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From: Ihor Radchenko <yantar92@HIDDEN>
Date: Sun, 14 Aug 2022 12:18:52 +0800
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Hi,

The known blocker of Elisp support of multi-threading is shared Elisp
machine state. Handling competing access to global Elisp variables is
tricky. However, it is not the case for pure side-effect-free functions.

Consider the following code:

(let (long-list-of-cons)
  (dotimes (i 100000)
    (push (cons i (1+ i)) long-list-of-cons))
  (mapcar #'car long-list-of-cons))

The last mapcar looks like a good candidate to run on multiple CPUs.
I imagine that instead of applying #'car sequentially, Elisp can split
the list in chunks and run them independently on multiple CPUs. This
operation is still blocking and thus will not create issues with shared
access. At the same time such mapcar call will finish much faster.

Would something like this be feasible to implement in Elisp?

-- 
Ihor Radchenko,
Org mode contributor,
Learn more about Org mode at https://orgmode.org/.
Support Org development at https://liberapay.com/org-mode,
or support my work at https://liberapay.com/yantar92




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To: Ihor Radchenko <yantar92@HIDDEN>
Subject: bug#57197: Acknowledgement (28.1.90; Can pure side-effect-free
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Subject: bug#57197: 28.1.90; Can pure side-effect-free functions use multiple CPUs in Elisp?
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> Hi,
>=20
> The known blocker of Elisp support of multi-threading is shared Elisp
> machine state. Handling competing access to global Elisp variables is
> tricky. However, it is not the case for pure side-effect-free functions.
>=20
> Consider the following code:
>=20
> (let (long-list-of-cons)
>   (dotimes (i 100000)
>     (push (cons i (1+ i)) long-list-of-cons))
>   (mapcar #'car long-list-of-cons))
>=20
> The last mapcar looks like a good candidate to run on multiple CPUs.
> I imagine that instead of applying #'car sequentially, Elisp can split
> the list in chunks and run them independently on multiple CPUs. This
> operation is still blocking and thus will not create issues with shared
> access. At the same time such mapcar call will finish much faster.
>=20
> Would something like this be feasible to implement in Elisp?
>=20
> --=20
> Ihor Radchenko,
> Org mode contributor,
> Learn more about Org mode at https://orgmode.org/.
> Support Org development at https://liberapay.com/org-mode,
> or support my work at https://liberapay.com/yantar92
>

I think the problem is the interpreter itself, which is not thread-safe.
This looks like a feature request, I think emacs-devel is good for that.

=2D-=20
Akib Azmain Turja

Find me on Mastodon at @akib@HIDDEN

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 Content preview:  Akib Azmain Turja <akib@HIDDEN> writes: > I think the
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Akib Azmain Turja <akib@HIDDEN> writes:

> I think the problem is the interpreter itself, which is not thread-safe.

Yes, the interpreter (byte-code or not) itself is not thread-safe, so I
don't think it's feasible to do anything here without a serious rewrite
of that.






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