[R] xeon processor and ATLAS

[Uwe Ligges]

Prof Brian Ripley wrote:
> On Tue, 28 Aug 2007, hui xie wrote:
> 
>> hi everyone:
>>
>> I have a Dell Server that has a Xeon processor, and I would like to use 
>> the best ATLAS posted in the R website. I find that R has ATLAS for 
>> core2duo and P4. I am not sure which one of these two is best suited for 
>> Xeon processor, or is that neither of these two is good and I should 
>> stick with the default one that was installed originally?
> 
> And your OS is?
> 
> There are many different 'Xeon' processors with very different 
> capabilities.  

... the earlier similar to P4 and some similar to Core2Duo. You won't 
make use of bigger L2/L3 caches in Xeon processors.

 > You really ought to build ATLAS for yourself if numerical
> linear algebra performance matters to you (and it makes little difference 
> to most people: I think Uwe Ligges quoted 10% for testing all CRAN 
> packages).


Right, it depends on what you are really doing. If most time is spend in 
certain numerical matrix operations, ATLAS is your friend. In all other 
cases, it does not matter so much, as Brian cited correctly.

Uwe Ligges


> 
>> Your advice is very much appreciated!
>>
>> Best,
>>
>> Hui
>>
>>
>> ---------------------------------
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>>
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>>
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