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/*
* Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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package org.openjdk.jmh.samples;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.GenerateMicroBenchmark;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
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.util.concurrent.TimeUnit;
public class JMHSample_02_BenchmarkModes {
/*
* JMH generates lots of synthetic code for the microbenchmarks for
* you during the compilation. JMH can measure the methods in lots
* of modes, and it will generate all the needed code at once.
* Users may select the default benchmark mode with the special
* annotation, or select/override the mode via the command line.
*
* With this scenario, we start to measure something useful. Note
* that we can conveniently have the exception at the benchmark method,
* in order to reduce some of the clutter.
*
* P.S. It is helping at times to look into the generated code trying
* to diagnose the performance issue. You might see you don't measuring
* it right! The generated code for this particular sample is somewhere at
* target/generated-sources/annotations/.../JMHSample_02_BenchmarkModes.java
*/
/*
* This benchmark type measures the raw throughput.
* We are using the special annotation to select the units to measure in,
* although you can use the default.
*/
@GenerateMicroBenchmark
@BenchmarkMode(Mode.Throughput)
@OutputTimeUnit(TimeUnit.SECONDS)
public void measureThroughput() throws InterruptedException {
TimeUnit.MILLISECONDS.sleep(100);
}
/*
* This benchmark type measures the average execution time.
* Some might say it is the reciprocal throughput, and it really is.
* There are workloads where measuring times is more convenient though.
*/
@GenerateMicroBenchmark
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.MICROSECONDS)
public void measureAvgTime() throws InterruptedException {
TimeUnit.MILLISECONDS.sleep(100);
}
/*
* This benchmark type samples the execution time.
* With this benchmark, we are gathering the execution timings on their own,
* which allows us to infer the distributions, percentiles, etc.
*
* At this point, JMH only calculates percentile estimates.
*
* JMH also tries to auto-adjust sampling frequency: if the method
* is long enough, you will end up capturing all the samples.
*/
@GenerateMicroBenchmark
@BenchmarkMode(Mode.SampleTime)
@OutputTimeUnit(TimeUnit.MICROSECONDS)
public void measureSamples() throws InterruptedException {
TimeUnit.MILLISECONDS.sleep(100);
}
/*
* This benchmark type measures the single method invocation time.
* This mode is useful to do cold startup tests, when you specifically
* do not want to call the benchmark method continuously.
*/
@GenerateMicroBenchmark
@BenchmarkMode(Mode.SingleShotTime)
@OutputTimeUnit(TimeUnit.MICROSECONDS)
public void measureSingleShot() throws InterruptedException {
TimeUnit.MILLISECONDS.sleep(100);
}
/*
* We can also ask for multiple benchmark modes at once. All the tests
* above can be replaced with just a single test like this:
*/
@GenerateMicroBenchmark
@BenchmarkMode({Mode.Throughput, Mode.AverageTime, Mode.SampleTime, Mode.SingleShotTime})
@OutputTimeUnit(TimeUnit.MICROSECONDS)
public void measureMultiple() throws InterruptedException {
TimeUnit.MILLISECONDS.sleep(100);
}
/*
* Or even...
*/
@GenerateMicroBenchmark
@BenchmarkMode(Mode.All)
@OutputTimeUnit(TimeUnit.MICROSECONDS)
public void measureAll() throws InterruptedException {
TimeUnit.MILLISECONDS.sleep(100);
}
/*
* ============================== HOW TO RUN THIS TEST: ====================================
*
* You are expected to see the different run modes for the same benchmark.
* Note the units are different, scores are consistent with each other.
*
* You can run this test:
*
* a) Via the command line:
* $ mvn clean install
* $ java -jar target/microbenchmarks.jar ".*JMHSample_02.*" -wi 5 -i 5 -f 1
* (we requested 5 warmup/measurement iterations, single fork)
*
* b) Via the Java API:
*/
public static void main(String[] args) throws RunnerException {
Options opt = new OptionsBuilder()
.include(".*" + JMHSample_02_BenchmarkModes.class.getSimpleName() + ".*")
.warmupIterations(5)
.measurementIterations(5)
.forks(1)
.build();
new Runner(opt).run();
}
}
