Re: [Discuss-gnuradio] Source Block - Flow Control

[Jeff Long]

Should have mentioned ... set the throttle rate just slightly higher 
than what the chain would consume at steady state when all the buffers 
are filled and the USRP is transmitting. How well this works depends on 
what the rest of the chain looks like.

- Jeff

On 10/14/2014 05:52 PM, Jeff Long wrote:
> Use a throttle block immediately after your source block, setting the
> vector size to match your source.
>
> - Jeff
>
> On 10/14/2014 04:34 PM, David Halls wrote:
> > Dear All,
> >
> > I am wondering how to add some flow control to a source block, so that
> > it doesn’t fire out items so quickly.
> >
> > Later stages of my flow graph are slowed by various bits of processing
> > and combining, before transmission via USRP, with bursts being
> > transmitted every few seconds.
> >
> > What happens is that the block fires out 1,000s of vectors, and then
> > seems to slow down and settle into sync with the rest of the flow graph
> > after a few seconds. As my source block is reading in from a Database, I
> > want to slow this initial rate significantly.
> >
> > The block outputs vectors of bytes (v_len=144). Any ideas?
> >
> > Regards,
> >
> > David
> >
> > ---------------------------------------------------------------
> >
> > David Halls Ph.D.
> >
> > Research Engineer
> >
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> >
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