[vox-tech] 32 vs. 64

[ALLO (Alfredo Lopez De Leon)]

Thanks Mike,
It is going to be an interesting week, I have never tried to install
Linux in anything this sophisticated. 

Cheers!
Alfredo

-----Original Message-----
From: vox-tech-bounces at lists.lugod.org
[mailto:vox-tech-bounces at lists.lugod.org] On Behalf Of Mike Simons
Sent: Thursday, October 20, 2005 6:06 PM
To: lugod's technical discussion forum
Subject: Re: [vox-tech] 32 vs. 64


On Thu, Oct 20, 2005 at 04:03:54PM -0700, ALLO (Alfredo Lopez De Leon)
wrote:
> I just got a new Poweredge 1850 (Dual Xeon 3.8 GHz, 2 MB RAM, SCSI) 
> and I am planning to install on it Fedora Core 4.  The question is: 
> Should I use the i386 version or the x86_EM64T?
[...]
> I am wondering if I will run into trouble with my applications.  Most 
> of them if not ALL are 32-bit.

You should install the x86-64 version.  The 64-bit compiled code should 
run faster so even if all your apps are 32-bit ... at least you'll have
a 64-bit kernel.

I've not checked how FC4 does it, but most 64-bit linux flavors install
"32-compat" libraries also... some default to 64 bit in /lib and use
/lib32, others default to 32 bit and provide a /lib64.


> Is anybody aware of any potential problems? Is there an associated 
> cost of running 32-bit applications on 64-bit machines?

On the x86 chip there I've not heard of any significant performance hit
running 32 bit code when in 64 bit mode... the same code compiled in 
64-bit mode often run faster because there are twice as many registers.
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