From: Stefan Monnier <monnier@IRO.UMontreal.CA>
To: 32405@debbugs.gnu.org
Subject: bug#32405: Turning misc objects into pseudovectors
Date: Wed, 08 Aug 2018 23:58:10 -0400 [thread overview]
Message-ID: <jwva7pw9p07.fsf-monnier+gmane.emacs.devel@gnu.org> (raw)
In-Reply-To: <988905f1-fb41-9559-300d-d015bda4b791@cs.ucla.edu> (Paul Eggert's message of "Wed, 8 Aug 2018 20:07:30 -0700")
> Bug#32405 contains a patch that will get rid of the miscellaneous-object
> category of the Emacs Lisp interpreter, and will change these objects to be
> pseudovectors instead. The motivation is to simplify the interpreter and
> garbage collector and speed it up slightly, and to simplify potential
> future changes.
I like the idea, but:
AFAIK the main issue with pseudovectors is that their allocation is
slower and suffers more from fragmentation (because we don't use
a size-segregated allocation algorithm (like Linux's SLAB, for example)
for them).
Are you sure the new code is faster overall?
There is also a potential issue in terms of the resulting heap size of
markers (which may bump up from 6 words to 8 words, IIRC, unless your
patch does something to keep it down to 6), tho this is probably of no
real consequence.
Stefan
next parent reply other threads:[~2018-08-09 3:58 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <988905f1-fb41-9559-300d-d015bda4b791@cs.ucla.edu>
2018-08-09 3:58 ` Stefan Monnier [this message]
2018-08-09 16:31 ` bug#32405: Turning misc objects into pseudovectors Tom Tromey
[not found] ` <8736vn8pso.fsf@tromey.com>
2018-08-09 17:22 ` Paul Eggert
2018-08-09 18:27 ` Eli Zaretskii
[not found] ` <83o9ebo0or.fsf@gnu.org>
2018-08-10 13:43 ` Tom Tromey
[not found] ` <87o9ea5od7.fsf@tromey.com>
2018-08-12 1:53 ` Paul Eggert
[not found] ` <ce9022a7-c1cf-4969-d769-2d2c33a1f2af@cs.ucla.edu>
2018-08-14 19:11 ` Paul Eggert
2018-08-09 2:58 bug#32405: [PATCH] Turn " Paul Eggert
2018-08-09 5:01 ` bug#32405: Turning " Paul Eggert
2018-08-09 7:16 ` Paul Eggert
2018-08-09 16:24 ` Stefan Monnier
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