Simple RandomGenerator JMH benchmark

RandomJMH.java

package dev.mbien.jmh;


import java.util.concurrent.TimeUnit;
import java.util.random.RandomGenerator;
import java.util.random.RandomGeneratorFactory;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Level;
import org.openjdk.jmh.annotations.Measurement;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Param;
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.infra.Blackhole;
import org.openjdk.jmh.results.format.ResultFormatType;
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;

@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@Warmup(iterations = 5, time = 5, timeUnit = TimeUnit.SECONDS)
@Measurement(iterations = 5, time = 5, timeUnit = TimeUnit.SECONDS)
@Fork(1)
@State(Scope.Benchmark)
public class RandomJMH {

    @Param({})
    public String name;
    
    private RandomGenerator rng;

    @Setup(Level.Iteration)
    public void setup() {
        rng = RandomGeneratorFactory.of(name).create(42);
    }

    @Benchmark
    public void rngInt(Blackhole bh) throws InterruptedException {
        rng.nextInt();
    }

    @Benchmark
    public void rngLong(Blackhole bh) throws InterruptedException {
        rng.nextLong();
    }

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

        String[] names = RandomGeneratorFactory.all()
                .map(t -> t.name()).sorted().toArray(String[]::new);

        Options opt = new OptionsBuilder()
                .include(RandomJMH.class.getSimpleName())
                .resultFormat(ResultFormatType.JSON)
                .result("results/"+RandomJMH.class.getSimpleName()+".json")
                .param("name", names)
                .build();

        new Runner(opt).run();
    }

}