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

[David Lane]

I did read an article about re-compiling for the target cpu. It had to do with hyper-threading cpu Pentium 4 HT. You have to test the multi-tasked. 

For example: 
A few years back we had processes  that took too long , so I did an experiment. (This was at a college) There was a process that took an hour ans 20min to process 2000 students. So we broke up the data set and ran it in parallel I started both processes about 5 seconds a part. it took 29min to process 2000 students. Quite an improvement.  

So there are a few thing that the 64bit dual core offerers:

1. Data Transfer 
2. Large Calculations. 
3. Multi Tasking 

In my test the operating system switched tasks between both tasks, that was HP/UX with 5 cpus.  In this case there is just 2.

The other issue is handling memory.  64bit can point to more memory than 32bit.  


----- 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>
To: 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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