Microbenchmarks with JMH / Java Microbenchmark Harness

Mon, 02 Oct 2017 00:00:00 +0200

Writing microbenchmarks for parts of our applications is not always easy – especially when the internals of the virtual machine, the just-in-time-compiler and such things are coming into effect.

Java Microbenchmark Harness is a tool that takes care of creating JVM warmup-cycles, handling benchmark-input-parameters and running benchmarks as isolated processes etc.

Now following a few short examples for writing microbenchmarks with JMH.

Figure 1. Java JMH Microbenchmarks running in IntelliJ

Snippet: Java 9 Modules and JPMS

Mon, 17 Apr 2017 00:00:00 +0200

Playing around with the new module system in Java 9 I simply wanted to write down how to achieve the most basic tasks.

Therefore I created the following module how-to based upon a simple demonstration project consisting of two dependant modules.

Figure 1. Modules Component-Diagram

Prerequisites and Setup

We need an early access build of the Java ™ 9 JDK, available for download here.

In addition we should make sure, that our environment variable JAVA_HOME is set to the corresponding directory and calling java -version returns something similar to this:

Jdk on Micha Kops' Tech Notes

Microbenchmarks with JMH / Java Microbenchmark Harness

Snippet: Java 9 Modules and JPMS

Prerequisites and Setup