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PyPy v7.3.23 release

https://www.pypy.org/posts/2026/05/pypy-v7322-release.html

Published: May 27, 2026 10:00

PyPy v7.3.23: release of python 2.7, 3.11 The PyPy team is proud to release version 7.3.23 of PyPy after the previous release on April 26, 2026. This is a bug-fix release that fixes an overeager warning about unused coroutines, and some problems around…

PyPy v7.3.22 release

https://www.pypy.org/posts/2026/04/pypy-v7322-release.html

Published: April 28, 2026 10:00

PyPy v7.3.22: release of python 2.7, 3.11 The PyPy team is proud to release version 7.3.22 of PyPy after the previous release on March 13, 2026. This is a bug-fix release that fixes several issues in the JIT. Among them, a long-standing JIT bug that…

Using Claude to fix PyPy3.11 test failures securely

https://www.pypy.org/posts/2026/03/using-claude-to-fix-pypy311-test-failures-securely.html

Published: March 23, 2026 10:27

I got access to Claude Max for 6 months, as a promotional move Anthropic made to Open Source Software contributors. My main OSS impact is as a maintainer for NumPy, but I decided to see what claude-code could to for PyPy's failing 3.11 tests. Most of these…

PyPy v7.3.21 release

https://www.pypy.org/posts/2026/03/pypy-v7320-release.html

Published: March 13, 2026 10:00

PyPy v7.3.21: release of python 2.7, 3.11 The PyPy team is proud to release version 7.3.21 of PyPy after the previous release on July 4, 2025. This is a bug-fix release that also updates to Python 3.11.15. The release includes two different interpreters: …

Load and store forwarding in the Toy Optimizer

https://www.pypy.org/posts/2025/12/toy-load-store.html

Published: December 24, 2025 23:00

This is a cross-post from Max Bernstein from his blog where he writes about programming languages, compilers, optimizations, virtual machines. A long, long time ago (two years!) CF Bolz-Tereick and I made a video about load/store forwarding and an…

PyPy v7.3.20 release

https://www.pypy.org/posts/2025/07/pypy-v7320-release.html

Published: July 4, 2025 12:00

PyPy v7.3.20: release of python 2.7, 3.11 The PyPy team is proud to release version 7.3.20 of PyPy after the previous release on Feb 26, 2025. The release fixes some subtle bugs in ctypes and OrderedDict and makes PyPy3.11 compatible with an upcoming…

How fast can the RPython GC allocate?

https://www.pypy.org/posts/2025/06/rpython-gc-allocation-speed.html

Published: June 15, 2025 13:48

While working on a paper about allocation profiling in VMProf I got curious about how quickly the RPython GC can allocate an object. I wrote a small RPython benchmark program to get an idea of the order of magnitude. The basic idea is to just allocate an…

Doing the Prospero-Challenge in RPython

https://www.pypy.org/posts/2025/04/prospero-in-rpython.html

Published: April 9, 2025 15:07

Recently I had a lot of fun playing with the Prospero Challenge by Matt Keeter. The challenge is to render a 1024x1024 image of a quote from The Tempest by Shakespeare. The input is a mathematical formula with 7866 operations, which is evaluated once per…

PyPy v7.3.19 release

https://www.pypy.org/posts/2025/02/pypy-v7319-release.html

Published: February 26, 2025 12:00

PyPy v7.3.19: release of python 2.7, 3.10 and 3.11 beta The PyPy team is proud to release version 7.3.19 of PyPy. This is primarily a bug-fix release fixing JIT-related problems and follows quickly on the heels of the previous release on Feb 6, 2025. This…

Low Overhead Allocation Sampling with VMProf in PyPy's GC

https://www.pypy.org/posts/2025/02/pypy-gc-sampling.html

Published: February 25, 2025 10:16

Introduction There are many time-based statistical profilers around (like VMProf or py-spy just to name a few). They allow the user to pick a trade-off between profiling precision and runtime overhead. On the other hand there are memory profilers such as…