org.openjdk.jmh.samples.JMHSample_30_Interrupts Maven / Gradle / Ivy
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* accompanied this code).
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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.Group;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
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;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
@BenchmarkMode(Mode.AverageTime)
@State(Scope.Group)
public class JMHSample_30_Interrupts {
/*
* JMH can also detect when threads are stuck in the benchmarks, and try
* to forcefully interrupt the benchmark thread. JMH tries to do that
* when it is arguably sure it would not affect the measurement.
*/
/*
* In this example, we want to measure the simple performance characteristics
* of the ArrayBlockingQueue. Unfortunately, doing that without a harness
* support will deadlock one of the threads, because the executions of
* take/put are not paired perfectly. Fortunately for us, both methods react
* to interrupts well, and therefore we can rely on JMH to terminate the
* measurement for us. JMH will notify users about the interrupt actions
* nevertheless, so users can see if those interrupts affected the measurement.
*
* This is a variant of org.openjdk.jmh.samples.JMHSample_18_Control, but without
* the explicit control objects. This example is suitable for the methods which
* react to interrupts gracefully.
*/
private BlockingQueue q;
@Setup
public void setup() {
q = new ArrayBlockingQueue(1);
}
@Group("Q")
@Benchmark
public Integer take() throws InterruptedException {
return q.take();
}
@Group("Q")
@Benchmark
public void put() throws InterruptedException {
q.put(42);
}
/*
* ============================== HOW TO RUN THIS TEST: ====================================
*
* You can run this test:
*
* a) Via the command line:
* $ mvn clean install
* $ java -jar target/benchmarks.jar ".*JMHSample_30.*" -wi 5 -i 5 -t 2 -f 5
* (we requested 5 warmup iterations, 5 iterations, 2 threads, and 5 forks)
*
* 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_30_Interrupts.class.getSimpleName() + ".*")
.warmupIterations(5)
.measurementIterations(5)
.threads(2)
.forks(5)
.build();
new Runner(opt).run();
}
}
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