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Date: Thu, 28 Nov 2019 17:22:11 -0500
From: Rich Felker <>
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:
> 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.


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