Re: [Discuss-gnuradio] gr-gcell fft

[Eric Blossom]

On Thu, Jun 26, 2008 at 06:36:05PM -0400, Charles Swiger wrote:
> Playing with gr-gcell/src/qa_fft.py and seeing if it can be made to
> handle more than one size=32 fft.  If  I simply double the input data so
> it gets 2 chunks, I get a segmentation fault. Might this be the same
> thing as the 'make check' on Fedora7 issue?
> 
> This works fine:
> 
> -----------------------
> ph =  gcell.program_handle_from_filename("../../gcell/src/lib/spu/gcell_all")
> opts = gcell.jm_options(ph, 1)
> mgr = gcell.job_manager(opts)
> gcell.set_singleton(mgr)
> 
> tb = gr.top_block()
> fft_size = 32
> src_data = tuple([complex(primes[2*i], primes[2*i+1]) for i in  
> range(fft_size)])
> 
> src = gr.vector_source_c(src_data)
> s2v = gr.stream_to_vector(gr.sizeof_gr_complex, fft_size)
> fft = gcell.fft_vcc(fft_size, True, [], False)
> v2s = gr.vector_to_stream(gr.sizeof_gr_complex, fft_size)
> dst = gr.vector_sink_c()
> tb.connect(src, s2v, fft, v2s, dst)
> tb.run()
> result_data = dst.data()
> -------------------------
> 
> and with a print statement in gcell_fft_vcc.cc to show the noutput_items
> it shows 1 and runs fine.  Changing to this:
> 
> -------------------------
> src_data_1 = tuple([complex(primes[2*i], primes[2*i+1]) for i in 
> range(fft_size)])
> src_data = src_data_1 + src_data_1
> -------------------------
> 
> I get:
> 
> gcell_fft_vcc::work - noutput_items: 2
> Segmentation fault
> 
> I'll just upgrade to Fedora8 if that appears to be the problem, per
> this:
> 
>         FYI, I took a build tree compiled on Fedora 8, and was able to
>         "make
>         check" it OK on an FC7 PS3 and an F8 PS3.  I haven't spent any
>         time
>         narrowing down the problem beyond this.  Thus, it's not kernel
>         related.  I also ran the inverse test: code compiled on an FC7
>         PS3
>         fails on FC7 and F8.
>         
> --Chuck

Chuck,

I ran your test on a F8 PS3 and it worked fine.

Eric