Wednesday, May 4, 2016

Java Performance Monitoring


http://tutorials.jenkov.com/java-performance/jmh.html
When you build your JMH benchmarks, Maven will always generate a JAR file named benchmarks.jar in the target directory (Maven's standard output directory).
The benchmarks.jar file contains everything needed to run your benchmarks. It contains your compiled benchmark classes as well as all JMH classes needed to run the benchmark.
If your benchmarks has any external dependencies (JAR files from other projects needed to run your benchmarks), declare these dependencies inside the Maven pom.xml, and they will be included in thebenchmarks.jar too.

Since benchmarks.jar is fully self contained, you can copy that JAR file to another computer to run your JMH benchmarks on that computer.

https://antoniogoncalves.org/2015/01/15/micro-benchmarking-with-jmh-measure-dont-guess/
http://stackoverflow.com/questions/28936559/run-micro-benchmark-in-application-servers-jmh
 * <p>{@link Benchmark} demarcates the benchmark payload, and JMH treats it specifically
 * as the wrapper which contains the benchmark code. In order to run the benchmark reliably,
 * JMH enforces a few stringent properties for these wrapper methods, including, but not
 * limited to:</p>
@Benchmark is the annotation demarcating the piece of code JMH should treat as benchmark body. It is not a magic annotation which measures any given method elsewhere in the program. And, you are not supposed to call @Benchmark methods on your own.
What you want is not benchmark, it's a tracing/monitoring/profiling solution which can instrument and account all the stages the request gets through. JMH is not such a solution, you should look elsewhere.


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