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Message-ID: <20200410172152.GS11469@brightrain.aerifal.cx>
Date: Fri, 10 Apr 2020 13:21:52 -0400
From: Rich Felker <dalias@...c.org>
To: musl@...ts.openwall.com
Subject: Re: Concrete case-by-case examples of mallocng @ low usage
On Fri, Apr 10, 2020 at 01:04:07PM -0400, Rich Felker wrote:
> The following are tables of initial allocation behavior for all sizes
> up through 16k assuming 4k page size. The fine classing figures won't
> actually be used for initial allocations, but I've included them for
> comparison to illustrate why coarse classes are used. These numbers
> were all done by hand independently of the code, so that if actual
> behavior differs, it indicates a bug in one or the other.
>
>
> First 16 size classes, no coarse classing:
>
> 0-12: 2x2032 -> 2x1008 -> 2x496 -> 30x16
> 13-28: 2x2032 -> 2x1008 -> 2x496 -> 15x32
> 29-44: 2x2032 -> 2x1008 -> 2x496 -> 10x48
> 45-60: 2x2032 -> 2x1008 -> 2x496 -> 7x64
> 61-76: 2x2032 -> 2x1008 -> 2x496 -> 6x80
> 77-92: 2x2032 -> 2x1008 -> 2x496 -> 5x96
> 93-108: 2x2032 -> 2x1008 -> 2x496 -> 4x112
> 109-124: 2x2032 -> 2x1008 -> 7x128
>
> 125-140: 2x2032 -> 2x1008 -> 7x144
> 141-156: 2x2032 -> 2x1008 -> 2x496 -> 3x160
> 157-188: 2x2032 -> 2x1008 -> 5x192
> 189-236: 2x2032 -> 2x1008 -> 2x496 -> 2x240
>
> 237-272: 2x2032 -> 7x288
> 273-332: 2x2032 -> 2x1008 -> 3x336
These should read:
237-284: 2x2032 -> 7x288
285-332: 2x2032 -> 2x1008 -> 3x336
Not sure why I can't subtract 288-4...
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