From: Rich Felker <dalias@libc.org>
To: musl@lists.openwall.com
Subject: Re: New malloc - first preview
Date: Thu, 28 Nov 2019 17:22:11 -0500 [thread overview]
Message-ID: <20191128222211.GO16318@brightrain.aerifal.cx> (raw)
In-Reply-To: <20191128215642.GN16318@brightrain.aerifal.cx>
On Thu, Nov 28, 2019 at 04:56:42PM -0500, Rich Felker wrote:
> Work on the new malloc is well underway, and I have a draft version
> now public at:
>
> https://github.com/richfelker/mallocng-draft
>
> Some highlights:
>
> - Smallest size-class now has 12 of 16 bytes usable for storage,
> compared to 8 of 16 (32-bit archs) or 16 of 32 (64-bit archs) with
> the old malloc, plus 1.5 bytes (32-bit) or 2.5 bytes (64-bit) of
> out-of-band metadata. This overhead (5.5 or 6.5 bytes per
> allocation) is uniform across all sizes.
Make that 6 or 7 since there's also a 16-byte (counting alignment,
which is most of it) group header that imposes 0.5 bytes of overhead
per slot for a full-length 32-slot group.
Rich
next prev parent reply other threads:[~2019-11-28 22:22 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-22 17:40 New malloc - intro, motivation & design goals document Rich Felker
2019-11-06 3:46 ` Non-candidate allocator designs, things to learn from them Rich Felker
2019-11-06 10:06 ` Florian Weimer
2019-11-28 21:56 ` New malloc - first preview Rich Felker
2019-11-28 22:22 ` Rich Felker [this message]
2019-11-29 6:37 ` Vasya Boytsov
2019-11-29 13:55 ` Rich Felker
2019-11-30 5:54 ` Rich Felker
2019-11-29 16:41 ` Roman Yeryomin
2019-11-30 4:49 ` Rich Felker
2019-11-29 19:45 ` Markus Wichmann
2019-11-30 3:15 ` Rich Felker
2019-11-30 22:11 ` Rich Felker
2019-12-06 5:06 ` Rich Felker
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