Re: [gentoo-dev] x32 fun pants

["Michał Górny" <mgorny@gentoo.org>]

[-- Attachment #1: Type: text/plain, Size: 1417 bytes --]

On Fri, 16 Sep 2011 08:36:32 -0500
Donnie Berkholz <dberkholz@gentoo.org> wrote:

> On 15:34 Thu 15 Sep     , Mike Frysinger wrote:
> > ive converted my system over to x86/amd64/x32 multilib for funs.
> > but i can see how some people wont want all three all the time.  so
> > the question is how we want to make this available to users at the
> > release/profile level.
> > 
> > background: x32 is a new ABI that runs on 64bit x86_64 processors.
> > see [1]. you'll need gcc-4.7+, binutils-2.21.50+, glibc-2.15+, and
> > linux-3.2+.
> 
> For anyone interested how the performance compares to amd64 in more 
> comprehensive tests, check out the slides from the Linux Plumbers 
> Conference (particularly 14-21):
> 
> http://linuxplumbersconf.org/2011/ocw/proposals/531
> 
> In summary, on those benchmarks it looks like a small global win
> (maybe 5%) on integer calculations with a few huge wins of ≥25%, but
> a net loss around 5% pretty much globally for floating-point
> calculations.
> 
> Most people probably do a lot more integer calculations unless
> they're science geeks like me, plus it should have lower memory use,
> so my understanding is that it probably makes sense to switch to x32
> no matter what you're using now (x86 or amd64).
> 
> Mike, would you agree?

But doesn't switching mean we're going to hit LFS PITA once again?

-- 
Best regards,
Michał Górny

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 316 bytes --]