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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.hash;
import com.google.caliper.Param;
import com.google.caliper.Runner;
import com.google.caliper.SimpleBenchmark;
import java.util.Random;
/**
* Benchmarks for hashing functions. This class benchmarks various hasing functions for a range of
* sizes of byte array. The input data is generated by a call to {@link Random#nextBytes}.
*
* <p>Parameters for the benchmark are:
* <ul>
* <li>size: The length of the byte array to hash.
* <li>function: The name of the function(s) to test (eg, "goodFastHash32" or "murmur3_32")
* </ul>
*
* @author David Beaumont
*/
public class HashBenchmark extends SimpleBenchmark {
@Param({"10", "1000", "1000000"})
private int size;
@Param private HashType function;
private enum HashType {
goodFastHash32() {
@Override public long hash(byte[] data) {
return Hashing.goodFastHash(32).hashBytes(data).asInt();
}
},
goodFastHash64() {
@Override public long hash(byte[] data) {
return Hashing.goodFastHash(64).hashBytes(data).asLong();
}
},
murmur32() {
@Override public long hash(byte[] data) {
return Hashing.murmur3_32().hashBytes(data).asInt();
}
},
murmur128() {
@Override public long hash(byte[] data) {
return Hashing.murmur3_128().hashBytes(data).asLong();
}
},
md5() {
@Override public long hash(byte[] data) {
return Hashing.md5().hashBytes(data).asLong();
}
};
public abstract long hash(byte[] data);
}
private byte[] testData;
@Override
protected void setUp() {
testData = new byte[size];
new Random().nextBytes(testData);
}
public int timeHashFunction(int reps) {
long dummy = 0;
for (int i = 0; i < reps; i++) {
dummy ^= function.hash(testData);
}
return (int) dummy;
}
public static void main(String[] args) {
Runner.main(HashBenchmark.class, args);
}
}
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