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Stefan Marr

@stefan-marr.de

Interpreters, compilation, concurrency, and debugging tools.

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11.11.2024
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Latest posts by Stefan Marr @stefan-marr.de

SCAM ALERT

seems to be a known one www.ecgi.global/scam-alert

06.03.2026 15:09 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Oh wow, someone is scraping researchr and sends "we'll organize your travel" spam. Ugh.

06.03.2026 15:07 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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ICOOOLPS 2026 - ECOOP 2026 The ICOOOLPS workshop series brings together researchers and practitioners working in the field of language implementation and optimization. The goal of the workshop is to discuss emerging problems an...

The deadline of the ICOOOLPS workshop is soon!

Want to talk about language implementation challenges, experiences, and/or research?

It will be in sunny Brussels end of June!

2026.ecoop.org/home/ICOOOLP...

05.03.2026 19:28 πŸ‘ 1 πŸ” 3 πŸ’¬ 0 πŸ“Œ 0
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ICOOOLPS 2026 - ECOOP 2026 The ICOOOLPS workshop series brings together researchers and practitioners working in the field of language implementation and optimization. The goal of the workshop is to discuss emerging problems an...

The deadline of the ICOOOLPS workshop is soon!

Want to talk about language implementation challenges, experiences, and/or research?

It will be in sunny Brussels end of June!

2026.ecoop.org/home/ICOOOLP...

05.03.2026 19:28 πŸ‘ 1 πŸ” 3 πŸ’¬ 0 πŸ“Œ 0
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A bit late and not yet finalized, but our program for MoreVMs'26 is online.

Early registration deadline is in a few hours, but will remain open afterwards still.

Join us in Munich for a day of talks around language implementation!

2026.programming-conference.org/home/MoreVMs...

20.02.2026 20:31 πŸ‘ 8 πŸ” 3 πŸ’¬ 0 πŸ“Œ 1
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A bit late and not yet finalized, but our program for MoreVMs'26 is online.

Early registration deadline is in a few hours, but will remain open afterwards still.

Join us in Munich for a day of talks around language implementation!

2026.programming-conference.org/home/MoreVMs...

20.02.2026 20:31 πŸ‘ 8 πŸ” 3 πŸ’¬ 0 πŸ“Œ 1
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β€ΉProgrammingβ€Ί 2026 The International Conference on the Art, Science, and Engineering of Programmingβ€”or β€ΉProgrammingβ€Ί for shortβ€”is a new conference focused on programming topics including the experience of programming. β€Ή...

Final 24h! Early bird for #prog26 ends tomorrow, Feb 20. Don't miss the art & science of programming in Munich (Mar 16–20)!

Register: 2026.programming-conference.org
Submit to the Substrates workshop: 2026.programming-conference.org/home/substra...

19.02.2026 12:34 πŸ‘ 2 πŸ” 2 πŸ’¬ 0 πŸ“Œ 0
ISMM 2026 - ISMM 2026 Welcome to the home page of the 2026 ACM SIGPLAN International Symposium on Memory Management (ISMM 2026)! ISMM is the premier forum dedicated to research in memory management, covering the areas of m...

ISMM (International Symposium on Memory Management) is going to hosted at PLDI'26. Please consider submitting your awesome papers on memory management by 27th March:
conf.researchr.org/home/ismm-20...

18.02.2026 19:41 πŸ‘ 1 πŸ” 2 πŸ’¬ 0 πŸ“Œ 0

Overheard some non-technical people:

"Oh, that's all AI, I wouldn't touch that."

It was about some finance scam app...

05.02.2026 10:31 πŸ‘ 3 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Programming Language Implementation: In Theory, We Understand. In Practice, We Wish We Would. My Inaugural Lecture at the JKU will be on March 9th, 2026

Programming Language Implementation: In Theory, We Understand. In Practice, We Wish We Would.

In about a month, on March 9th, I'll give my inaugural lecture.

I'll probably complain about the complexity of modern programming language implementations...

stefan-marr.de/2026/02/prog...

02.02.2026 20:46 πŸ‘ 21 πŸ” 4 πŸ’¬ 0 πŸ“Œ 0
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We are organizing the third edition of the "Fuzzing and Software Security Summer School 2026", at NUS on 26th–29th May 2026. We have a stellar set of speakers and will also have a Hackathon. Please share, and/or consider joining! fuzzingsummerschool.github.io/index.html

03.02.2026 08:03 πŸ‘ 10 πŸ” 4 πŸ’¬ 2 πŸ“Œ 0
Programming Language Implementation: In Theory, We Understand. In Practice, We Wish We Would. My Inaugural Lecture at the JKU will be on March 9th, 2026

Programming Language Implementation: In Theory, We Understand. In Practice, We Wish We Would.

In about a month, on March 9th, I'll give my inaugural lecture.

I'll probably complain about the complexity of modern programming language implementations...

stefan-marr.de/2026/02/prog...

02.02.2026 20:46 πŸ‘ 21 πŸ” 4 πŸ’¬ 0 πŸ“Œ 0
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Just passed by this fun mural www.cologne-tourism.com/arts-culture...

02.02.2026 14:52 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Python, Is It Being Killed by Incremental Improvements? Recent changes in Python, may cause issues in the long term.

Python, Is It Being Killed by Incremental Improvements?

In October, I gave a talk at SPLASH, which is now online.
Is the title click bait? Click the link below, watch the recording, and find out!

Spoiler: I think Python has a problem but we can do something about it.
stefan-marr.de/2026/01/pyth...

20.01.2026 14:10 πŸ‘ 3 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
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Python, Is It Being Killed by Incremental Improvements? Recent changes in Python, may cause issues in the long term.

Python, Is It Being Killed by Incremental Improvements?

In October, I gave a talk at SPLASH, which is now online.
Is the title click bait? Click the link below, watch the recording, and find out!

Spoiler: I think Python has a problem but we can do something about it.
stefan-marr.de/2026/01/pyth...

20.01.2026 14:10 πŸ‘ 3 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
The Z Garbage Collector | In JDK 25 | Erik Γ–sterlund | Taylor & Franci This book explains how the Z Garbage Collector was designed, why it was designed this way, the common pitfalls to avoid when using ZGC in JDK 25 and how to get

After working on ZGC for a decade, I’m happy to announce that I’m publishing a book about ZGC in JDK 25. It ships 22 May (www.taylorfrancis.com/books/mono/1...) and is being published by Taylor & Francis. You should get a copy if you want to learn more about ZGC. It’s available for pre-order now.

15.01.2026 16:57 πŸ‘ 31 πŸ” 9 πŸ’¬ 0 πŸ“Œ 2

Very cool research made it into TruffleRuby!

13.01.2026 21:39 πŸ‘ 5 πŸ” 2 πŸ’¬ 0 πŸ“Œ 0
Job Opportunity at Royal Holloway University of London: Postdoctoral Research Associate Full-Time, Fixed-Term until 30 November 2028Applications are invited for the post of Post Doctoral Research Associate (PDRA) in the Department of Computer Science at Royal Holloway.This is a three-year full-time position funded by the EPSRC project...

.@julien-lange.bsky.social and I are looking for a PostDoc to work on our EPSRC Project "INDIMO: Invariant Discovery and Monitoring for Message-Passing Programs".

If you know someone, or are interested, please reach out!

A few details here: jobs.royalholloway.ac.uk/Vacancy.aspx...

12.01.2026 11:58 πŸ‘ 2 πŸ” 4 πŸ’¬ 0 πŸ“Œ 0
Job Opportunity at Royal Holloway University of London: Postdoctoral Research Associate Full-Time, Fixed-Term until 30 November 2028Applications are invited for the post of Post Doctoral Research Associate (PDRA) in the Department of Computer Science at Royal Holloway.This is a three-year full-time position funded by the EPSRC project...

.@julien-lange.bsky.social and I are looking for a PostDoc to work on our EPSRC Project "INDIMO: Invariant Discovery and Monitoring for Message-Passing Programs".

If you know someone, or are interested, please reach out!

A few details here: jobs.royalholloway.ac.uk/Vacancy.aspx...

12.01.2026 11:58 πŸ‘ 2 πŸ” 4 πŸ’¬ 0 πŸ“Œ 0

I should probably add that this isn't a judgement, just an observation.

08.01.2026 21:58 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

I watched it. Not really what I imagined an inaugural lecture to be.

08.01.2026 21:56 πŸ‘ 0 πŸ” 0 πŸ’¬ 2 πŸ“Œ 0

Koichi gave a talk at VMIL about it: youtu.be/pqDMne677Ww?...
The code is at github.com/ko1/astro
naruby uses the Prism C API for parsing: github.com/ko1/astro/tr...

07.01.2026 13:52 πŸ‘ 1 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0

Last year I had the pleasure to review and contribute to this paper by @ko1s.bsky.social: atdot.net/~ko1/activit...
It's a tiny framework to partial evaluate AST interpreters written in C. The paper uses the example of a minimal subset of Ruby called naruby (Not A Ruby).

07.01.2026 13:52 πŸ‘ 4 πŸ” 1 πŸ’¬ 1 πŸ“Œ 0

More PLISS speakers announced! pliss.org/2026/

06.01.2026 09:17 πŸ‘ 10 πŸ” 2 πŸ’¬ 2 πŸ“Œ 0
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a black cat is using an apple laptop with the words deadline is coming written below it Alt: cat is typing furiously on a laptop

Had a good inspiring break?

Tell us about your latest ideas on language implementations, compilers, and VMs: 2026.programming-conference.org/home/MoreVMs...

Can be just a short abstract, or something slightly more technical if preferred.

Deadline in about a week, Jan 12th.

05.01.2026 16:56 πŸ‘ 3 πŸ” 3 πŸ’¬ 0 πŸ“Œ 0
Preview
a black cat is using an apple laptop with the words deadline is coming written below it Alt: cat is typing furiously on a laptop

Had a good inspiring break?

Tell us about your latest ideas on language implementations, compilers, and VMs: 2026.programming-conference.org/home/MoreVMs...

Can be just a short abstract, or something slightly more technical if preferred.

Deadline in about a week, Jan 12th.

05.01.2026 16:56 πŸ‘ 3 πŸ” 3 πŸ’¬ 0 πŸ“Œ 0

Yeah, I don't think auto resize gives great results either. I think I tried slapping a 100% width CSS on before and that felt worse. Especially on the phone where there is not a lot of horizontal space to start with.

30.12.2025 17:44 πŸ‘ 2 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

That seems to be images sticking out to the right, but if one doesn't want to compromise on image size, not sure how to avoid it.
Have the same issue with my blog.

30.12.2025 09:07 πŸ‘ 2 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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ZJIT is now available in Ruby 4.0 ZJIT is now available with the release of Ruby 4.0. Here’s an update of our progress.

ZJIT is available starting in Ruby 4.0! Please try it out on your test suite, maybe in a staging environment, and let us know how it goes!

railsatscale.com/2025-12-24-l...

24.12.2025 15:50 πŸ‘ 20 πŸ” 7 πŸ’¬ 2 πŸ“Œ 0

Last workday of the year for me. Down to 30 unread emails.

Let's see what the new year brings πŸ™ˆ

22.12.2025 18:31 πŸ‘ 4 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0