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SetIterationBenchmark.java
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/
SetIterationBenchmark.java
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/*
* Copyright (C) 2012 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.collect;
import com.google.caliper.BeforeExperiment;
import com.google.caliper.Benchmark;
import com.google.caliper.Param;
import com.google.common.collect.BenchmarkHelpers.SetImpl;
import com.google.common.collect.CollectionBenchmarkSampleData.Element;
import java.util.Set;
/**
* Test iteration speed at various size for {@link Set} instances.
*
* @author Christopher Swenson
*/
public class SetIterationBenchmark {
@Param({
"3", "6", "11", "23", "45", "91", "181", "362", "724", "1448", "2896", "5793", "11585", "23170",
"46341", "92682", "185364", "370728", "741455", "1482910", "2965821", "5931642"
})
private int size;
// "" means no fixed seed
@Param("1234")
private SpecialRandom random;
@Param({"ImmutableSetImpl", "HashSetImpl"})
private SetImpl impl;
// the following must be set during setUp
private Set<Element> setToTest;
@BeforeExperiment
void setUp() {
CollectionBenchmarkSampleData sampleData =
new CollectionBenchmarkSampleData(true, random, 0.8, size);
setToTest = (Set<Element>) impl.create(sampleData.getValuesInSet());
}
@Benchmark
int iteration(int reps) {
int x = 0;
for (int i = 0; i < reps; i++) {
for (Element y : setToTest) {
x ^= System.identityHashCode(y);
}
}
return x;
}
}