From: Po Lu <luangruo@yahoo.com>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: "Tyler Dodge" <tyler@tdodge.consulting>,
"Stefan Kangas" <stefan@marxist.se>,
"Emacs developers" <emacs-devel@gnu.org>
Subject: Re: "Significant Garbage Collection Improvement For Emacs" - sweep_conses performance improved by 50%?
Date: Sun, 30 Oct 2022 08:53:12 +0800 [thread overview]
Message-ID: <87ilk2jfnr.fsf@yahoo.com> (raw)
In-Reply-To: <jwvy1syiupx.fsf-monnier+emacs@gnu.org> (Stefan Monnier's message of "Sat, 29 Oct 2022 10:32:39 -0400")
Stefan Monnier <monnier@iro.umontreal.ca> writes:
> Basically you're replacing 1kB blocks with 32kB blocks, which indeed
> seems very reasonable. Back when I introduced those blocks (and their
> associated bitmaps) I chose 1kB because I wanted something small enough
> that it couldn't be worse than what we had before, not because it was
> the best choice.
It may be worth nothing that I chose a cons and float block size of 4
times the page size while working with the incremental GC, which ends up
16k on most systems. However, there are also two pairs of markbits in
each block.
I haven't seen anything bad happen from that choice yet. But there,
BLOCK_ALIGN is gone in the first place, and it relies on valloc
returning suitably aligned memory.
next prev parent reply other threads:[~2022-10-30 0:53 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-29 5:07 "Significant Garbage Collection Improvement For Emacs" - sweep_conses performance improved by 50%? Stefan Kangas
2022-10-29 5:19 ` Christopher Dimech
2022-10-29 5:41 ` Po Lu
2022-10-29 6:07 ` Tyler Dodge
2022-10-29 14:32 ` Stefan Monnier
2022-10-30 0:53 ` Po Lu [this message]
2023-02-11 20:10 ` Ihor Radchenko
2023-02-12 21:58 ` Konstantin Kharlamov
2023-02-13 20:07 ` Konstantin Kharlamov
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