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/*
* Copyright (C) 2010 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.primitives;
import com.google.caliper.BeforeExperiment;
import com.google.caliper.Benchmark;
import com.google.caliper.Param;
import com.google.common.jdk5backport.Arrays;
import java.util.Comparator;
import java.util.Random;
/**
* Microbenchmark for {@link UnsignedBytes}.
*
* @author Hiroshi Yamauchi
*/
public class UnsignedBytesBenchmark {
private byte[] ba1;
private byte[] ba2;
private byte[] ba3;
private byte[] ba4;
private Comparator<byte[]> javaImpl;
// 4, 8, 64, 1K, 1M, 1M (unaligned), 64M, 64M (unaligned)
//@Param({"4", "8", "64", "1024", "1048576", "1048577", "6710884", "6710883"})
@Param({"4", "8", "64", "1024" })
private int length;
@BeforeExperiment
void setUp() throws Exception {
Random r = new Random();
ba1 = new byte[length];
r.nextBytes(ba1);
ba2 = Arrays.copyOf(ba1, ba1.length);
// Differ at the last element
ba3 = Arrays.copyOf(ba1, ba1.length);
ba4 = Arrays.copyOf(ba1, ba1.length);
ba3[ba1.length - 1] = (byte) 43;
ba4[ba1.length - 1] = (byte) 42;
javaImpl = UnsignedBytes.lexicographicalComparatorJavaImpl();
}
@Benchmark void longEqualJava(int reps) {
for (int i = 0; i < reps; ++i) {
if (javaImpl.compare(ba1, ba2) != 0) {
throw new Error(); // deoptimization
}
}
}
@Benchmark void diffLastJava(int reps) {
for (int i = 0; i < reps; ++i) {
if (javaImpl.compare(ba3, ba4) == 0) {
throw new Error(); // deoptimization
}
}
}
/*
try {
UnsignedBytesBenchmark bench = new UnsignedBytesBenchmark();
bench.length = 1024;
bench.setUp();
bench.timeUnsafe(100000);
} catch (Exception e) {
}*/
}
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