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Re: [Discuss-gnuradio] Flow Graph Reconfiguration
From: |
Kevin Reid |
Subject: |
Re: [Discuss-gnuradio] Flow Graph Reconfiguration |
Date: |
Thu, 4 Sep 2014 19:57:34 -0700 |
On Sep 4, 2014, at 13:27, Gould, Daniel N. <address@hidden> wrote:
> FlowGraph 1:
> [src] -> [filt] -> [modem-1]
>
> FlowGraph 2:
> [src] -> [filt] -> [modem-2]
>
> FG-1 runs to completion, is then disconnected. Then FG-2 is connected and
> executed. For both flowgraphs the src and filt are the same. The modems are
> switched out and as such the requirements on the filter output buffer size
> changes. The filter min_output_buffer size is adjusted following the
> disconnect from FG-1 and prior to connecting FG-2.
>
> When FG-2 is executed I immediately get an error from the scheduler
> complaining that a downstream sample requirement can’t be met.
What actual block classes are you using?
I've recently found a bug with the same effect as you describe, which occurs
when I reuse a pfb_arb_resampler_ccf (but not involving any explicit buffer
control). See my report: http://gnuradio.org/redmine/issues/713
A workaround I found was to redesign the graph so that I could use a
rational_resampler instead, but I don't know if this bug is truly specific to
that block or if the change avoids the problem by accident.
--
Kevin Reid <http://switchb.org/kpreid/>