Other articles


  1. Work on Python buildbots, 2017 Q2

    I spent the last 6 months on working on buildbots: reduce the failure rate, send email notitication on failure, fix random bugs, detect more bugs using warnings, backport fixes to older branches, etc. I decided to fix all buildbots issues: fix all warnings and all unstable tests!

    The good news ...

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  2. New Python test.bisect tool

    This article tells the story of the new CPython test.bisect tool to identify failing tests in the CPython test suite.

    Modify manually a test file

    I am fixing reference leaks since many years. When the test file contains more than 200 tests and is longer than 5,000 lines ...

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  3. My contributions to CPython during 2017 Q1

    My contributions to CPython during 2017 Q1 (january, februrary, march):

    • Statistics
    • Optimization
    • Tricky bug
    • FASTCALL optimizations
    • Stack consumption
    • Contributions
    • os.urandom() and getrandom()
    • Migration to GitHub
    • Enhancements
    • Security
    • regrtest
    • Bugfixes

    Previous report: My contributions to CPython during 2016 Q4.

    Statistics

    # All commits
    $ git log --after=2016-12-31 --before=2017-04-01 --reverse --branches ...
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  4. FASTCALL issues

    Here is the raw list of the 46 CPython issues I opended between 2016-04-21 and 2017-02-10 to implement my FASTCALL optimization. Most issues created in 2016 are already part of Python 3.6.0, some are already merged into the future Python 3.7, the few remaining issues are still ...

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  5. FASTCALL microbenchmarks

    For my FASTCALL project (CPython optimization avoiding temporary tuples and dictionaries to pass arguments), I wrote many short microbenchmarks. I grouped them into a new Git repository: pymicrobench. Benchmark results are required by CPython developers to prove that an optimization is worth it. It's not uncommon that I abandon ...

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  6. The start of the FASTCALL project

    False start

    In April 2016, I experimented a Python change to avoid temporary tuple to call functions. Builtin functions were between 20 and 50% faster!

    Sadly, some benchmarks were randomy slower. It will take me four months to understand why!

    Work on benchmarks

    During four months, I worked on making ...

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