linux-kernel - Re: [RFC] lib/vsprintf.c: Even faster decimal conversion

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Date:	Thu, 05 Mar 2015 16:22:21 +0100
From:	Rasmus Villemoes <linux@...musvillemoes.dk>
To:	linux-kernel@...r.kernel.org
Cc:	"Peter Zijlstra \(Intel\)" <peterz@...radead.org>,
	Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC] lib/vsprintf.c: Even faster decimal conversion

On Sat, Feb 21 2015, Rasmus Villemoes <linux@...musvillemoes.dk> wrote:

> [...] decimal conversion [...] it does indeed seem like there is
> something to be gained, especially on 64 bits.
>
> $ ./test64
> Distribution              Function         Cycles/conv  Conv/1 sec
> uniform([10, 2^64-1])     linux_put_dec          127.72         23047567
> uniform([10, 2^64-1])     rv_put_dec              60.73         45932786
>                           +/-                   -52.45%          +99.30%
[...]
> 3 + neg_binom(0.50)       linux_put_dec           16.85        159560933
> 3 + neg_binom(0.50)       rv_put_dec              12.59        204607570
>                           +/-                   -25.31%          +28.23%

I'm assuming the underwhelming response means NAK.

Rasmus
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