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21) Message boards : Cullen/Woodall prime search : Why did my wingman ask for so little credit on this WU? (Message 19221)
Posted 4764 days ago by dlouweProject donor
Reading the following page might give you a few of the answers you are looking for regarding credit computation.

http://boinc.berkeley.edu/wiki/Computation_credit

The basic hourly claim the client submits with a Result to the project servers is the sum of Whetstone plus Dhrystone values of the last Benchmark divided by about 480 (it varies slightly with processor and OS). Thus for instance (2,000 Whetstone + 6,000 Dhrystone) / 480 = 16.66 hourly claim. This exact value will not always show on the results listing of projects. It is often substituted by their own pre-assigned credit value.


Using this formula, we can determine the rate at which these computers will gain credit (per core)

This time it's on Cullen LLR WUs. It crunches these at 127k-129k sec's per WU and is claiming 630 credits for each. My other machine is processing them at 131k-133k secs each claiming 960 cr.


Computer 128275
Measured floating point speed 2457.91 million ops/sec
Measured integer speed 6072.35 million ops/sec
(2457.91+6072.35)/480 = 17.77 hourly

128000s = 35.56h * 17.77 = 631 credits

Computer 86532
Measured floating point speed 3244.17 million ops/sec
Measured integer speed 9255.04 million ops/sec
(3244.17+9255.04)/480 = 26.04 hourly

132000s = 36.66h * 26.04 = 956 credits

So, the expected calculated credit matches up almost exactly with the actual claimed credit.

Also as an example of something even more extreme: I have a P4 that recently did a Cullen LLR, took 224k seconds, and only claimed 557 credit.
22) Message boards : AP26 - AP27 Search : Contact needed with persons that have CUDA-devices (Message 19208)
Posted 4765 days ago by dlouweProject donor
You might also be able to ask over at GPUGRID http://www.gpugrid.net/ - they also work with CUDA.
23) Message boards : Number crunching : The Giving Thanks Challenge (Message 19160)
Posted 4768 days ago by dlouweProject donor
Daaang, looks like my home PC crapped out; it only managed to do about 200 credits worth of work. And I'm out of town all weekend, so it'll not be doing any work at all until Sunday. :(
24) Message boards : Number crunching : The Giving Thanks Challenge (Message 19136)
Posted 4769 days ago by dlouweProject donor
Dang... I didn't time it quite right. My main computer is at home, and still has 15 WUs in queue before it can start on the stuff it is recieving for the challenge. 4 hour handicap.

Also, does anyone know how to get the BOINC client to force request more work? My work machine is still piddling around with a few PPS LLR, so it hasn't started work on the challenge either. (Although at most it can do about 24 WU in 24 hours, so that's not a huge loss)

Edit: Scratch that; for some reason my work PC is still getting PPS LLR, even though it should be getting PSP sieve WUs. What the heck.

Double Edit: Got it to work, somehow. Weird. Anyways, here's to hopefully getting some challenge credit!
25) Message boards : Number crunching : The Giving Thanks Challenge (Message 19130)
Posted 4769 days ago by dlouweProject donor
I've only got one 64-bit machine for this challenge (and one 32-bit), but maybe if I'm lucky I'll squeek into the top 30.
26) Message boards : AP26 - AP27 Search : Contact needed with persons that have CUDA-devices (Message 19103)
Posted 4770 days ago by dlouweProject donor
Wow, progress on this is just fantastic!

I can't wait to see how this runs on my 9800GT when I get home this evening.
27) Message boards : Cullen/Woodall prime search : Why did my wingman ask for so little credit on this WU? (Message 19086)
Posted 4771 days ago by dlouweProject donor
It looks like it's due to his computer having a much lower CPU benchmark than yours. Lower benchmark means lower claimed credit per CPU second. The time difference isn't huge though because LLR doesn't have any advantage on a 64-bit OS, but your CPU benchmark will still be much higher.

I'm not exactly an authority on this stuff though... still seems a bit weird to me.
28) Message boards : Project Staging Area : PRNet Discussion (Old) (Message 19054)
Posted 4772 days ago by dlouweProject donor
If anyone else hasn't, I will be doing this either tomorrow or Thursday evening.

Edit: Are you specifically curious about 9.04 or 9.10? I'm currently running 9.04, but upgrading to 9.10 would be easy enough.
29) Message boards : AP26 - AP27 Search : AP26 Search (2008-2010) (Message 18911)
Posted 4777 days ago by dlouweProject donor
Right, thanks for the correction. Should have been obvious, haha.
30) Message boards : AP26 - AP27 Search : AP26 Search (2008-2010) (Message 18909)
Posted 4777 days ago by dlouweProject donor
Thanks for the explanation, Jarek. That really helped clear things up.

I think the solution for the infinitely many AP-k is really neat. It makes sense that any AP-k will also contain subsets of smaller length k. It's proofs like this that make me so fascinated with math.

Now, I wonder if there is infinitely many AP-k that are not a subset of a longer length k.

Also I'm pretty sure I understand the 29 issue now.

* progression difference is divisible by 29
* every 29 consecutive terms include exactly one term divisible by 29


For these conditions, you could substitute any number, correct? 29 just happens to be a number used by the search program in a way which makes AP29 "invisible" to it.

This is a property of arithmetic progressions that I wasn't aware of previously, but is also incredibly fascinating.


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