In November 2023 (13-14th), I am going to give workshops in Bern and Zurich, Switzerland. They are the extended version of my DevoxxPL MICROBENCHMARKING - The Art of Realizing One is Wrong talk. But because these will be workshops, things will be hands-on. So bring your laptop and let’s master the maze of benchmarking.

If you want to see the Parallel Programming is Hard talk (in German this time, slides in English) in person, join me for Accento 2023 in Karlsruhe, Germany on 24th October 2023.

I am looking forward to meet you at the JUG Saxony Day 2023 in Dresden on 29 September 2023. This year, my presentation talks about good and hopefully high quality code (not clean code, that is a different story). We will touch simple ideas to motivate you to think about your very own code. In addition, we will talk about APIs, style, tests, and of course, about the longevity of code. See you there!

I was an honor to be invited to speak at Devoxx Poland 2023. It was a really fun conference and I am grateful to have met so many wonderful people, speakers and regular attendees alike.

My first talk was about the right approach to microbenchmarking and the mistakes you can make if you try it a little too naively - MICROBENCHMARKING - The Art of Realizing One is Wrong. About 60 people attended and I was rated with 4.5 of 5 stars. I tried to put too much into the presentation so I had to rush towards the end. Sorry about that, but take as much time as you need to go through the slides.

Friday’s was all about parallel programming and why it is so important to know at least some details about the internals of the JVM in order to programm correctly. PARALLEL PROGRAMMING IS HARD - Why you really need synchronization and it is not what you think. 350 people showed interest and attended my session. It was rated 4.35 out of 5 stars. Many thanks to Douglas Q Hawkins and his 2017 Devoxx talk on Concurrency Concepts in Java. It was both an inspiration and a foundation for my talk.

This talk is about the Java Memory Model and what you should know to write correct multi-threaded code or at least know that you might not have to care about. It shows some of the details that modern languages and frameworks typically fully hide but Java partially still exposes due to its history. When you write a library for multi-threaded use, make sure you understand what you do. If you consume such a library, you hopefully can really on the quality and consistency provided. If the performance of your application is mediocre, maybe you find a possible reason here.

When load and performance testing, a lot of data is captured. This presentation talks about the sheer amount (293,084 data points per second) and how this data is later condensed down to a few meaningful metrics. All of this, hopefully, without losing too much information and still transporting the most important facts.

This talk has been recorded as well and it was given in English.

A newer version of my High Performance Java talk was given at a CinJUG meetup in 2022.

During the pandemic, I gave a remote presentation to the Cincinnati Java User Group about the Java Memory Model.

This is my presentation that was scheduled for JavaLand 2020 but the entire conference got canceled due to the pandemic (in case you read that sometime in future, that was the Covid-19 pandemic). This talk is about all the tricks the JVM applies to get your code executed as quickly as possible. That includes compiler and optimization stages, dropping of code, and more. Also, it is about the modern CPUs and how they optimize code execution. Your code runs in parts concurrently on the CPU without you even knowing that.

When testing load and performance, one always faces the problem how to communicate the state and results. Not every stakeholder understands numbers as well as the load testers do, therefore communication might raise more questions than it answers. This talk suggests a simple rating system to convey a test result to many different people in a consitent manner.

The Javaland 2020 presentation, with marginal changes, was also given at the JUG Saxony Day 2019 in Dresden.

Please note, I was horribly overrunning and so I continued into the lunch break. This part has not been recorded.