From: Joe Perches <joe@perches.com>
To: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: linux-kernel@vger.kernel.org,
"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 08:03:33 -0800 [thread overview]
Message-ID: <1425571413.31859.1.camel@perches.com> (raw)
In-Reply-To: <87r3t3eafm.fsf@rasmusvillemoes.dk>
On Thu, 2015-03-05 at 16:22 +0100, Rasmus Villemoes wrote:
> 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.
Dunno why you assume that, sometimes it just takes
awhile for people to look at non-critical, infrequent
optimization changes like this.
Seems sensible enough to me though.
next prev parent reply other threads:[~2015-03-05 16:03 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-20 23:51 [RFC] lib/vsprintf.c: Even faster decimal conversion Rasmus Villemoes
2015-03-05 15:22 ` Rasmus Villemoes
2015-03-05 16:03 ` Joe Perches [this message]
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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