Re: [Discuss-gnuradio] Volk branch on github

[Martin DvH]

I think it would make sense to change the volk interface by adding
kernel calls which can handle the two alignment cases (aligned,
unaligned).
We would have to add a is_unaligned parameter to the volk kernel calls.

The gnuradio blocks would then change in the following way:

So in stead of:

if(is_unaligned()) {
  for(size_t i = 1; i < input_items.size(); i++){
    volk_32fc_x2_multiply_32fc_u(out, out, (gr_complex*)input_items[i],
noi);
  }
} else {
  for(size_t i = 1; i < input_items.size(); i++){
    volk_32fc_x2_multiply_32fc_a(out, out, (gr_complex*)input_items[i],
noi);
  } 
}

You would have:

for(size_t i = 1; i < input_items.size(); i++)
  volk_32fc_x2_multiply_32fc(is_unaligned(), out, out,
(gr_complex*)input_items[i], noi);

You halve the amount of code in gnuradio blocks which to my opinion
makes it much more maintainable.


Martin


On Wed, 2012-02-15 at 12:06 +0100, Martin DvH wrote:
> On Tue, 2012-02-14 at 22:56 -0500, Tom Rondeau wrote:
> > There's been a ton of work going on in getting us ready to really
> > start using Volk in GNU Radio blocks. Instead of repeating myself,
> > here, you can see more about the who/what/when/why/how of the changes
> > here: 
> > 
> > 
> > http://www.trondeau.com/blog/2012/2/13/gnu-radio-is-crap-and-other-such-insights.html
> 
> I think you copied the wrong link.
> You probably meant:
> http://www.trondeau.com/blog/2012/2/13/volk-integration-to-gnu-radio.html
> 
> 
> Martin
> 
> > 
> > 
> > The basic summary is that I'm seeing amazing performance results and
> > I'm very excited to get this into our project.
> > 
> > 
> > I'm really hoping that people can check out the branch and test it out
> > against their applications. A number of changes were made inside GNU
> > Radio and a handful of blocks have been converted to using Volk, and
> > I'd like to see how the performance compares. My own tests show great
> > results, but I have a pretty heterogeneous setup (Linux/Ubuntu and
> > Intel processors).
> > 
> > 
> > I should have another post on my website later this week discussing my
> > benchmark results for the Volk blocks, but anyone interested in
> > testing it out on their own should check out
> > gnuradio-examples/python/volk_benchmark. The README in that directory
> > should help you understand what to do and how to do it.
> > 
> > 
> > We would like to get this merged into GNU Radio master (and therefore
> > version 3.5.2) as soon as possible, so I would really appreciate
> > feedback and bug reports as soon as possible.
> > 
> > 
> > Thanks!
> > Tom
> > 
> > 
> > _______________________________________________
> > Discuss-gnuradio mailing list
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> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> 
> 
> 
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