JMH的測試Demo

工具：IDEA、maven

準備工做：新建一個maven工程，安裝jmh插件，引入依賴的maven的jar包和插件；

依賴的jar包：

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<dependencies>
    <dependency>
        <groupId>org.openjdk.jmh</groupId>
        <artifactId>jmh-core</artifactId>
        <version>1.20</version>
    </dependency>
    <dependency>
        <groupId>org.openjdk.jmh</groupId>
        <artifactId>jmh-generator-annprocess</artifactId>
        <version>1.20</version>
        <scope>provided</scope>
    </dependency>
</dependencies>

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依賴的插件：

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<build>
    <plugins>
        <plugin>
            <groupId>org.codehaus.mojo</groupId>
            <artifactId>exec-maven-plugin</artifactId>
            <executions>
                <execution>
                    <id>run-benchmarks</id>
                    <phase>integration-test</phase>
                    <goals>
                        <goal>exec</goal>
                    </goals>
                    <configuration>
                        <classpathScope>test</classpathScope>
                        <executable>java</executable>
                        <arguments>
                            <argument>-classpath</argument>
                            <classpath />
                            <argument>org.openjdk.jmh.Main</argument>
                            <argument>.*</argument>
                        </arguments>
                    </configuration>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>

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代碼示例：

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package com.test.jmh;

import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
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;

@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.MICROSECONDS)
public class JMHSample_01_HelloWorld {
    @Benchmark
    public void wellHelloWorld(){

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

        Options option = new OptionsBuilder()
                .include(JMHSample_01_HelloWorld.class.getSimpleName()).forks(1).build();

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

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下載的插件名：