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Re: [Discuss-gnuradio] Metafile Sink Execution Time

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] Metafile Sink Execution Time
Date: Mon, 25 Aug 2014 17:05:41 -0400
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On 08/25/2014 04:30 PM, Jonathan Fox wrote:
Got rid of it and it sped things up considerably. I think the whole reason why I had it there in the first place was to prevent sample overruns.

Thanks for the help.

Putting a throttle in a flow that already has rate-pacing will just make things worse...

On Mon, Aug 25, 2014 at 3:15 PM, <address@hidden> wrote:

First thing, get rid of the throttle.  It is only needed in *simulations*.  In graphs with real hardware, everything is "paced" by the hardware.





On 2014-08-25 15:12, Jonathan Fox wrote:

How long it takes for the Metafile Sink to began recording data?

I have a "No GUI" script that is a simple USRP source, throttle, and metafile sink. All have a 1M sample rates; the metafile sink has a relative rate of change of 1, 1M segment size, and have a detached header.

I start my script up I get the usually GNU Radio feed back (e.g. "Opening a USRP2/N-Series device..."), I get the "Press Enter to quit:", however post processing of collected meta data has shown that I can not immediately start my data collection as it won't collect the leading edge of the signal, I need to wait several seconds before proceeding. Why does this happen and is it possible to get a prompt on when the metafile sink has started recording?



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Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium

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