使用jmh進行微基準測試

時間 2019-11-07

標籤使用 jmh 進行基準測試简体版

原文原文鏈接

maven

<dependency>
            <groupId>org.openjdk.jmh</groupId>
            <artifactId>jmh-core</artifactId>
            <version>1.17.5</version>
        </dependency>
        <dependency>
            <groupId>org.openjdk.jmh</groupId>
            <artifactId>jmh-generator-annprocess</artifactId>
            <version>1.17.5</version>
            <scope>provided</scope>
        </dependency>

使用

@BenchmarkMode(Mode.Throughput)
@OutputTimeUnit(TimeUnit.MILLISECONDS)
@Warmup(iterations = 5, time = 3, timeUnit = TimeUnit.SECONDS)
@Measurement(iterations = 20, time = 3, timeUnit = TimeUnit.SECONDS)
@Fork(1)
@State(Scope.Benchmark)
public class DemoJmhTest {

    private String pid;

    @Setup
    public void init() {
       // prepare 
    }
    
    @TearDown
    public void destory() {
       // destory 
    }

    @Benchmark
    public void benchPrecondition(){
        try{
            Preconditions.checkNotNull(pid);
        }catch (Exception e){

        }
    }

    public static void main(String[] args) throws RunnerException {
        Options opt = new OptionsBuilder()
                .include(".*" +DemoJmhTest.class.getSimpleName()+ ".*")
                .forks(1)
                .build();
        new Runner(opt).run();
    }
}