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Python Language Summit: Coverage by LWN

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  • The 2018 Python Language Summit

    Over the past three years, LWN and its readers have gotten a yearly treat in the form of coverage of the Python Language Summit; this year is no exception. The summit is a yearly gathering of around 40 or 50 developers from CPython, other Python implementations, and related projects. It is held on the first day of PyCon, which is two days before the main PyCon talk tracks begin. This year, the summit was held on May 9 in Cleveland, Ohio.

  • A Gilectomy update

    In a rather short session at the 2018 Python Language Summit, Larry Hastings updated attendees on the status of his Gilectomy project. The aim of that effort is to remove the global interpreter lock (GIL) from CPython. Since his status report at last year's summit, little has happened, which is part of why the session was so short. He hasn't given up on the overall idea, but it needs a new approach.

    Gilectomy has been "untouched for a year", Hastings said. He worked on it at the PyCon sprints after last year's summit, but got tired of it at that point. He is "out of bullets" at least with that approach. With his complicated buffered-reference-count approach he was able to get his "gilectomized" interpreter to reach performance parity with CPython—except that his interpreter was running on around seven cores to keep up with CPython on one.

  • Modifying the Python object model

    At the 2018 Python Language Summit, Carl Shapiro described some of the experiments that he and others at Instagram did to look at ways to improve the performance of the CPython interpreter. The talk was somewhat academic in tone and built on what has been learned in other dynamic languages over the years. By modifying the Python object model fairly substantially, they were able to roughly double the performance of the "classic" Richards benchmark.

    Shapiro said that Instagram is a big user of Python and has been looking for ways to improve the performance of the CPython interpreter for its workloads. So the company started looking at the representation of data in the interpreter to see if there were gains to be made there. It wanted to stick with CPython in order to preserve the existing API, ecosystem, and developer experience

  • Subinterpreter support for Python

    Eric Snow kicked off the 2018 edition of the Python Language Summit with a look at getting a better story for multicore Python by way of subinterpreters. Back in 2015, we looked at his efforts at that point; things have been progressing since. There is more to do, of course, so he is hoping to attract more developers to work on the project.

    Snow has been a core developer since 2012 and has "seen some interesting stuff" over that time. He has been working on the subinterpreters scheme for four years or so.

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