kafka ByteUtilsBenchmark 源码

2022-10-20
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kafka ByteUtilsBenchmark 代码

文件路径：/jmh-benchmarks/src/main/java/org/apache/kafka/jmh/util/ByteUtilsBenchmark.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.kafka.jmh.util;

import java.util.concurrent.ThreadLocalRandom;
import java.util.concurrent.TimeUnit;

import org.apache.kafka.common.utils.ByteUtils;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Level;
import org.openjdk.jmh.annotations.Measurement;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.annotations.Warmup;
import org.openjdk.jmh.runner.Runner;
import org.openjdk.jmh.runner.RunnerException;
import org.openjdk.jmh.runner.options.Options;
import org.openjdk.jmh.runner.options.OptionsBuilder;

@State(Scope.Benchmark)
@OutputTimeUnit(TimeUnit.MILLISECONDS)
@Fork(3)
@Warmup(iterations = 5, time = 1)
@Measurement(iterations = 10, time = 1)
public class ByteUtilsBenchmark {
    private int inputInt;
    private long inputLong;
    @Setup(Level.Iteration)
    public void setUp() {
        inputInt = ThreadLocalRandom.current().nextInt();
        inputLong = ThreadLocalRandom.current().nextLong();
    }

    @Benchmark
    public int testSizeOfUnsignedVarint() {
        return ByteUtils.sizeOfUnsignedVarint(inputInt);
    }

    @Benchmark
    public int testSizeOfUnsignedVarintSimple() {
        int value = inputInt;
        int bytes = 1;
        while ((value & 0xffffff80) != 0L) {
            bytes += 1;
            value >>>= 7;
        }
        return bytes;
    }

    @Benchmark
    public int testSizeOfVarlong() {
        return ByteUtils.sizeOfVarlong(inputLong);
    }

    @Benchmark
    public int testSizeOfVarlongSimple() {
        long v = (inputLong << 1) ^ (inputLong >> 63);
        int bytes = 1;
        while ((v & 0xffffffffffffff80L) != 0L) {
            bytes += 1;
            v >>>= 7;
        }
        return bytes;
    }

    public static void main(String[] args) throws RunnerException {
        Options opt = new OptionsBuilder()
                .include(ByteUtilsBenchmark.class.getSimpleName())
                .forks(2)
                .build();

        new Runner(opt).run();
    }
}

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