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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.hash;
import com.google.caliper.Param;
import com.google.caliper.Runner;
import com.google.caliper.SimpleBenchmark;
import com.google.common.hash.HashFunction;
import com.google.common.hash.Hashing;
import java.util.Random;
/**
* Benchmarks for comparing the various {@link HashFunction functions} that we provide.
*
* <p>Parameters for the benchmark are:
* <ul>
* <li>size: The length of the byte array to hash.
* </ul>
*
* @author Kurt Alfred Kluever
*/
public class HashFunctionBenchmark extends SimpleBenchmark {
// Use a constant seed for all of the benchmarks to ensure apples to apples comparisons.
private static final int RANDOM_SEED = new Random().nextInt();
@Param({"10", "1000", "100000", "1000000"})
private int size;
private byte[] testBytes;
@Override public void setUp() {
testBytes = new byte[size];
new Random(RANDOM_SEED).nextBytes(testBytes);
}
public int timeMurmur32HashFunction(int reps) {
return runHashFunction(reps, Hashing.murmur3_32());
}
public int timeMurmur128HashFunction(int reps) {
return runHashFunction(reps, Hashing.murmur3_128());
}
public int timeMd5HashFunction(int reps) {
return runHashFunction(reps, Hashing.md5());
}
public int timeSha1HashFunction(int reps) {
return runHashFunction(reps, Hashing.sha1());
}
public int timeSha256HashFunction(int reps) {
return runHashFunction(reps, Hashing.sha256());
}
public int timeSha512HashFunction(int reps) {
return runHashFunction(reps, Hashing.sha512());
}
private int runHashFunction(int reps, HashFunction hashFunction) {
int result = 37;
for (int i = 0; i < reps; i++) {
result ^= hashFunction.hashBytes(testBytes).asInt();
}
return result;
}
public static void main(String[] args) {
Runner.main(HashFunctionBenchmark.class, args);
}
}
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