Forum > GPU crunching
[Split] PowerSpectrum Unit Test
Jason G:
How did you do ten runs, while collecting data, on 'that thing' in that timeframe ? magic ?
[ Oh yeah I set the timer tolerances to do that, I forgot ::)]
Miep:
--- Quote from: Jason G on 21 Dec 2010, 12:14:18 pm ---How did you do ten runs, while collecting data, on 'that thing' in that timeframe ? magic ?
[ Oh yeah I set the timer tolerances to do that, I forgot ::)]
--- End quote ---
A run takes some 20 seconds - makes some 5 minutes with graceful rounding. Typing the data into Excel and the calculated values back into the post took about half an hour. :P
timer tolerances?
Jason G:
--- Quote from: Miep on 21 Dec 2010, 12:23:27 pm ---timer tolerances?
--- End quote ---
Yeah, faster cards probably do 'a few more' runs within the allocated 0.5 seconds per test ;)
[BTW:] On Opt1, See the difference in the standard deviations of best & worse cases ? , That's memory&bus contention on the worst cases randomising things up a bit :)
Miep:
--- Quote from: Jason G on 21 Dec 2010, 12:27:14 pm ---Yeah, faster cards probably do 'a few more' runs within the allocated 0.5 seconds per test ;)
--- End quote ---
Well manual data collection works just as well, only more tedious.
--- Quote ---[BTW:] On Opt1, See the difference in the standard deviations of best & worse cases ? , That's memory&bus contention on the worst cases randomising things up a bit :)
--- End quote ---
I was wondering more about the apparent lack of variation on the best case. I would have expected a little more fluctuation.
Jason G:
--- Quote from: Miep on 21 Dec 2010, 12:44:19 pm ---I was wondering more about the apparent lack of variation on the best case. I would have expected a little more fluctuation.
--- End quote ---
Best case requires few memory transfers back to the host CPU ( only one best spike & no detections) ;)
[Edit:] Worst case would be a best signal + numdatapoints/fftlen detections, i.e. not really possible since we're limited to 30 detections, so wouldn't bother transferring more than the first 30 ( ... unlike stock...)
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