Gentoo Archives: gentoo-dev

From: "Michał Górny" <mgorny@g.o>
To: gentoo-dev@l.g.o
Cc: dberkholz@g.o
Subject: Re: [gentoo-dev] x32 fun pants
Date: Fri, 16 Sep 2011 14:04:54
Message-Id: 20110916160607.5126871a@pomiocik.lan
In Reply to: Re: [gentoo-dev] x32 fun pants by Donnie Berkholz
1 On Fri, 16 Sep 2011 08:36:32 -0500
2 Donnie Berkholz <dberkholz@g.o> wrote:
3
4 > On 15:34 Thu 15 Sep , Mike Frysinger wrote:
5 > > ive converted my system over to x86/amd64/x32 multilib for funs.
6 > > but i can see how some people wont want all three all the time. so
7 > > the question is how we want to make this available to users at the
8 > > release/profile level.
9 > >
10 > > background: x32 is a new ABI that runs on 64bit x86_64 processors.
11 > > see [1]. you'll need gcc-4.7+, binutils-2.21.50+, glibc-2.15+, and
12 > > linux-3.2+.
13 >
14 > For anyone interested how the performance compares to amd64 in more
15 > comprehensive tests, check out the slides from the Linux Plumbers
16 > Conference (particularly 14-21):
17 >
18 > http://linuxplumbersconf.org/2011/ocw/proposals/531
19 >
20 > In summary, on those benchmarks it looks like a small global win
21 > (maybe 5%) on integer calculations with a few huge wins of ≥25%, but
22 > a net loss around 5% pretty much globally for floating-point
23 > calculations.
24 >
25 > Most people probably do a lot more integer calculations unless
26 > they're science geeks like me, plus it should have lower memory use,
27 > so my understanding is that it probably makes sense to switch to x32
28 > no matter what you're using now (x86 or amd64).
29 >
30 > Mike, would you agree?
31
32 But doesn't switching mean we're going to hit LFS PITA once again?
33
34 --
35 Best regards,
36 Michał Górny

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Re: [gentoo-dev] x32 fun pants Mike Frysinger <vapier@g.o>