org.openjdk.jmh.samples.JMHSample_27_Params Maven / Gradle / Ivy

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 * Copyright (c) 2014, Oracle America, Inc.
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package org.openjdk.jmh.samples;

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;

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

@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@Warmup(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)
@Measurement(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)
@Fork(1)
@State(Scope.Benchmark)
public class JMHSample_27_Params {

    /**
     * In many cases, the experiments require walking the configuration space
     * for a benchmark. This is needed for additional control, or investigating
     * how the workload performance changes with different settings.
     */

    @Param({"1", "31", "65", "101", "103"})
    public int arg;

    @Param({"0", "1", "2", "4", "8", "16", "32"})
    public int certainty;

    @Benchmark
    public boolean bench() {
        return BigInteger.valueOf(arg).isProbablePrime(certainty);
    }

    /*
     * ============================== HOW TO RUN THIS TEST: ====================================
     *
     * Note the performance is different with different parameters.
     *
     * You can run this test:
     *
     * a) Via the command line:
     *    $ mvn clean install
     *    $ java -jar target/benchmarks.jar JMHSample_27
     *
     *    You can juggle parameters through the command line, e.g. with "-p arg=41,42"
     *
     * b) Via the Java API:
     *    (see the JMH homepage for possible caveats when running from IDE:
     *      http://openjdk.java.net/projects/code-tools/jmh/)
     */

    public static void main(String[] args) throws RunnerException {
        Options opt = new OptionsBuilder()
                .include(JMHSample_27_Params.class.getSimpleName())
//                .param("arg", "41", "42") // Use this to selectively constrain/override parameters
                .build();

        new Runner(opt).run();
    }

}