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/*
* Copyright (c) 2014, Oracle America, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* * Neither the name of Oracle nor the names of its contributors may be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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package org.openjdk.jmh.samples;
import org.openjdk.jmh.annotations.Benchmark;
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;
public class JMHSample_01_HelloWorld {
/*
* This is our first benchmark method.
*
* JMH works as follows: users annotated the methods with @Benchmark, and
* then JMH produces the generated code to run this particular benchmark
* as reliable as possible. In general, one might think about @Benchmark
* methods as the benchmark "payload", the things we want to measure.
* The surrounding infrastructure is provided by the harness itself.
*
* Read the Javadoc for @Benchmark annotation for complete semantics and
* restrictions. At this point, we only not that the methods names are
* non-essential, and it only matters the methods are marked with
* @Benchmark. You can have multiple benchmark methods within the same class.
*
* Note: if the benchmark method never finishes, then JMH run never
* finishes as well. If you throw the exception from the method body,
* the JMH run ends abruptly for this benchmark, and JMH will run
* the next benchmark down the list.
*
* Although this benchmark measures "nothing", it is the good showcase
* for the overheads the infrastructure bear on the code you measure
* in the method. There are no magical infrastructures which incur no
* overhead, and it's important to know what are the infra overheads
* you are dealing with. You might find this thought unfolded in future
* examples by having the "baseline" measurements to compare against.
*/
@Benchmark
public void wellHelloThere() {
// this method was intentionally left blank.
}
/*
* ============================== HOW TO RUN THIS TEST: ====================================
*
* You are expected to see the run with large number of iterations, and
* very large throughput numbers. You can see that as the estimate of the
* harness overheads per method call. In most of our measurements, it is
* down to several cycles per call.
*
* a) Via command-line:
* $ mvn clean install
* $ java -jar target/benchmarks.jar JMHSample_01
*
* JMH generates self-contained JARs, bundling JMH together with it.
* The runtime options for the JMH are available with "-h":
* $ java -jar target/benchmarks.jar -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_01_HelloWorld.class.getSimpleName())
.forks(1)
.build();
new Runner(opt).run();
}
}