Stefan Marr

Full Professor (Universitätsprofessor)

Stefan Marr I head the Institute for System Software at the Johannes Kepler University Linz. My work focuses on programming language implementation techniques, compilation, complex concurrent systems, and tooling.

I am personally interested in making interpreters faster, detecting and preventing concurrency bugs at run time, and use modern language runtime systems to provide programmers with better tooling.

For contact details, please see my staff page.

Archive of posts from January 2026

Jan 20, 2026: Python, Is It Being Killed by Incremental Improvements?

Over the past years, two major players invested into the future of Python. Microsoft’s Faster CPython team has pushed ahead with impressive performance improvements for the CPython interpreter, which has gotten at least 2x faster since Python 3.9. They also have a baseline JIT compiler for CPython, too. At the same time, Meta is worked hard on making free-threaded Python a reality to bring classic shared-memory multithreading to Python, without being limited by the still standard Global Interpreter Lock, which prevents true parallelism.