Date: Thu, 28 Nov 2019 17:22:11 -0500 From: Rich Felker <dalias@...c.org> To: musl@...ts.openwall.com Subject: Re: New malloc - first preview 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
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