On Fri, 16 Sep 2011 08:36:32 -0500 Donnie Berkholz <dberkh...@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
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