To be clear, Sam’s basic approach is a bit slower for single-threaded code, and he admits that. But to sweeten the pot he has also applied a bunch of unrelated speedups that make it faster in general, so that overall it’s always a win. But presumably we could upstream the latter easily, separately from the GIL-freeing part.
On Fri, Oct 8, 2021 at 07:42 Łukasz Langa <luk...@langa.pl> wrote: > > > On 8 Oct 2021, at 10:13, Steven D'Aprano <st...@pearwood.info> wrote: > > > > Hi Sam, > > > > On Thu, Oct 07, 2021 at 03:52:56PM -0400, Sam Gross wrote: > > > >> I've been working on changes to CPython to allow it to run without the > >> global interpreter lock. I'd like to share a working proof-of-concept > that > >> can run without the GIL. > > > > Getting Python to run without the GIL has never been a major problem for > > CPython (and of course some other Python interpreters don't have a GIL > > at all). > > On the first page of Sam's design overview he references Gilectomy by name. > > > Single threaded code is still, and always will be, an important part of > > Python's ecosystem. A lot of people would be annoyed if the cost of > > speeding up heavily threaded Python by a small percentage would be to > > slow down single-threaded Python by a large percentage. > > Quoting that same design document, Sam writes: "The new interpreter > (together with the GIL changes) is about 10% faster than CPython 3.9 > on the single-threaded pyperformance benchmarks." > > - Ł > _______________________________________________ > Python-Dev mailing list -- python-dev@python.org > To unsubscribe send an email to python-dev-le...@python.org > https://mail.python.org/mailman3/lists/python-dev.python.org/ > Message archived at > https://mail.python.org/archives/list/python-dev@python.org/message/JO7OQCHZKIFNKSXTTXT2JBCF5H47M7OO/ > Code of Conduct: http://python.org/psf/codeofconduct/ > -- --Guido (mobile)
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