Re: 32bit or 64bit?

["Wojciech Ziniewicz" <wojciech.ziniewicz@gmail.com>]

2008/5/6 Marc Schiffbauer <marc@schiffbauer.net>:

> For mysql it *might* be worth. How much RAM do these machines have?
> If its less than 4GB its not worth upgrading. IMO its even better to
> use x86 for those systems.
>

64bit processors are very very very rarely faster than 32bit processors.

moreover - depending whath application you run (based on processes or
threads etc..) it may affect how much RAM does your app take.
generally you have to have up to 30% ram more when running 64bit apps
on 64bit machine.

take a look here : http://www.phoronix.com/scan.php?page=article&item=616&num=3

and more detailed assembler-level changes here  :
http://www.cs.cmu.edu/~fp/courses/15213-s06/misc/asm64-handout.pdf

and sample post aobut gettimeofday() and such things on 64bit  here:
http://www.ussg.iu.edu/hypermail/linux/kernel/0702.0/0082.html

Summing up - 64bit is sometimes faster but almost always , your apps
will eat more RAM.

regards.







-- 
Wojciech Ziniewicz
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