[R] Experimenting with Rblas.dll

[Kenneth Cabrera]

Dear R-List:
I was experimenting with ATLAS to compile Rblas.dll again.
My processor is a PIII (x86 Family 6 Model 8 Stepping) in W2K.
I compile R from the sources with all the recommended tools, no problem.
I remake Rblas.dll from sources with cygwin.
When I use the CRAN compiled version (rw1061.exe) its performance (I use 
kriging function
on GeoR)  is very similar to the one I compiled.
I then recompile my version using the Rblas I built, now the performance 
was down in
relation with the CRAN compiled version. I experiment also with the CRAN 
/ATLAS Rblas.dll
precompiled version.
But the thing that I don't understand is that if I use the Rblas.dll 
form the CRAN version (the one in
the rw1061.exe version) on my compiled version, it is faster!!! than the 
CRAN version and
of course my compiled version both with and without the Rblas recompiled.
I wonder ... why?
I would like to know more about your own experiences in this issue.

Thank you very much!
Kenneth Cabrera

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