106 lines
2.8 KiB
Java
106 lines
2.8 KiB
Java
/*
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* Copyright (C) 2010 The Guava Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.common.primitives;
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import com.google.caliper.BeforeExperiment;
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import com.google.caliper.Benchmark;
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import com.google.caliper.Param;
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import java.util.Arrays;
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import java.util.Comparator;
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import java.util.Random;
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/**
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* Microbenchmark for {@link UnsignedBytes}.
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*
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* @author Hiroshi Yamauchi
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*/
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public class UnsignedBytesBenchmark {
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private byte[] ba1;
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private byte[] ba2;
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private byte[] ba3;
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private byte[] ba4;
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private Comparator<byte[]> javaImpl;
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private Comparator<byte[]> unsafeImpl;
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// 4, 8, 64, 1K, 1M, 1M (unaligned), 64M, 64M (unaligned)
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// @Param({"4", "8", "64", "1024", "1048576", "1048577", "6710884", "6710883"})
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@Param({"4", "8", "64", "1024"})
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private int length;
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@BeforeExperiment
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void setUp() throws Exception {
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Random r = new Random();
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ba1 = new byte[length];
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r.nextBytes(ba1);
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ba2 = Arrays.copyOf(ba1, ba1.length);
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// Differ at the last element
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ba3 = Arrays.copyOf(ba1, ba1.length);
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ba4 = Arrays.copyOf(ba1, ba1.length);
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ba3[ba1.length - 1] = (byte) 43;
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ba4[ba1.length - 1] = (byte) 42;
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javaImpl = UnsignedBytes.lexicographicalComparatorJavaImpl();
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unsafeImpl = UnsignedBytes.LexicographicalComparatorHolder.UnsafeComparator.INSTANCE;
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}
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@Benchmark
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void longEqualJava(int reps) {
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for (int i = 0; i < reps; ++i) {
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if (javaImpl.compare(ba1, ba2) != 0) {
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throw new Error(); // deoptimization
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}
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}
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}
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@Benchmark
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void longEqualUnsafe(int reps) {
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for (int i = 0; i < reps; ++i) {
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if (unsafeImpl.compare(ba1, ba2) != 0) {
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throw new Error(); // deoptimization
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}
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}
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}
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@Benchmark
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void diffLastJava(int reps) {
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for (int i = 0; i < reps; ++i) {
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if (javaImpl.compare(ba3, ba4) == 0) {
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throw new Error(); // deoptimization
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}
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}
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}
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@Benchmark
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void diffLastUnsafe(int reps) {
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for (int i = 0; i < reps; ++i) {
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if (unsafeImpl.compare(ba3, ba4) == 0) {
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throw new Error(); // deoptimization
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}
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}
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}
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/*
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try {
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UnsignedBytesBenchmark bench = new UnsignedBytesBenchmark();
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bench.length = 1024;
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bench.setUp();
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bench.timeUnsafe(100000);
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} catch (Exception e) {
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}*/
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}
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