[Wien] What type of CPU's for big calculations?

[shaposh@isp.nsc.ru]

Sorry for interfereing, what do you mean by "real" and "pseudo"
64bit processors?
Both AMD64 and Intel EM64T able to  directly access memory over 4GB. They also 
have 64-bit general purpose registers (not to mention 128-bit SSE registers). 
They are "real" 64bit processors. 
Intel ICC for C/C++ and IFORT for fortran90 compilers can produce native and 
very efficient 64bit code for Intel EM64T CPUs. They also very good for AMD 
(better than gcc and on par with expensive PathScale).

Best Regards,
A. Shaposhnikov

On Saturday 11 November 2006 14:10, Gerhard Fecher wrote:
> Hi Peter just some other questions,
>
> Do you suggest that a cluster build from Core 2 Duo (E6700) machines is
> better than a Xeon Dual core (5160, 5080, 7xxx) Cluster. In the first you
> combine 2 CPU systems in the second you may combine at rather the same
> price 4 CPUs per machine (or more if you like to go for an expensive
> solution.)
>
> The Ithanum are real 64 bit processors, is there any fortran compiler
> breaking the 2GB barrier on the pseudo-64 bit CPUS (Intel or AMD).
>
> The last point is right, 2 calculations in parallel with OMP=1 is faster
> than 2 consecutive runs with OMP=2, I played with it and up to 4
> calculations in parallel and serial.
>
> Ciao
> Gerhard
>
>
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