From: Rasmus Villemoes <linux@rasmusvillemoes.dk>
To: linux-kernel@vger.kernel.org
Cc: "Peter Zijlstra \(Intel\)" <peterz@infradead.org>,
Tejun Heo <tj@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [RFC] lib/vsprintf.c: Even faster decimal conversion
Date: Thu, 05 Mar 2015 16:22:21 +0100 [thread overview]
Message-ID: <87r3t3eafm.fsf@rasmusvillemoes.dk> (raw)
In-Reply-To: <1424476281-26873-1-git-send-email-linux@rasmusvillemoes.dk> (Rasmus Villemoes's message of "Sat, 21 Feb 2015 00:51:20 +0100")
On Sat, Feb 21 2015, Rasmus Villemoes <linux@rasmusvillemoes.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
next prev parent reply other threads:[~2015-03-05 15:22 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-20 23:51 Rasmus Villemoes
2015-03-05 15:22 ` Rasmus Villemoes [this message]
2015-03-05 16:03 ` Joe Perches
2015-03-05 16:10 ` Tejun Heo
2015-03-05 22:24 ` Rasmus Villemoes
2015-03-10 10:47 ` Rasmus Villemoes
2015-03-10 12:42 ` Tejun Heo
2015-03-10 12:57 ` Rasmus Villemoes
2015-03-10 23:01 ` [PATCH v1] " Rasmus Villemoes
2015-03-11 21:52 ` Andrew Morton
2015-03-19 21:41 ` Rasmus Villemoes
2015-03-12 18:49 ` Jeff Epler
2015-03-13 0:08 ` Jeff Epler
2015-03-13 0:30 ` Jeff Epler
2015-03-13 8:58 ` [PATCH] lib/vsprintf.c: silence sparse warnings about decpair[] initialization Rasmus Villemoes
2015-03-19 21:44 ` [PATCH] lib/vsprintf.c: improve put_dec_trunc8 slightly Rasmus Villemoes
2015-03-18 0:50 ` [RFC] lib/vsprintf.c: Even faster decimal conversion Denys Vlasenko
2015-03-18 0:52 ` Denys Vlasenko
2015-03-18 17:10 ` Rasmus Villemoes
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