René Schwietzke
banner
reneschwietzke.bsky.social
René Schwietzke
@reneschwietzke.bsky.social
Tester and Java Developer, Passionate Performance Dude. Working at Xceptance. Public speaker #JVM #Java #Performance #QA #LoadTest #Quality #Testing

Mastodon: @reneschwietzke@foojay.social
I find LinkedIn extremely stressful for obvious reasons that I would rather not discuss here. It would simply be impolite.
November 17, 2025 at 1:32 PM
For any of my EU followers, I give away two Seoul T-Money public transportation cards. Charged with two to three rides each, ready to be used when you get into the city. Will mail them to you for free. Frees you of the hassle to buy them and get cash to charge them. They are rechargeable!
November 15, 2025 at 2:02 PM
Captchas taken to the next level in Korea. I had to screenshot and zoom to see anything.
November 2, 2025 at 2:13 AM
Reposted by René Schwietzke
October 29, 2025 at 12:51 PM
If you missed my 1BRC talk at Jfokus 2025 Stockholm, here you go: youtu.be/dY0ybuNQKFo?...

Enjoy and feedback is appreciated.
The First 80% of Reading One Billion Rows Fast Enough by René Schwietzke
YouTube video by Jfokus
youtu.be
February 11, 2025 at 4:12 PM
Thanks for rating my #jfokus talk 4.52/5.00. Glad you liked it.

Slides for public consumption, sharing, and plundering: training.xceptance.com/java/451-the...
The repo: github.com/rschwietzke/...
1BRC - The First 80% of the Journey
1BRC - The First 80% of the Journey
training.xceptance.com
February 5, 2025 at 4:39 PM
And here you go, the slides to my presentation: training.xceptance.com/java/451-the...

Because people asked... they are built using reveal.js.

#jfokus
February 5, 2025 at 2:34 PM
#Jfokus went the extra mile and ordered snow.
February 4, 2025 at 7:36 AM
How fast can you process a billion rows? This talk will guide you through initial tuning steps to achieve a 5x speed improvement. Learn about the JDK, the JVM, and your hardware, and gain insights you can apply to everyday challenges. You'll also learn when not to do that!

#jfokus #jfokus2025
February 3, 2025 at 2:02 PM
Hello Stockholm, hello #jfokus. Was a pleasant trip.
January 31, 2025 at 10:49 PM
May the transit stuff be with me.. #jfokus2025 #DB #BER #SAS
January 31, 2025 at 11:53 AM
Just started to measure all data in my talk again to ensure it is fresh and fits the latest hardware.
#jfokus2025
January 31, 2025 at 10:57 AM
Before you go on a business trip, you ensure that your girlfriend is not running short of quality bread.

Freshly baked sourdough bread.
January 30, 2025 at 8:52 PM
In case you make it to JFokus 2025 Stockholm, I would be delighted to see you at my talk "The First 80% of Reading One Billion Rows Fast Enough".

jfokus.se/talks/2178
Jfokus
Jfokus is all about developers! Check out the conference: https://www.jfokus.se
jfokus.se
January 30, 2025 at 7:23 AM
Load testing with and for customers.

performance bad, services crash.

Conclusion: Adjust the test cases to do less of this and that. This will help to keep the services running.

I don't think people understand the concept of testing.
December 12, 2024 at 10:33 AM
When IT sucks, I often escape the world by just baking bread.
November 22, 2024 at 11:27 PM
Greetings into my #Java bubble. Trying to flee X for good. Will see how much is going to happen here and when to cut the cord. Happy to be here!
November 21, 2024 at 1:45 PM
Die Xceptance GmbH lädt mit der JUG Saxony zur praxisnahen Einführung in Web-Accessibility ein. Die Veranstaltung gibt Einblicke in die Entwicklung, das Testen und die rechtlichen Anforderungen.

Do, 28.11.2024, 14:00 Uhr, Xceptance GmbH, Leutragraben 2-4, Jena

jugsaxony.org/timeline/202...
November 21, 2024 at 1:44 PM