Today was a day-mare for me. I had to reformat/install gnuradio on my
times in few hours.
The story begins when I tried to upgrade my nice working Ubuntu 8.10 OS
the new 9.04 on my old 3.0GHz C2D system (2G RAM). I had an application
which needs much CPU performance. The application is doing a streaming
point FFT with 25MSps on USRP2. The application was consuming about 50%
my CPU (both). That was with Ubuntu 8.10 32 bit + python 2.5 + original
USRP2 firmware ( I think 9936) + gnuradio 10368.
When 9.04 came, I wanted to upgrade my system and even I came with an
to use the 64 bit version with my C2D system. So I reformatted/installed
Ubuntu 9.04 64 bit + python 2.6 + installed latest USRP2 firmware
gnuradio 10945. Every thing was OK.
The surprise was when I started my same application, but its now
about 90% from my CPU!!!. I shocked. I couldn’t figure out what was the
problem because I changed many variables at a time.
To debug the problem, I reformatted/installed Ubuntu 9.04 32 bit +
2.6 + same USRP2 firmware (10766) + gnuradio 10945. This time the CPU
utilization was 75%. So may be this is a bad OS + GNURadio interaction.
To be sure, I reformatted/installed back the Ubuntu 8.10 32 bit + python
- USRP2 firmware (10766) + gnuradio 10945. When checked with the same
application, my CPU utilization was back to 50% and I’m very happy now.
I thought sharing it may be useful to gnuradio developers.
Any suggestions/speculations ???
View this message in context:
Sent from the GnuRadio mailing list archive at Nabble.com.