Flow graph freezes up

Hello,

My gnuradio application seems to freeze from time to time. I think that
this issue was raised before (
http://lists.ettus.com/pipermail/usrp-users_lists.ettus.com/2012-March/003969.html).
However, I did not see a solution that would “permanently” fix the
problem.

My application works in a repeated on-off manner. The receiver USRP
works
in the following way:

1.The flowgraph starts. It runs for 5 second while collecting data and
doing some online processing. Thereafter, the flowgraph stops.
2. I do some off-line processing with the stored data for the next 5
seconds
3. The flowgraph is restarted and step 1-2 are repeated.

The flowgraph looks like the following:

USRP Source --> Log power FFT --> Vector to stream --> File Sink.

However, the flow graph freezes from time to time. This freezing occurs
once in every 5-10 trials. It is surprising since I hardly see any
overrun
in the receiver (I am running the USRP at 4 MS/s and performing 4096
point
FFT). Besides, I have a python code that pings the USRP every time
before
starting the flowgraph.

I am using USRP N210, the latest GNUradio & UHD drivers, Ubuntu 12.04.
Any
suggestions on resolving this issue will be very appreciated.

Thanks,

Nazmul


Muhammad Nazmul I.

Graduate Student
Electrical & Computer Engineering
Wireless Information & Networking Laboratory
Rutgers, USA.

This forum is not affiliated to the Ruby language, Ruby on Rails framework, nor any Ruby applications discussed here.

| Privacy Policy | Terms of Service | Remote Ruby Jobs