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Re: [Discuss-gnuradio] Ring-buffer allocation

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] Ring-buffer allocation
Date: Tue, 03 Feb 2009 16:52:34 -0500
User-agent: Thunderbird (X11/20081119)

Eric Blossom wrote:
> OK.  It may no longer be double buffering, so your throughput may be
> down.  But, hey, if it's working :-)
> Eric
OK, so I looked into this further.  If I work backwards from the
file-sink back to the USRP, I have
  a float vector of 16e6 items, which was costing 250e6, a complex
vector of 16e6 items, which was
  costing 500e6, another 16e6 complex vector costing 500e6, and a
complex stream of 32e6 items, costing
  250e6 memory.

I added logic to gr_flat_flowgraph::allocate_buffer   so that if nitems
>= 4 and item_size >= 1<<2, then
     nitems /= 2.

That reduced the memory footprint considerably, and still gives you
double buffering between blocks.

Marcus Leech
Principal Investigator, Shirleys Bay Radio Astronomy Consortium

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