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SETI 3.0 - 40% faster than v.2 on my C566@867!

spamboy

Banned
Wow! I just got the latest version of the NT command line executable and much to my pleasant surprise, it runs at least 40% faster than the old version. Although they say this latest version should take a little longer per unit, it's much faster for me...

Now here's why I think this is: My Celeron 566 at 867MHz was previously taking around 10 hours a unit, which is about as long as my PII 400@412. The reason is almost undoubtably the size of the L2 cache. Although the PII's clock speed and L2 cache run much slower than the Celeron's, It has 4 times the L2, which even in its PII form is much faster than system memory. v.2 obviously needed more L2 to run optimally than the poor Celeron had, so all its clock speed advantages were wasted when it had to hit the system memory. Thus, the two chips performed similarly despite the Celeron's usually huge power advantage.
But in v3.0, the executable must not need so much L2 to run at it's "full" speed, so my Celeron was free to haul ass like it should have been, and times dropped to about 6 hours a unit (while I was using the computer!). This measures up nicely to the mid-6 hour times I've seen 800/133 Pentium III's bringing in. My Celeron had its chains taken off and now it can fly (and not be embarrased by chips running at less than half the speed). 😀
So all us Celeron owners owe a big thanks to the SETI programers for giving us a big boost!

Any other Celeron owners seen similar changes? I'm curious.
 
I dropped from 13-14 hours with the 2.04 GUI to 9-11 hours with the 3.0 CLI. 🙂

spamboy, are you on the Team AnandTech SETI team? I don't recognize your name.
 
You should have asked, I could have told you that 🙂
Then new (3) client is MUCH faster on smaller fast cache CPU's (Coppermines, Celerons, Duron, T-bird)
The old heavy hitters (Xeon's, Alphas) are slower.
 
spamboy - Please join TA SETI!

All of my times have dropped as well, but this is definately not the case for everyone. It's due to a change in the way they calc the FFT. It uses 4% more memory, but the calc is faster.
 
OB, is the Xeon actually slower with the 3.x clients? I didn't think it would be since it has full speed cache.
 
Yes it is slower, because there is 40% more work in each WU. Before the cache was bottlenecking the faster CPU's with smaller cache. Now they do not have that disadvantage, so they are on more of an even playing field with other CPU's. So gone are the days when a 400Mhz Xeon would wipe up a 700Mhz P3.
 
ya my p2 400 went from 8 hours to 10 hours. my p3 700 went from 7 hours to 5, i'll check how my pro did when i get home.
 
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