« Return to Thread: 3.9.10

Re: 3.9.10

by Clint Whaley :: Rate this Message:

>>>By the way, I'm integrating ATLAS with R. So far, I've been able to
>>>get the ATLAS blas to link but for some reason the R configure utility
>>>isn't seeing "zgeev_" in the ATLAS lapack libraries. R is compiling
>>>its own lapack from the FORTRAN source. Is that going to be a
>>>performance problem, or is having the ATLAS blas enough?
>>
>> Well, you are losing the benefit of 8 of the hours of tuning you just went
>> through :)
>>
>> If you use stock LAPACK rather than an ATLAS-tuned one, your factorization
>> performance will be reduced enormously on most platforms.
>
>That's what I was afraid of. Any easy way to tell whether it's ATLAS
>or R that's not working?

I am not sure what you mean by this. If R is building a stock lapack, then
I think all you need to is replace its LAPACK with the ATLAS-generated one.
You should be able to detect that you are successful by seeing that LU, LLt
and QR all get faster (if you use 3.8, rather than 3.9, then only LU and LLt
will get noticably faster).

Cheers,
Clint

**************************************************************************
** R. Clint Whaley, PhD ** Assist Prof, UTSA ** www.cs.utsa.edu/~whaley **
**************************************************************************

------------------------------------------------------------------------------
_______________________________________________
Math-atlas-devel mailing list
Math-atlas-devel@...
https://lists.sourceforge.net/lists/listinfo/math-atlas-devel

« Return to Thread: 3.9.10