June 17, 2021
7:59 a.m.
On Thu, Jun 17, 2021 at 10:50 AM Chris Angelico <rosuav@gmail.com> wrote:
> On Fri, Jun 18, 2021 at 12:43 AM Wes Turner <wes.turner@gmail.com> wrote:
> >
> > > What would be the advantage of such a declaration?
> >
> > Constants don't need to be locked or unlocked; which is advantageous for
> parallelism and reasoning about program correctness.
> > True consts (wherein everything referred to in that object is 'frozen'
> and immutable or at least only modifiable with e.g. copy-on-write)
> > wouldn't require locks,
> > which would be post-GIL advantageous.
> >
>
> That only works if you have a garbage collector that doesn't depend on
> reference counts (as CPython's does). Otherwise, you still need to
> modify the object, in a trivial sense, every time a reference is added
> or removed.
>
- https://pythoncapi.readthedocs.io/gilectomy.html
> Gilectomy is Larry Hastings’s project to attempt to remove the GIL from
CPython. It a fork on CPython which uses lock per object rather than using
a Global Interpreter Lock (GIL).
- https://lwn.net/Articles/754577/ Update re: Gilectomy
- There's probably a doc somewhere listing all of the post-GIL works?
(Consts could be a helpful performance optimization for like all of the
approaches I've seen)
- https://lwn.net/Articles/754162/ Subinterpreters PEP
> The PEP provides for a shared-nothing concurrency model. It has a
minimal Python API in an interpreters module. It also adds channels to pass
immutable objects between interpreters. A subinterpreter will retain its
state, so the interpreter can be "primed" with modules and other setup in
advance of its use.
https://www.python.org/dev/peps/pep-0554/#a-disclaimer-about-the-gil
https://distributed.dask.org/en/latest/memory.html#clearing-data
>
> ChrisA
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