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René Schwietzke

@reneschwietzke@foojay.social
mastodon 4.7.3
  • Open on foojay.social

#QA and #softwaretest person, #developer, #Java performance dude, web performance dude, a dude in general.

This account focuses on nerd stuff such as software and often Java or other programming magic.

338 Followers
523 Following
22 Posts
Joined November 20, 2022
GITHUB:
https://github.com/rschwietzke
WORK:
https://www.xceptance.com/
BLOG:
https://www.reneschwietzke.de/
Open post
René Schwietzke @reneschwietzke@foojay.social
· 5mo ago

Dear #DB, two long distance rides with two transfers each. Both rides on time, from end to end. Small delay from Cologne to Frankfurt but buffered off in Frankfurt. Thank you.

foojay.social
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Open post
René Schwietzke @reneschwietzke@foojay.social
· 5mo ago

Thanks for attending my talk. More than 200 people showed up. It was a blast. Thanks for all the positive feedback.

And yes, it is still Java code, but highly optimized. :)

As promised, the slides: https://training.xceptance.com/java/460-the-first-80p-of-1BRC-parallel-edition.html

#1brc #talk #jcon2026 #performance #java

training.xceptance.com
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Open post
René Schwietzke @reneschwietzke@foojay.social
· 5mo ago

Starting to @jcon@mastodon.social in Cologne now... and it is raining cats and dogs.#jcon2026

foojay.social

Foojay, the Friends Of OpenJDK

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Open post
René Schwietzke @reneschwietzke@foojay.social
· 4mo ago

@jorge@social.jagedn.dev I think the Chinese will pressure, and there might be eventually one company that goes truly open source with a model. Also, a lot of research is open. A Mozilla LLM model park so to speak... even though Mozilla really lost a lot of credit.

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Open post
René Schwietzke @reneschwietzke@foojay.social
· 4mo ago

@jorge@social.jagedn.dev They likely played the burn-tokens and get recognized game, as many larger companies did. It was not about sensible work, just about weird metrics.

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Open post
René Schwietzke @reneschwietzke@foojay.social
· 4mo ago

@otfrom@functional.cafe But GitHub is hosted and the other two are self-hosted. Not entirely the same. Or did I miss something?

We have been running Gitlab Community for ages. Too many security releases IMHO but besides that, it runs fine. Self-hosted on a private Hetzner machine in Finland.

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Open post
René Schwietzke @reneschwietzke@foojay.social
· 5mo ago
Replying to
@FrVaBe@mastodon.social Lichtblick Ökostrom Vario. Works even with analog metering. You just have to enter the number once a month into that app.
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Open post
René Schwietzke @reneschwietzke@foojay.social
· 5mo ago

Just got the information that I have to pay 2 cents less in May per kWh electricity than April. 28.2 Cents. It is a dynamic price and set per month based on energy prices at EEX.

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Open post
René Schwietzke @reneschwietzke@foojay.social
· 5mo ago

If you are keen to learn how and how far you can optimize data processing to save CPU and memory, basically money 💰, I invite you to my #JCON2026 talk: "Conquering a Billion Rows with Java Concurrency".

I promise a huge "Wow, really?".

📅 Wednesday, 22 April 2026, 17:00 CEST
📍 Cinema 6, Cinedom Cologne, JCON

foojay.social
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Open post
René Schwietzke @reneschwietzke@foojay.social
· 5mo ago

#jcon2026 Arrived in Cologne and at the Media Park. Just doing what I always do before a talk... sifting it again and again.

foojay.social

Foojay, the Friends Of OpenJDK

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Open post
René Schwietzke @reneschwietzke@foojay.social
· 5mo ago

Liebe #DB, heute wird gelobt. Alle Züge pünktlich auf meiner Verbindung. Personal freundlich und Züge sauber. Danke

#jena #Köln

foojay.social
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Open post
René Schwietzke @reneschwietzke@foojay.social
· 8mo ago
Replying to
@cwebber@social.coop I agree. There is less public information for future training for anyone as well as similar code due to more AI written software also in the open space. I expect an input standstill until someone invents non-LLM AI for coding.
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Open post
René Schwietzke @reneschwietzke@foojay.social
· 10mo ago
Replying to
@slightlyoff @fugueish Because we can. Nobody cares if it works. Terrible attitude, I know.
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Open post
René Schwietzke @reneschwietzke@foojay.social
· 5mo ago

@otfrom@functional.cafe If the library states that, I am cool with it.

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Open post
René Schwietzke @reneschwietzke@foojay.social
· 5mo ago

Even if we would stop using AI for production coding, the fact alone that you can build great demos and prototypes to show people what could be done, is priceless. Just churning through ideas as a product owner without the need to first sell your blurry ideas to someone else to get those prototyped... Priceless.

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Open post
René Schwietzke @reneschwietzke@foojay.social
· 1mo ago

📢 JUG Saxony Treffen bei Xceptance in Jena: Softwarearchitektur im Team in Eigenregie bewerten

👉 183. Treffen der Java User Group Saxony
🗓️ Wann: Donnerstag, 10. September 2026, 18:00 Uhr
📍 Wo: Xceptance GmbH, Leutragraben 2-4, 07743 Jena
🗣️ Referent: Stefan Zörner (embarc Software Consulting GmbH)

Wir freuen uns auf Eure Teilnahme!

Mehr dazu und zur Anmeldung: https://jugsaxony.org/timeline/2026/9/10/LASR

jugsaxony.org
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Open post
René Schwietzke @reneschwietzke@foojay.social
· 3mo ago

Liebe deutsche Politik, ohne großen Wurf, der allen wehtut wird es nix. Wir brauchen eine flexiblen Arbeitsmarkt, weniger Steuern und weniger Steuerregelwerk, aber mehr Kontrolle.

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Open post
René Schwietzke @reneschwietzke@foojay.social
· 4mo ago

@jorge@social.jagedn.dev I also think that self-hosted models will become more popular with smaller companies and coders. Not the latest stuff, but good enough. The price war will start soon again and sooner or later the overall cost must drop for larger hosters as well to make it work.

Moving to their own chips is just the start.

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Open post
René Schwietzke @reneschwietzke@foojay.social
· 4mo ago

@otfrom@functional.cafe What is the destination?

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Open post
René Schwietzke @reneschwietzke@foojay.social
· 5mo ago
Replying to
@FrVaBe@mastodon.social 200 bucks a month for insane quick prototyping is almost priceless... 🤣
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Open post
René Schwietzke @reneschwietzke@foojay.social
· 8mo ago
Replying to
@ftranschel@norden.social @cwebber@social.coop Which most people and profit centers will happily do.
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Open post
René Schwietzke @reneschwietzke@foojay.social
· 8mo ago
Replying to
@ftranschel@norden.social @cwebber@social.coop But it is nice to control the monkeys of wonder...
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