Micro Benchmark Framework java 基准测试类库

Micro Benchmark Framework 框架主要是method 层面上的 benchmark，精度可以精确到微秒级
比较典型的使用场景还有：

• 想定量地知道某个函数需要执行多长时间，以及执行时间和输入 n 的相关性
• 一个函数有两种不同实现，不知道哪种实现性能更好

简单demo

• 创建项目

mvn archetype:generate \

          -DinteractiveMode=false \

          -DarchetypeGroupId=org.openjdk.jmh \

          -DarchetypeArtifactId=jmh-java-benchmark-archetype \

          -DgroupId=com.dalong \

          -DartifactId=demo-jmh \

          -Dversion=1.0

• pom 文件

 <?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0"

         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>

​

    <groupId>com.dalong</groupId>

    <artifactId>mybenchmark</artifactId>

    <version>1.0-SNAPSHOT</version>

​

    <properties>

        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

        <uberjar.name>benchmarks</uberjar.name>

    </properties>

   <dependencies>

       <dependency>

           <groupId>org.openjdk.jmh</groupId>

           <artifactId>jmh-core</artifactId>

           <version>1.17.2</version>

       </dependency>

       <dependency>

           <groupId>org.openjdk.jmh</groupId>

           <artifactId>jmh-generator-annprocess</artifactId>

           <version>1.17.2</version>

           <scope>provided</scope>

       </dependency>

   </dependencies>

    <build>

        <plugins>

            <plugin>

                <groupId>org.apache.maven.plugins</groupId>

                <artifactId>maven-compiler-plugin</artifactId>

                <version>3.1</version>

            </plugin>

            <plugin>

                <groupId>org.apache.maven.plugins</groupId>

                <artifactId>maven-shade-plugin</artifactId>

                <version>2.2</version>

                <executions>

                    <execution>

                        <phase>package</phase>

                        <goals>

                            <goal>shade</goal>

                        </goals>

                        <configuration>

                            <finalName>${uberjar.name}</finalName>

                            <transformers>

                                <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">

                                    <mainClass>org.openjdk.jmh.Main</mainClass>

                                </transformer>

                            </transformers>

                            <filters>

                                <filter>

                                    <artifact>*:*</artifact>

                                    <excludes>

                                        <exclude>META-INF/*.SF</exclude>

                                        <exclude>META-INF/*.DSA</exclude>

                                        <exclude>META-INF/*.RSA</exclude>

                                    </excludes>

                                </filter>

                            </filters>

                        </configuration>

                    </execution>

                </executions>

            </plugin>

        </plugins>

        <pluginManagement>

            <plugins>

                <plugin>

                    <artifactId>maven-clean-plugin</artifactId>

                    <version>2.5</version>

                </plugin>

                <plugin>

                    <artifactId>maven-deploy-plugin</artifactId>

                    <version>2.8.1</version>

                </plugin>

                <plugin>

                    <artifactId>maven-install-plugin</artifactId>

                    <version>2.5.1</version>

                </plugin>

                <plugin>

                    <artifactId>maven-jar-plugin</artifactId>

                    <version>2.4</version>

                </plugin>

                <plugin>

                    <artifactId>maven-resources-plugin</artifactId>

                    <version>2.6</version>

                </plugin>

                <plugin>

                    <artifactId>maven-site-plugin</artifactId>

                    <version>3.3</version>

                </plugin>

                <plugin>

                    <artifactId>maven-surefire-plugin</artifactId>

                    <version>2.17</version>

                </plugin>

            </plugins>

        </pluginManagement>

    </build>

</project>

• 简单基准测试代码

package com.dalong;

import org.openjdk.jmh.annotations.*;

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;

​

import java.util.concurrent.TimeUnit;

​

import static java.util.concurrent.TimeUnit.MICROSECONDS;

​

@BenchmarkMode(Mode.AverageTime)

@OutputTimeUnit(MICROSECONDS)

@State(Scope.Thread)

public class FirstBenchmark {

​

    @Benchmark

    public int sleepAWhile() {

        try {

            Thread.sleep(500);

        } catch (InterruptedException e) {

            // ignore

        }

        return 0;

    }

​

    @Benchmark

    public void testMethod() {

        int a = 1;

        int b = 2;

        int sum = a + b;

    }

    public static void main(String[] args) throws RunnerException {

        Options opt = new OptionsBuilder()

                .include(FirstBenchmark.class.getSimpleName())

                .forks(1)

                .warmupIterations(5)

                .measurementIterations(5)

                .build();

​

        new Runner(opt).run();

    }

}

运行&&效果

• 构建

mvn clean package

• 运行

java -jar target/benchmarks.jar

效果

几个参考资料

http://blog.dyngr.com/blog/2016/10/29/introduction-of-jmh/ 简单介绍的
http://tutorials.jenkov.com/java-performance/jmh.html 很不错的文章