Re: [Discuss-gnuradio] VOLK - vector multiplication
On 03/20/2014 07:16 PM, Nasi wrote: > I've got this error: > > > /tmp/ccE79VRG.o: In function `main': > > t2_rx_ompalg.cc:(.text+0x6a5): undefined reference to > `volk_32fc_x2_dot_prod_32fc' > collect2: error: ld returned 1 exit status > > I was running it inside main function as > > g++ -std=c++11 t2_rx_ompalg.cc -o t2_rx_ompalg -lm -lfftw3 You need to link to VOLK, too. M ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] VOLK - vector multiplication
I've got this error: /tmp/ccE79VRG.o: In function `main': t2_rx_ompalg.cc:(.text+0x6a5): undefined reference to `volk_32fc_x2_dot_prod_32fc' collect2: error: ld returned 1 exit status I was running it inside main function as g++ -std=c++11 t2_rx_ompalg.cc -o t2_rx_ompalg -lm -lfftw3 Do you know what is it for? - NE Thu, 20 Mar 2014 13:04:02 -0400 от Tom Rondeau : >On Thu, Mar 20, 2014 at 12:51 PM, Nasi < nesaz...@mail.ru > wrote: >> Thanks! >> >> As I see you apply it to the first element of x as in >> volk_32fc_something_32fc(&x[0], ...);. >> I want to multiply the whole vector like as a inner product of two vectors. >> Is it possible? >> >> - >> NE > >Not sure I exactly follow your comment, but you can do something like this: > >int N; >vector x(N); >vector y(N); >vector z(N); > >// fill x and y with stuff > >volk_32fc_x2_dot_prod_32fc(&z[0], &x[0], &y[0], N); > >That will take the dot product of x and y and put the results in z. > >Tom > > >> Четверг, 20 марта 2014, 10:28 -04:00 от Tom Rondeau < t...@trondeau.com >: >> >> On Thu, Mar 20, 2014 at 10:09 AM, Aditya Dhananjay < adi...@cs.nyu.edu > >> wrote: >>> I had the same question. Thanks! :) >> >> One thing that I forgot to mention is that VOLK is written purely in >> C, so C++ vectors as-is won't work. You need to index them, but >> luckily, std::vector's are guaranteed to be contiguous in memory when >> indexed. >> >> In other words: >> >> std::vector x; >> volk_32fc_something_32fc(&x[0], ...); >> >> Tom >> >> >> >>> On Thu, Mar 20, 2014 at 10:07 AM, Tom Rondeau < t...@trondeau.com > wrote: On Thu, Mar 20, 2014 at 7:05 AM, Nasi < nesaz...@mail.ru > wrote: > Hi all, > > I am using ubuntu 13.04, GNUradio 3.7. > I have a question related to VOLK library. > > When I create a vector, lets say: > > vector y1; > > Can I multiply this vector to another vector using VOLK? > Is there any good documentation for this? > > -- > NE Myself and Nick McCarthy have published and presented on VOLK. Here's a pretty good overview video of using it: http://www.trondeau.com/blog/2013/6/12/nearly-50-minutes-of-volk.html To answer your question, yes, building a vector like that is acceptable for use with volk kernels as long as you are using the correct data types. Be aware of alignment requirements, though, which the link above explains. Tom ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>> >> >> >> >> -- >> NE -- NE ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] VOLK - vector multiplication
On Thu, Mar 20, 2014 at 12:51 PM, Nasi wrote: > Thanks! > > As I see you apply it to the first element of x as in > volk_32fc_something_32fc(&x[0], ...);. > I want to multiply the whole vector like as a inner product of two vectors. > Is it possible? > > - > NE Not sure I exactly follow your comment, but you can do something like this: int N; vector x(N); vector y(N); vector z(N); // fill x and y with stuff volk_32fc_x2_dot_prod_32fc(&z[0], &x[0], &y[0], N); That will take the dot product of x and y and put the results in z. Tom > Четверг, 20 марта 2014, 10:28 -04:00 от Tom Rondeau : > > On Thu, Mar 20, 2014 at 10:09 AM, Aditya Dhananjay > wrote: >> I had the same question. Thanks! :) > > One thing that I forgot to mention is that VOLK is written purely in > C, so C++ vectors as-is won't work. You need to index them, but > luckily, std::vector's are guaranteed to be contiguous in memory when > indexed. > > In other words: > > std::vector x; > volk_32fc_something_32fc(&x[0], ...); > > Tom > > > >> On Thu, Mar 20, 2014 at 10:07 AM, Tom Rondeau wrote: >>> >>> On Thu, Mar 20, 2014 at 7:05 AM, Nasi wrote: >>> > Hi all, >>> > >>> > I am using ubuntu 13.04, GNUradio 3.7. >>> > I have a question related to VOLK library. >>> > >>> > When I create a vector, lets say: >>> > >>> > vector y1; >>> > >>> > Can I multiply this vector to another vector using VOLK? >>> > Is there any good documentation for this? >>> > >>> > -- >>> > NE >>> >>> Myself and Nick McCarthy have published and presented on VOLK. Here's >>> a pretty good overview video of using it: >>> http://www.trondeau.com/blog/2013/6/12/nearly-50-minutes-of-volk.html >>> >>> To answer your question, yes, building a vector like that is >>> acceptable for use with volk kernels as long as you are using the >>> correct data types. Be aware of alignment requirements, though, which >>> the link above explains. >>> >>> Tom >>> >>> ___ >>> Discuss-gnuradio mailing list >>> Discuss-gnuradio@gnu.org >>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>> >> > > > > -- > NE ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] VOLK - vector multiplication
Thanks! As I see you apply it to the first element of x as in volk_32fc_something_32fc(&x[0], ...);. I want to multiply the whole vector like as a inner product of two vectors. Is it possible? - NE Четверг, 20 марта 2014, 10:28 -04:00 от Tom Rondeau : >On Thu, Mar 20, 2014 at 10:09 AM, Aditya Dhananjay < adi...@cs.nyu.edu > wrote: >> I had the same question. Thanks! :) > >One thing that I forgot to mention is that VOLK is written purely in >C, so C++ vectors as-is won't work. You need to index them, but >luckily, std::vector's are guaranteed to be contiguous in memory when >indexed. > >In other words: > >std::vector x; >volk_32fc_something_32fc(&x[0], ...); > >Tom > > > >> On Thu, Mar 20, 2014 at 10:07 AM, Tom Rondeau < t...@trondeau.com > wrote: >>> >>> On Thu, Mar 20, 2014 at 7:05 AM, Nasi < nesaz...@mail.ru > wrote: >>> > Hi all, >>> > >>> > I am using ubuntu 13.04, GNUradio 3.7. >>> > I have a question related to VOLK library. >>> > >>> > When I create a vector, lets say: >>> > >>> > vector y1; >>> > >>> > Can I multiply this vector to another vector using VOLK? >>> > Is there any good documentation for this? >>> > >>> > -- >>> > NE >>> >>> Myself and Nick McCarthy have published and presented on VOLK. Here's >>> a pretty good overview video of using it: >>> http://www.trondeau.com/blog/2013/6/12/nearly-50-minutes-of-volk.html >>> >>> To answer your question, yes, building a vector like that is >>> acceptable for use with volk kernels as long as you are using the >>> correct data types. Be aware of alignment requirements, though, which >>> the link above explains. >>> >>> Tom >>> >>> ___ >>> Discuss-gnuradio mailing list >>> Discuss-gnuradio@gnu.org >>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>> >> -- NE ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] VOLK - vector multiplication
On Thu, Mar 20, 2014 at 10:09 AM, Aditya Dhananjay wrote: > I had the same question. Thanks! :) One thing that I forgot to mention is that VOLK is written purely in C, so C++ vectors as-is won't work. You need to index them, but luckily, std::vector's are guaranteed to be contiguous in memory when indexed. In other words: std::vector x; volk_32fc_something_32fc(&x[0], ...); Tom > On Thu, Mar 20, 2014 at 10:07 AM, Tom Rondeau wrote: >> >> On Thu, Mar 20, 2014 at 7:05 AM, Nasi wrote: >> > Hi all, >> > >> > I am using ubuntu 13.04, GNUradio 3.7. >> > I have a question related to VOLK library. >> > >> > When I create a vector, lets say: >> > >> > vector y1; >> > >> > Can I multiply this vector to another vector using VOLK? >> > Is there any good documentation for this? >> > >> > -- >> > NE >> >> Myself and Nick McCarthy have published and presented on VOLK. Here's >> a pretty good overview video of using it: >> http://www.trondeau.com/blog/2013/6/12/nearly-50-minutes-of-volk.html >> >> To answer your question, yes, building a vector like that is >> acceptable for use with volk kernels as long as you are using the >> correct data types. Be aware of alignment requirements, though, which >> the link above explains. >> >> Tom >> >> ___ >> Discuss-gnuradio mailing list >> Discuss-gnuradio@gnu.org >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> > ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] VOLK - vector multiplication
I had the same question. Thanks! :) On Thu, Mar 20, 2014 at 10:07 AM, Tom Rondeau wrote: > On Thu, Mar 20, 2014 at 7:05 AM, Nasi wrote: > > Hi all, > > > > I am using ubuntu 13.04, GNUradio 3.7. > > I have a question related to VOLK library. > > > > When I create a vector, lets say: > > > > vector y1; > > > > Can I multiply this vector to another vector using VOLK? > > Is there any good documentation for this? > > > > -- > > NE > > Myself and Nick McCarthy have published and presented on VOLK. Here's > a pretty good overview video of using it: > http://www.trondeau.com/blog/2013/6/12/nearly-50-minutes-of-volk.html > > To answer your question, yes, building a vector like that is > acceptable for use with volk kernels as long as you are using the > correct data types. Be aware of alignment requirements, though, which > the link above explains. > > Tom > > ___ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] VOLK - vector multiplication
On Thu, Mar 20, 2014 at 7:05 AM, Nasi wrote: > Hi all, > > I am using ubuntu 13.04, GNUradio 3.7. > I have a question related to VOLK library. > > When I create a vector, lets say: > > vector y1; > > Can I multiply this vector to another vector using VOLK? > Is there any good documentation for this? > > -- > NE Myself and Nick McCarthy have published and presented on VOLK. Here's a pretty good overview video of using it: http://www.trondeau.com/blog/2013/6/12/nearly-50-minutes-of-volk.html To answer your question, yes, building a vector like that is acceptable for use with volk kernels as long as you are using the correct data types. Be aware of alignment requirements, though, which the link above explains. Tom ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
