capacity, int passes, int generatorMultipler,
int workingSetMultiplier) {
Generator generator = new ScrambledZipfianGenerator(generatorMultipler * capacity);
List<List<String>> workingSets = Lists.newArrayList();
for (int i = 1; i <= passes; i++) {
int size = i * workingSetMultiplier * capacity;
workingSets.add(createWorkingSet(generator, size));
}
Set<Policy> seen = EnumSet.noneOf(Policy.class);
for (Cache cache : Cache.values()) {
if (!seen.add(cache.policy())) {
continue;
}
Map<String, String> map = new CacheBuilder()
.maximumCapacity(capacity)
.makeCache(cache);
System.out.println(cache.policy().toString() + ":");
for (List<String> workingSet : workingSets) {
System.out.println(determineEfficiency(map, workingSet));
}
}
}
}