[Pw_forum] Single precision FFTs on GPUs for QE ?

[xu yuehua]

can you help me about downloading the
http://www.democritos.it/pipermail/pw_forum/     the full raw archive ( 31
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i can not get it now.i am in a hurry to use it .thanks


2007/5/16, Konstantin Kudin <konstantin_kudin at yahoo.com>:
>
> Hi all,
>
> With all the hype surrounding the recent graphics cards and how fast
> they are supposed to be, the following question arises.
>
> If QE were to do everything in double precision, but the FFTs in
> single precision, will it hurt too much? FFTs kind of do few
> operations, so the error accumulation could be tolerable. Of course,
> another issue if the few digits of single precision are really enough
> ...
>
> With multicore cpus it is increasingly difficult to transfer the data
> between the boxes for FFTs, it sure would be easier (in principle) to
> send the data locally to the super fast (tm) GPU.
>
> Anyway, from the implementation perspective, FFTs are currectly
> reasonably well localized in the code, so in principle the hassle of
> using GPUs would be only local in terms of coding :-)
>
> Ideas?
>
> Kostya
>
>
>
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