Hi Eric, Sorry I was busy yesterday and today so I got to debug just now.
I did what you told me to then use "(gdb) attach $pid". then "(gdb) continue". the process seems slowed down quite a lot and almost halt (but it shouldn't be). in this case I can't make the process crash and backtrace in gdb. maybe I did something wrong that made the process doesn't crash... I'm a newbie of gnu radio and gdb.... Yanyan Eric Blossom wrote: > > On Thu, Mar 12, 2009 at 10:01:28AM -0700, yyzhuang wrote: >> >> Hi Eric, >> >> The command line: sudo ./tunnel.py --freq 2.44G --bitrate 500k -v (is >> bitrate has something to do with buffer?) >> >> I installed GNU Radio from here: svn co >> http://gnuradio.org/svn/gnuradio/branches/releases/3.1 gnuradio > > Thanks. > >> I never had that buffer problem before I moved the 2 boxes to another lab >> (from computer science lab to ee lab). Will it because of the higher >> interference in the busier channel that caused too many packets being >> queued >> in the buffer, and caused the buffer over flow? > > No, the error message most likely indicates an internal error in one > of the blocks. If you can reproduce the problem and can grab a gdb > backtrace when it happens, that would be very helpful in figuring out > which block has the problem. > > Here's how to use gdb with python. Add the code below to the top of > tunnel.py, after all the imports. > > Debugging with gdb > > If your block isn't working, and you can't sort it out through python > test cases or a few printfs in the code, you may want to use gdb to > debug it. The trick of course is that all of GNU Radio, including your > new block, is dynamically loaded into python for execution. > > Try this: In your python test code, after the relevant imports, print > out the process id and wait for a keystroke. In another window run gdb > and tell it to attach to the python process with the given process > id. At this point you can set breakpoints or whatever in your code. Go > back to the python window and hit Enter so it'll continue. > > #!/usr/bin/env python > from gnuradio import gr > > > # insert this in your test code... > import os > print 'Blocked waiting for GDB attach (pid = %d)' % (os.getpid(),) > raw_input ('Press Enter to continue: ') > # remainder of your test code follows... > > Eric > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > -- View this message in context: http://www.nabble.com/tunnel.py-buffer-crash-tp22470731p22507897.html Sent from the GnuRadio mailing list archive at Nabble.com. _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
