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Experimenting with Rblas.dll

3 messages · Kenneth Cabrera, Brian Ripley

Original
Kenneth Cabrera
# 
Im using cygwin for ATLAS because the windows.txt on /doc says:
"You will want to download the "full" version of cygwin, which
includes compilers, shells, make, etc.  If you need fortran, that must be
downloaded separately"

I try to use MinGW to compile ATLAS, but when it try to execute
xconfig.exe it freezes, both with the MSYS environment and without.

Maybe I am doing something wrong trying to compile ATLAS on MinGW, but
I don't know what. Please help.
Do you mean the ATLAS will not do a good job?

Thank you!

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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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Brian Ripley
#
On Tue, 12 Nov 2002, Kenneth Cabrera wrote:

            

      
      
      
    

        
^^^^^^^^^^^
Wrong compiler, if you really used cygwin.

On small problems very small changes in the compiler or the problem can
affect the speed comparisons.  With large problems ATLAS wins hands down.

Very few things people do with R are actaully affected significantly by
the BLAS speed.