Re: Linux v.s. Mac OS-X Performance

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On Mon, 12 Nov 2007 10:47:29 -0700
Steve Wampler <swampler(at)noao(dot)edu> wrote:

> Sam Mason wrote:
> > And what's the performance hit of using native 64bit code? I'd
> > guess similar, moving twice as much data around with each pointer
> > has got to affect things.
>
> That's probably difficult to predict. Since the architecture is
> 64-bits, it shouldn't cost any more to move a 64-bit pointer around
> as a 32-bit one. (Plus, I *think* you get more registers in 64-bit
> mode.)

It's all about the registers man... all extra 8 of them. Unless of
course you are running with >8GB of ram, then it is all about the
ability to use more than 2GB of shared memory.

Joshua D. Drake

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