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RE: [Discuss-gnuradio] Scope hangs


From: Walker, Robert CIV NSWC Crane, WC NAE Staff
Subject: RE: [Discuss-gnuradio] Scope hangs
Date: Mon, 19 Nov 2007 06:18:55 -0500

Don - Thanks for the info.  I'm using 3.0.3 since I haven't yet seen
instructions for installing 3.1.1 on MingW on the website.

Rob

-----Original Message-----
From: Don Ward [mailto:address@hidden 
Sent: Friday, November 16, 2007 16:08
To: Walker, Robert CIV NSWC Crane, WC NAE Staff;
address@hidden
Subject: Re: [Discuss-gnuradio] Scope hangs

"Walker, Robert CIV NSWC Crane, WC NAE Staff" 
wrote:<address@hidden>

> I tried Tommi Rouvali's mod to audio_fft.py with the throttle added as

> suggested by Johnathan Corgan but my CPU usage still went to 100% and 
> the fft window locked up.  This is on a MingW/Windows XP system with a

> 1.8GHz Pentium M with 512MB RAM.
>
> As a further experiment, I added an audio.sink instead of the throttle

> and I got the tone as well as a working FFT display and CPU usage 
> dropped to 13-15%.
>
> I then tried running fftsink.py since it has throttle statements in 
> the standalone test app at the end and once again the window locked up

> with 100% CPU usage after displaying the first of the two fft screens 
> in that app.  After some experimenting, I changed both gr.sig_source 
> statements to audio.source and got rid of the throttles and everything

> worked fine with CPU usage around 35-50%.
>
> It appears the throttles aren't working the way I think they are 
> supposed to.  Any advice?

What version of GNU Radio are you using?  In version 3.0 (and earlier)
gr.throttle did not work on MinGW (see ticket 103 in gnuradio.org/trac).
It should be ok in version 3.1 and in the latest trunk.

-- Don W.




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