On 16 July 2010 09:53, Elvis Dowson
<address@hidden> wrote:
Hi,
I noticed that the GNU radio's GUI for a simple FM receiver can become un-responsive. For example, when trying to run the WFM receiver example, the Frequency Slider moves, but the frequency of the station doesn't change. There is a Failed message at the bottom left corner of the GUI.
At times, when it launches, it works fine and doesn't show the audio buffer under-run messages, but if I stop and relaunch the same application, I suddenly get a whole bunch of audio buffer under-runs.
Is GNU Radio stable enough? Or are these type of issues common in the current release, and needs to be fixed?
For example, I notice that if some internal blocks or computations don't correctly align, like if I have a audio input rate of 32051, the system doesn't launch, but if I set the audio input rate to 32050, the WFM receiver launches (refer to my earlier thread, where I still haven't got the rational resampler way of getting the FM receiver to work). See the following thread for the example patch to reproduce this behavior http://old.nabble.com/USRP2-%2B-WBX%3A-Unable-to-receive-FM-signals-td29176138.html
I'm assuming that the FM receiver example is simple enough. But if the system gets bogged down like this with a simple application, what about more complex applications like a WiFi transceiver, or HDTV transmitter/receiver applications?
Is this a general behavior that everyone else sees, i.e. GNU Radio being unstable and un-responsive at times?
I have 8 virtual CPU cores allocated to my Linux VMware image, and a dedicated ethernet port connected to the USRP2. CPU utilization is still restricted to 2 CPUs and the load is between 20 to 30 percent for when running the FM receiver application. The host computer is a iMac quad-core i7 processor at 2.8 GHz. I've allocated 2.5GB RAM to the linux virtual machine.
I would like to know if the system instability and un-responsiveness is something specific to my system configuration or if it is related to GNU Radio or the USRP2 or the particular firmware that I'm using (txrx_wbx).
Elvis Dowson
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