On Fri, Apr 13, 2012 at 11:41 AM, Ben Reynwar <b...@reynwar.net> wrote: > 2012/4/12 Alick Zhao <alick9...@gmail.com>: >> Hi all, >> >> Recently I have upgraded my gnuradio build to v3.5.3 on several >> computers, and I find that on two machines with Ubuntu 11.10, make test >> will fail the test qa_constellation_receiver while on the other two with >> Fedora 16 all tests are passed. >> >> To investigate the problem, I add one line in the file >> `gr-digital/python/qa_constellation_receiver.py` which just print the >> value of constellation, differential, and correct before the assert. >> Then I run the script >> `build/gr-digital/python/qa_constellation_receiver_test.sh`. The output >> is recorded and attached below. Among them: >> >> * test.t41.log is from a Thinkpad T41 with Ubuntu 11.10 32bit installed, >> * test.t60.log is from a Thinkpad T60 with Ubuntu 11.10 32bit installed, >> * test.f16.log is from a HP 6531s with Fedora 16 x86_64 installed. >> >> Hope these logs are helpful to diagnose the problem. >> >> PS: As a side note, my debugging line's output appears later than the >> result, which is not the case for screen output. I think this is >> probably related to stdout buffering. >> >> PS2: I once changed the REQ_CORRECT to 0.7 on one Ubuntu machine, >> and then made the test passed. I wonder if it is a valid fix. >> >> alick >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> Discuss-gnuradio@gnu.org >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> > > Weird. This test is probabilistic (not ideal really) but the chance > of it failing due to chance should be very small. If it's > consistently failing on one machine but not another then there's > something fishy going on, and lowering REQ_CORRECT, while making the > test pass, wouldn't help finding what's causing the problem. > > First thing I'd do would be to repeat the test a bunch of times and > confirm you're getting a consistently higher BER on one computer than > another. Then I'd do a complete uninstall and reinstall of gnuradio > on a computer having the issue. If the problem is still there then > it's probably going to be an unpleasant bug to find. > > Has anybody else seen this? > > Cheers, > Ben
Alick, I had seen that before, but it was a virtual machine installation of 11.10, 32-bit. I pinged Ben about it, but he didn't see same results with a native install of 32-bit 11.10. I couldn't track down where the problem was occurring or why, so I chalked it up to a problem with the VM system. Again, is anyone else having an issue like this? It appears to be something really sneaky since most of the qa_constellation tests pass with exactly the same numbers and results as they are expected to but 1 or 2 strangely deviate. Thanks, Tom _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
