Jmh: @Param: Benchmark with different values

Using @Param annotation, we can benchmark a method by passing different values.

 

Example

 

public class ParamDemo {

    @Param({ "2978169", "3324329", "53", "71", "1191267381" })
    public long primes;

    @Param({ "2", "4", "8", "16" })
    public int certainty;
    
    @Benchmark
    public boolean bench() {
        return BigInteger.valueOf(primes).isProbablePrime(certainty);
    }

    ..........
    ..........
}

 

Param fields should be non-final fields, and should only reside in State classes. JMH will inject the value into the annotated field before any Setup method is called. It is not guaranteed the field value would be accessible in any initializer or any constructor of State.

 

Find the below working application.

 

ParamDemo.java

package com.sample.app;

import java.io.IOException;
import java.math.BigInteger;
import java.util.concurrent.TimeUnit;

import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Fork;
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.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;

@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@Warmup(iterations = 3, time = 3, timeUnit = TimeUnit.SECONDS)
@Measurement(iterations = 3, time = 3, timeUnit = TimeUnit.SECONDS)
@Fork(2)
@State(Scope.Benchmark)
public class ParamDemo {

    @Param({ "2978169", "3324329", "53", "71", "1191267381" })
    public long primes;

    @Param({ "2", "4", "8", "16" })
    public int certainty;
    
    @Benchmark
    public boolean bench() {
        return BigInteger.valueOf(primes).isProbablePrime(certainty);
    }

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

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

 

 

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