[mdlug] [Fwd: Re: [opensuse] 64 bit vrs 32 bit advantages speed etc.]

[David Lane]

When I programmed in 16bit pc's there was a limit to the access of RAM.  32bit extended that and of course 64 goes even further, because now things are bigger.  

You would have to restructure applications to take advantage of 64bit architecture. 



----- Original Message ----
From: Aaron Kulkis <akulkis3 at hotpop.com>
To: MDLUG's Main discussion list <mdlug at mdlug.org>
Sent: Wednesday, October 31, 2007 9:58:02 AM
Subject: Re: [mdlug] [Fwd: Re: [opensuse] 64 bit vrs 32 bit advantages speed etc.]


David Lane wrote:
> The key to testing is the applications that exploit the 64bit chip.
> 
> or  handling a multi-tasked heavy load like what is the response from
 a 
> good sized data base query.
> 
> The testing of adding the sums of the square roots from 1 to 
> 1,000,000,000 is okay but what about rendering a movie and
 > something else.
> 
> 

Right.  This shows that, in a case like this (compiling)
which is not a fundamentally 64-bit task, there's no
real performance increase.

For the time being, if you're buying new equipment,
you're probably better off getting 32-bit hardware
at rock-bottom prices, because not only the software,
but that for most tasks being done today, the nature
of the problem being solved is still usually 32-bit
or even less.

> ----- Original Message ----
> From: Aaron Kulkis <akulkis3 at hotpop.com>
> To: "mdlug at mdlug.org" <mdlug at mdlug.org>
> Sent: Tuesday, October 30, 2007 3:09:34 PM
> Subject: [mdlug] [Fwd: Re: [opensuse] 64 bit vrs 32 bit advantages
 speed 
> etc.]
> 
> 
> 
> -------- Original Message --------
> Subject: Re: [opensuse] 64 bit vrs 32 bit advantages speed etc.
> Date: Tue, 30 Oct 2007 14:42:23 -0400
> From: Buddy Coffey <bcoffey at XXXXX.XXXX <mailto:bcoffey at XXXXX.XXXX>>
> To: opensuse at opensuse.org <mailto:opensuse at opensuse.org>
> 
> 
>  >>> Has anyone run benchmarks on an identical system with 32 bit vrs
 64 
> bit?
>  >>>
>  >>>     
> Here is a benchmark of 32 bit vs 64 bit openSuSE 10.3 on a Core 2 Duo
> system.
> 
> I have both 32 bit and 64 bit versions installed in separate
 partitions
> on the same system with all updates applied.
> 
> I ran my computationally intensive code GEMACS
 (http://www.gemacs.com)
> compiled natively for both 32 and 64 bits with the Intel 9.1
 compilers.
> The code performs little I/O and zero graphics.  The code is
> multi-threaded and fairly well balanced, hence, the total CPU numbers
> are about 2X the elapsed time numbers.
> 
> 64 bit:
>   Elapsed time:  59.316 sec
>   Total CPU time: 112.43 sec
> 
> 32 bit:
>     Elapsed time: 59.749 sec
>     Total CPU time: 105.67 sec
> 
> 
> I would be glad to run other comparisons if anyone would like them.
> 
> Buddy Coffey
> Applied Research Associates
> Computational and Applied Electromagnetics
> 
> 
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