Subj : [$] Python, tail calls, and performance
To   : All
From : LWN.net
Date : Wed Aug 20 2025 16:00:08

[$] Python, tail calls, and performance

Date:
Wed, 20 Aug 2025 14:45:14 +0000

Description:
Ken Jin welcomed EuroPython2025 attendees to
his talk entitled "Building a new tail-calling interpreter for Python", but
noted that the title really should be: "Measuring the performance of
compilers and interpreters is really hard".  Jin's efforts to switch the 
CPython interpreter to use tail calls ,
which can be optimized as regular jumps,
initially seemed to produce an almost miraculous performance improvement.
As his modified title suggests, the actual improvement
was rather smaller ; there is still some performance improvement and
there are other benefits from the change.

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Link to news story:
https://lwn.net/Articles/1033373/


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