Hm, I remember Greg's free threading too, but that's not the idea I was trying to recall this time. There really was something about bytecode objects being loaded from a read-only segment to speed up code loading. (Much quicker than unmarshalling a .pyc file.) I don't think we ever got the details worked out to the point where we could benchmark.
On Sat, Jun 20, 2020 at 4:57 AM Jonathan Fine <jfine2...@gmail.com> wrote: > Hi All > > Guido wrote: > > I remember vaguely that about two decades ago Greg Stein hatched an idea >> for code objects loaded from a read-only segment in shared libraries. >> > > [Thank you for this, Guido. Your memory is good.] > > Here's a thread from 2009, where Guido said: Greg Stein reached this same > conclusion (and similar numbers) over 10 years ago ... > > Subject: Remove GIL with CAS instructions? > > https://mail.python.org/archives/list/python-ideas@python.org/thread/6ZONFLMGCFP66AOMAFHY7ZB2VH3MUCM4/#XV3GBWJEYP7UAVSZXWRXABR7BVQMEKS2 > > I looked up https://en.wikipedia.org/wiki/Compare-and-swap to read about > CAS. > > Guido said this in the context of Antione's statement: Which makes me > agree with the commonly expressed opinion that CPython would probably need > to ditch refcounting (at least in the critical paths) if we want to remove > the GIL. > > In 2007 Guido posted to Artima: It isn't Easy to Remove the GIL: > https://www.artima.com/weblogs/viewpost.jsp?thread=214235 > > In this post Guido writes: In 1999 Greg Stein (with Mark Hammond?) > produced a fork of Python (1.5 I believe) that removed the GIL, replacing > it with fine-grained locks on all mutable data structures. [...] However, > after benchmarking, it was shown that even on the platform with the fastest > locking primitive (Windows at the time) it slowed down single-threaded > execution nearly two-fold. > > Guido also referenced this write-up from Greg: > https://mail.python.org/pipermail/python-dev/2001-August/017099.html > > I hope this helps. > > -- > Jonathan > > >> -- --Guido van Rossum (python.org/~guido) *Pronouns: he/him **(why is my pronoun here?)* <http://feministing.com/2015/02/03/how-using-they-as-a-singular-pronoun-can-change-the-world/>
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