[GRLUG] 64-bit Linux

[Professor Inuyasha]

Actually I know what is different between 32bit and 64bit

64bit is better than 32bit

Reason:

RAM SIZE LIMIT
32bit = 3.25GB / 4GB
64bit = 16EB (exabyte)
and, 128bit = 274,877,906,944 YB (yottabyte)

Apps:
company are developing 32bit software into 64bit
otherwise, we're still using 32bit software on 64bit operation system
but there is some 64bit software too


P.S. I'm wondering why people love send message under people's message?

On Fri, May 9, 2008 at 2:43 PM, Michael Mol <mikemol at gmail.com> wrote:
> On Fri, May 9, 2008 at 2:31 PM, Collin <adderd at kkmfg.com> wrote:
>>>
>>>
>>> Any x86-64 processor should have Intel's Paged Address Extensions,
>>> giving 32-bit operating systems access to up to (IIRC) 64GB of RAM.  I
>>> know it's possible on Linux, at the very least. See the "64GB high
>>> memory" option if you configure and compile your own kernel.
>>>
>>> I like x86-64 primarily because of the 8 GPRs that the compiler can
>>> optimize for, instead of 4 GPRs on IA32.  I've done enough performance
>>> coding to recognize how useful it can be to have that many more places
>>> to store values and pointers, and avoid needing to call out to cache.
>>>
>>>
>>
>> That's true. PAE has been available on a lot of intel processors for
>> some time now. But, quite frankly, it sucks. The processor can't
>> physically access all of that memory in one shot so you end with a lot
>> of wrangling in page tables. It slows down the system performance. If
>> you are going to slow down the performance anyway then you may as well
>> go to 64 bit where sometimes it might actually be faster instead of slower.
>
> Hey, at least PAE (paging to RAM) was faster than virtual memory
> (paging to disk). :-)
>
> --
> :wq
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-- 
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Professor Inuyasha