Re: 32 bit application on 64 bit os

"SaranJothy" <saranjothy@xxxxxxxxx> writes:

hi ,
i have a 64 bit machine(processor and os) and i built a 32 bit
application on it.(using m32 gcc option).
I built a 64 application too.
When i run both applications one by one(basically reading and writing
1 GB file) i m not able to find any difference in performace,basically
time.
Why so?

Because you're waiting for the very same hard disk that always works
at the very same slow speed.


* what will be the difference un 32 bit application on 32 bit machine
or 32 application on 64 bit machine?

What's the difference between a I/O bound process, a memory-bus-bound
process or a CPU-bound process?


* i want to know how much performace diffference wil be made by 64 bt
machine?

Depends on the application, the size of the data you're processing,
with respect to the size of of RAM available and of L1, L2, and L3
cache, and of course, the speed of your hard disks. Basically, I
guess that 64-bit vs. 32-bit won't be really significant.



* for a 64 bit machine (processor) to act as a 32 bit machine, Do i
need to compile the kernel? if so how?Will making architecture as i386
alone will make it?

sorry for too many questions at one post.
Thanks in advance

-SaranJothy



--
__Pascal Bourguignon__ http://www.informatimago.com/

"This statement is false." In Lisp: (defun Q () (eq nil (Q)))
.

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