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Re: [Discuss-gnuradio] GL sinks freeze

From: Josh Blum
Subject: Re: [Discuss-gnuradio] GL sinks freeze
Date: Tue, 22 Dec 2009 17:38:59 -0800
User-agent: Thunderbird (X11/20090817)

Nick Foster wrote:
Hi all,

I'm having some trouble with the OpenGL versions of the wxgui waterfall and FFT 
sinks. I'm using r11659 (8/30/09). To test the sinks, I just created a simple 
flowgraph with a 32ksps random stream (throttled) feeding the sinks, similar to 
what the built-in test methods for the sinks use.

All the newest stuff is on git: http://gnuradio.org/cgit
For some reason we wont clear the svn stuff, probably to confuse people...

The FFT sink freezes up after displaying a single frame in GL mode, and never 
updates. It then locks up, using 100% CPU. The waterfall sink doesn't even 
load; it just loads an empty gray box and then freezes. However, it doesn't use 
any CPU time. Both sinks work fine in non-GL mode. Interestingly, the GL 
versions of the scope sink and histogram sink seem to work fine, so I don't 
believe it to be an issue with my graphics driver (nvidia kernel driver on 
Ubuntu Hardy).

The waterfall sink is making heavy use of textures and I could imagine that having problems but... the scope and the fft are exercising the exact same gl plotter base class. So I cannot fathom why the fft freezes for you and the scope works.

The only thing that comes to mind is the update rate on the fft is probably larger than the scopes. Not that the rate should be enough to kill your cpu, but if the gl configuration has issues, that could explain it.

You may try turning your ubuntu visual effects to off. They have been known to mess up other applications that try to use gl.

Are there any known issues with the GL waterfall or FFT sinks? Has anyone else 
encountered this issue? I'd like to use the extra functionality the GL 
waterfall sink offers.

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