Message boards :
Number crunching :
AP credit, can someone expain this?
Message board moderation
Author | Message |
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Oz Send message Joined: 6 Jun 99 Posts: 233 Credit: 200,655,462 RAC: 212 |
Wow, take a look at 3636714988 and 3636594228 - returned within 8 hours of each other, both with 0.00% blanking, both ran in a little under 6k seconds with about 2k CPU time but one yielded 312 credits and one yielded 832. How can one possibly do that? A random number generator? Magjic 8-ball? There are many other examples on my machines which also include tasks with similar credit but 200-300% differences in run time... Flop count is used for verification, right? Why isn't credit equal to flops divided by a constant? Member of the 20 Year Club |
kittyman Send message Joined: 9 Jul 00 Posts: 51468 Credit: 1,018,363,574 RAC: 1,004 |
Or as some of us fondly (NOT) call it, CreditScrewed. "Freedom is just Chaos, with better lighting." Alan Dean Foster |
Darth Beaver Send message Joined: 20 Aug 99 Posts: 6728 Credit: 21,443,075 RAC: 3 |
Or as some of us fondly (NOT) call it, CreditScrewed. +1 |
Oz Send message Joined: 6 Jun 99 Posts: 233 Credit: 200,655,462 RAC: 212 |
Wow, take a look at 3636714988 and 3636594228 - returned within 8 hours of each other, both with 0.00% blanking, both ran in a little under 6k seconds with about 2k CPU time but one yielded 312 credits and one yielded 832. How can one possibly do that? A random number generator? Magjic 8-ball? There are many other examples on my machines which also include tasks with similar credit but 200-300% differences in run time... Ok, I read it, it obviously does not work as stated, if it did, similar jobs would only vary a few percent on the same machine - I could even see a 60-150% range to cover angles and that sort of thing. I could get more consistent credit to work numbers throwing darts blindfolded (slight hyperbole) - I mean it worked more or less okay when they cut the credit in half but now it's just gone mad... Member of the 20 Year Club |
kittyman Send message Joined: 9 Jul 00 Posts: 51468 Credit: 1,018,363,574 RAC: 1,004 |
The kitties just keep throwing lots of darts.....LOL. "Freedom is just Chaos, with better lighting." Alan Dean Foster |
Oz Send message Joined: 6 Jun 99 Posts: 233 Credit: 200,655,462 RAC: 212 |
Just so I am clear on this, the server guesses the performance of the system and if it guesses your system is slow, gives more credit - unless it can't decide - then it uses actual flops, yes? If that's it, it doesn't work - the RAC on my 2.0 GHz dual core, GTX 660 (2GB ram) is constantly higher than my 2.2 GHz dual core, GTX 770 (4GB ram) and as Yosemite Sam so succinctly puts it, "that just ain't right..." Member of the 20 Year Club |
Oz Send message Joined: 6 Jun 99 Posts: 233 Credit: 200,655,462 RAC: 212 |
AAAaaaaaaaaaaaaaaaaaarrrrrrrrrrrrrrrrrrgggggggg!!!! Thanx for letting me whine... Member of the 20 Year Club |
BilBg Send message Joined: 27 May 07 Posts: 3720 Credit: 9,385,827 RAC: 0 |
Read about it here: http://boinc.berkeley.edu/trac/wiki/CreditNew jason_gee seems to know how to fix it (in the code), the hard part is to convince Dr. A. that there exist a problem with CreditNew Observation of CreditNew Impact (4) http://setiathome.berkeley.edu/forum_thread.php?id=73306 "the four known credit System design flaws currently under detailed analysis": http://setiathome.berkeley.edu/forum_thread.php?id=73935&postid=1498621#1498621 Â - ALF - "Find out what you don't do well ..... then don't do it!" :) Â |
juan BFP Send message Joined: 16 Mar 07 Posts: 9786 Credit: 572,710,851 RAC: 3,799 |
Actualy they are testing a new builds at albert@home to try to fix that but they are in the beginng of the hard task. |
Price Family - Brighton Send message Joined: 4 Nov 00 Posts: 42 Credit: 48,039,168 RAC: 233 |
The title of this thread seems to refer to Astropulse credit. I didn't think that was affected by credit new. |
Richard Haselgrove Send message Joined: 4 Jul 99 Posts: 14649 Credit: 200,643,578 RAC: 874 |
The title of this thread seems to refer to Astropulse credit. I didn't think that was affected by credit new. All credit awarded by the SETI project - both for Multibeam tasks and for Astropulse tasks - is determined by CreditNew, and has been for about four years. |
Darth Beaver Send message Joined: 20 Aug 99 Posts: 6728 Credit: 21,443,075 RAC: 3 |
The kitties just keep throwing lots of darts.....LOL. me and the Kitty man are throwing darts big 1's with explosive tips |
Spiked Punch Send message Joined: 8 Dec 01 Posts: 14 Credit: 48,927,213 RAC: 0 |
Or as some of us fondly (NOT) call it, CreditScrewed. + Rndm# Just keeping in the spirit of things. |
HAL9000 Send message Joined: 11 Sep 99 Posts: 6534 Credit: 196,805,888 RAC: 57 |
The title of this thread seems to refer to Astropulse credit. I didn't think that was affected by credit new. When Astropulse v7 is released the screams will begin a new I expect. SETI@home classic workunits: 93,865 CPU time: 863,447 hours Join the [url=http://tinyurl.com/8y46zvu]BP6/VP6 User Group[ |
Oz Send message Joined: 6 Jun 99 Posts: 233 Credit: 200,655,462 RAC: 212 |
When Astropulse v7 is released the screams will begin a new I expect. Astropulse V.... 7... ???!!!!! Ooooooooooooooh noooooooooooooo! Member of the 20 Year Club |
juan BFP Send message Joined: 16 Mar 07 Posts: 9786 Credit: 572,710,851 RAC: 3,799 |
When Astropulse v7 is released the screams will begin a new I expect. That´s one of the paradox of creditscrew, more optimized your apps is, less credit we gain. We humans expect exactly the opositive. Unless Jason´s and his team fix creditscrew before the lounch of AP 7, we all could expect a big fall in the credit paid by the AP work. But at least we could have a gain, the balance AP vs MB paid could be restored or reduced to a more friendly numbers. Fingers crossed. BTW I still hate creditscrew. |
Cosmic_Ocean Send message Joined: 23 Dec 00 Posts: 3027 Credit: 13,516,867 RAC: 13 |
The title of this thread seems to refer to Astropulse credit. I didn't think that was affected by credit new. It is. I kept a spreadsheet of all the AP tasks I have been given since CreditNew began (I remember the days of APs being awarded 1294.84 no matter what). My observations of it is that it seems to generally hover in the 650-750 range about 90% of the time, but then that other 10% of the time.. it can range from as low as 10 to as high as several thousand with no rhyme or reason behind it. Interestingly, maybe it was just a total coincidence, but occasionally, I would be awarded 3-400 on one task, and then a few tasks later I would be awarded 900-1100 to offset the low one. That was all on CPU crunching and had a couple thousand tasks of consistency to help smooth things out. From my understanding, the large variations in granted credit seem to happen more frequently on GPUs where the run times can vary in much larger margins than on a CPU alone. Linux laptop: record uptime: 1511d 20h 19m (ended due to the power brick giving-up) |
James Sotherden Send message Joined: 16 May 99 Posts: 10436 Credit: 110,373,059 RAC: 54 |
I had an AP pay me 9 credits one time. [/quote] Old James |
Darth Beaver Send message Joined: 20 Aug 99 Posts: 6728 Credit: 21,443,075 RAC: 3 |
James ask Mark if he has any spear darts for you i live to far away sorry |
kittyman Send message Joined: 9 Jul 00 Posts: 51468 Credit: 1,018,363,574 RAC: 1,004 |
I had an AP pay me 9 credits one time. I don't recall if it was MB or AP, but I do recall stories about NEGATIVE credits at one time....it was long ago. "Freedom is just Chaos, with better lighting." Alan Dean Foster |
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