>>> 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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