I can borrow my lab mates N210 and see what kind of performance I can get out of it on my T410 Thinkpad (i7 proc).
On Tue, Jul 5, 2011 at 9:12 PM, Marcus D. Leech <mle...@ripnet.com> wrote: > > What sort of CPU are you using? > > > > --Colby > AMD Phenom II X6 1055T, with 6GB of 1333MT/s memory. Rough ballpark > calculations show > me that even a 4096-bin FFT shouldn't take more than about > 0.45GFlop/sec at 25Msps, and the > CPU is easily capable of at least 8GFlop/sec/core. So I'm not sure > why it's baffing at 25Msps. > > I've tried using both the on-mobo 1GiGE interface, and a PCI-resident > one. Neither of those makes > any difference to getting large numbers of 'O' at 25Msps. > > If I decimate by 3 or more before the FFT (after vectorizing), I runs > OK, consuming about 40% of the > total system CPU, and not producing any 'O'. I could then, > theoretically, process the FFT output vector > to extract only the magnitudes of the bins that correspond to my > channels of interest. But > decimating by 3 means that I'm losing sensitivity by a factor of > sqrt(3), which I'd rather not have > to "swallow", the application is for radio astronomy, where > sensitivity is quite important. > > -- > Principal Investigator > Shirleys Bay Radio Astronomy Consortium > http://www.sbrac.org > > >
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