org.openjdk.jmh.samples.JMHSample_04_DefaultState Maven / Gradle / Ivy

/*
 * Copyright (c) 2014, Oracle America, Inc.
 * All rights reserved.
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 *    this list of conditions and the following disclaimer.
 *
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 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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package org.openjdk.jmh.samples;

import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.State;
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;

/*
 * Fortunately, in many cases you just need a single state object.
 * In that case, we can mark the benchmark instance itself to be
 * the @State. Then, we can reference its own fields as any
 * Java program does.
 */

@State(Scope.Thread)
public class JMHSample_04_DefaultState {

    double x = Math.PI;

    @Benchmark
    public void measure() {
        x++;
    }

    /*
     * ============================== HOW TO RUN THIS TEST: ====================================
     *
     * You can see the benchmark runs as usual.
     *
     * You can run this test:
     *
     * a) Via the command line:
     *    $ mvn clean install
     *    $ java -jar target/benchmarks.jar JMHSample_04 -f 1
     *    (we requested single fork; there are also other options, see -h)
     *
     * 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_04_DefaultState.class.getSimpleName())
                .forks(1)
                .build();

        new Runner(opt).run();
    }

}