Re: 64bit vs i386
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On 05/14/08 00:37, CaT wrote:
> On Wed, May 14, 2008 at 12:31:40AM -0500, Ron Johnson wrote:
>> On 05/13/08 22:15, Todd A. Jacobs wrote:
>>> On Tue, May 13, 2008 at 09:45:48AM -0700, Abraham Chaffin wrote:
>>>
>>>> wondering if it makes a difference if I install the 64bit version of
>>>> the debian vs the i386 version of debian? If it's just running apache,
>>> You will pay a performance penalty if you run 32-bit on a 64-bit system.
>> How so? (That's the polite way of saying, "You're wrong.")
>
> Less registers for one -> more expensive accessess of variables and
Grandparent said "if you run 32-bit on a 64-bit system". And that's
just not true. There's only a *benefit* by running 64-bit code,
because of the extra registers.
If, though, he had said, "performance hit by compiling source code
in 32-bit mode versus 64-bit mode", I conditionally agree with you.
The problem is that the larger code size would have reduced cache
performance, negating some (or all) of the benefits from the extra
registers.
> other data. How much of a hit that makes depends on the s/w run but I'd
> say it's a safe bet that most if not all things will go a tad faster.
>
>>> You may also not be able to access all your RAM,
>> Sure, on the 80486 or early Pentia. But everything since then has PAE.
>
> With a performance hit. :)
You conveniently snipped the part where I agreed with the RAM
performance hit.
- --
Ron Johnson, Jr.
Jefferson LA USA
We want... a Shrubbery!!
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