[Discuss-gnuradio] Weired GNURADIO Performance

[Firas A.]

Hi,

Today was a day-mare  for me. I had to reformat/install gnuradio on my PC 3
times in few hours.

The story begins when I tried to upgrade my nice working Ubuntu 8.10 OS to
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 1024
point FFT with 25MSps on USRP2. The application was consuming about 50% from
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 idea
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 (10766) +
gnuradio 10945. Every thing was OK.

The surprise was when I started my same application, but its now consuming
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 + python
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 2.5
+ 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 ????

Best Regards,

Firas




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