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drummers-lowrise
11) Message boards : News : Cheaters' credits rescinded (Message 64534)
Posted 2343 days ago by Profile VictordeHollanderProject donor
We (DPC) fell victim to a few of these cheating team-hoppers.
On a positive side, none of our regular members cheated and now we can overtake SETI.USA again :).
12) Message boards : Number crunching : The Year of The Snake Challenge (Message 63750)
Posted 2374 days ago by Profile VictordeHollanderProject donor
http://www.primegrid.com/workunit.php?wuid=314989035 (done 2013-03-22)

2 to go!
13) Message boards : Number crunching : Welcome to the Equinox Challenge (Message 63607)
Posted 2378 days ago by Profile VictordeHollanderProject donor
Some of my PPS LLR tasks are validated without a wingman. I thought LLR projects always needed two results to eliminate hardware and software errors?
14) Message boards : Number crunching : Valentine's Day Challenge (Message 62599)
Posted 2410 days ago by Profile VictordeHollanderProject donor
I just tested the effect of HT with a 3770k @4,2 and found something odd:
3770k @4,2 (HT on) | 1653 sec = 27:33 (8 WUs)
3770k @4,2 (HT off) | 712 sec = 11:52 (4 WUs), which implies 23:44 for 8 WUs
HT off is faster in this case, HT actually slows down the computation?

Just for comparison my 2500k @4,0 :
2500k @4,0 | 823 sec = 13:43 (4 WUs)
15) Message boards : Sieving : We need your help with GFN Sieving! (Message 61117)
Posted 2451 days ago by Profile VictordeHollanderProject donor
Since the CW sieve has been completed for now, would it be possible to bring GFN sieve to BOINC? Some time ago it was quite popular, but now with the new n=20 genefer tasks/challenge people have lost interest. Maybe with a new BOINC project/badge people will renew their interest. And let us not forget the Keplar GPUs are more efficient at sieving than at Genefer.

What I found in the GFN sieve discussion: http://primesearchteam.com/showthread.php?t=40&page=17
Optimal sieve point for n=20 is ~ 100E (100,000P), currently sieved to 26,000P
Optimal sieve point for n=21 is ~ 400E (400,000P), currently sieved to 20,200P
Optimal sieve point for n=22 is ~ 1000E (=1,000,000P), currently sieved to 41,300P

So about 74E + 380E + 959E = 1413E is still needed to reach optimal sieve depth for these N's , while only 87E has been completed so far. To put that in perspective, that is more than 5000 million BOINC credits worth left to sieve.
16) Message boards : Number crunching : The Year of The Snake Challenge (Message 60890)
Posted 2455 days ago by Profile VictordeHollanderProject donor
Thanks Michael, for expanding (and correcting) on my explanation. I agree that credits should be fair and the effect of credits should not be underestimated. For example Milkyway@home had a weekend with double credits to compensate for their downtime and serverproblems some time ago, the output (both in credits and Gflops) of the project exploded in that weekend. This was of course good for Milkyway@home, but it also had an unwanted side-effect to drew people from other projects that weekend, myself included.
17) Message boards : Number crunching : The Year of The Snake Challenge (Message 60881)
Posted 2455 days ago by Profile VictordeHollanderProject donor
The scoring is based on the time a task takes on a CPU, if they raise it to 100k instead of 24k then everybody would only run genefers with CPU and nobody would run any other LLR sub-projects anymore, which would be a shame. Actually I think the scoring is even a bit higher then most LLR projects. Of course sieving with a GPU gives way more points, but with genefer you have a chance to find a top 10 prime!

Edit:
Is it possible to let the clean up of this challenge be done only by PCs which have low error rates and decent return times? Otherwise the clean up of this challenge will take maybe more than a month? I now have a GFN task running, that has been sent out 9 times and only reported once. And this is not an isolated case, I see a lot of tasks with _4 or higher.
18) Message boards : Number crunching : GPU Performance at PrimeGrid - October 2011 Update (Message 60523)
Posted 2468 days ago by Profile VictordeHollanderProject donor
Around the PPS sieve challenge in 2011 they changed the length of the sieves and raised the credits accordingly. The WUs we are crunching are definitely the longer ones, but the times in the opening post are probably for the shorter ones from before the PPS sieve challenge in 2011.
19) Message boards : Number crunching : GPU Performance at PrimeGrid - October 2011 Update (Message 60512)
Posted 2469 days ago by Profile VictordeHollanderProject donor
Is it possible that these are the runtimes with the shorter 6G WUs instead of the 9G WUs we are currently crunching? Since my GTX470 can never do a WU in 15 min, even with OC. But with 1.5x the runtimes they are pretty accurate.

Here my times and some from our (DPC) forum members:
GTX470 @608 MHz (stock) 21:40
GTX470 @700 MHz (OC) 18:25
GTX480 @700 MHz (stock) 17:12

GTX580 (stock) 14:45 - (Arjant2)
GTX570 (stock) 16:39 - (Amberjr)
GTX460 EVGA FTW (Factory OC) 32:21 - (MAB The Frisian)
7970 @1100 MHz (OC) ~28min - (Booster)

Edit: They must be with the shorter WUs, the GTX460 FTW from MAB The Frisian is the same as he listed in the second message in this topic.
20) Message boards : Number crunching : Winter Solstice Challenge (Message 60496)
Posted 2469 days ago by Profile VictordeHollanderProject donor
Only 2 points between us (cows) and the rats (AtP) in the challenge overall standings:
#7 Aggie The Pew 3605.75
#8 Dutch Power Cows 3603.75

This is going to be exciting :D.


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