Re: [Discuss-gnuradio] Re-writing blocks using intel libraries

[Eric Blossom]

On Tue, Dec 11, 2007 at 04:03:28PM -0800, Dan Halperin wrote:
> Eugene Grayver wrote:
> > Please see answers in-line.
> >   Which blocks are causing you the biggest problem?
> > 
> > I got a 2x improvement on all the filtering blocks.  About a 40% 
> > improvement for sine/cosine generation blocks.  This includes gr_expj, 
> > gr_rotate.
> 
> I should mention that gr_rotate's performance can be _greatly improved_
> by a simple change that, rather than rescaling the multiplier every
> iteration, rescales every k, e.g. k=1000. I think I have an earlier
> mailing list post about this. IIRC, the patch didn't go in because there
> seemed to be no consensus about what k to use...

Ooops, sorry about that.  Let me dig through the archived discussion
and we'll get it in.

Eric