Python 3.15's Tail-Calling Interpreter Shows 15% Performance Gain on Windows x86-64
By
lumpa
Hand-rolled, kettle-boiled, baked to perfection. Worth every minute at the bakery.
Summary
The article discusses performance improvements in Python 3.15's interpreter, specifically highlighting that the tail-calling interpreter shows significant speed gains over the computed goto interpreter on certain platforms. The author partially retracts a previous apology about performance results, noting that on macOS AArch64 (XCode Clang) the tail-calling interpreter is 5% faster, and on Windows x86-64 (MSVC) it's approximately 15% faster based on pyperformance benchmarks.
Key quotes
· 3 pulledI can proudly say today that I am partially retracting that apology, but only for two platforms—macOS AArch64 (XCode Clang) and Windows x86-64 (MSVC).
In our own experiments, the tail calling interpreter for CPython was found to beat the computed goto interpreter by 5% on pyperformance on AArch64 macOS using XCode Clang, and roughly 15% on pyperformance on Windows x86-64 (MSVC).
Some time ago I posted an apology piece for Python’s tail calling results. I apologized for communicating performance results without noticing a compiler bug had occured.
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