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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
In the last round of MCM betas I noticed some strange behaviour of the way points are claimed by my old P4 machine. (I wasn't sure whether to put this in the beta forum or not, but I suspect it's general so put it here.)
Here are the details of 3 WUs for your delectation: BETA_ MCM1_ 0000218_ 1396_ 2-- DESKSIDE Valid 14/12/13 14:22:11 16/12/13 10:46:39 43.15 / 44.40 513.8 / 457.9 BETA_ MCM1_ 0000218_ 9690_ 0-- DESKSIDE Valid 10/12/13 14:15:09 12/12/13 19:22:35 48.81 / 52.71 114.1 / 284.9 BETA_ MCM1_ 0000216_ 8037_ 0-- DESKSIDE Valid 13/12/13 07:39:26 16/12/13 05:57:07 69.02 / 70.24 112.0 / 263.1 What appears to be happening is that, as soon as the runtime gets beyond 48 hours, the points claim drops dramatically. Even the points awarded drop from the usual of around 10/hr to 6 or even 4. I've been doing this long enough not to be upset by this, but it just looks so deliberate that I had to ask if there is a reason for it. Anyone? |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
It's anti cheat 'deliberate'. Some were manipulating the runtimes in a result header, so another cap was likely put in place for that condition. Had a 37 hour job that got that very 112 as claim value, the wingman too.
BETA_ MCM1_ 0000216_ 2302_ 1-- 728 Valid 12/13/13 02:54:11 12/15/13 10:10:40 35.33 112.0 / 112.0 BETA_ MCM1_ 0000216_ 2302_ 0-- 728 Valid 12/13/13 02:54:09 12/14/13 21:35:18 37.25 112.0 / 112.0 The device is common to fetch about 15-17 credit/hour... it got 3 in recognition of being a fraud suspect. It's of course another nail in the evidence coffin that Credit New [build and tested on a stable runtime alien search project], is not able to deal with variable runtimes, not from job to job, as is the common at WCG and very pronounced for CEP2 [had one cap removed some 1-2 weeks ago, after which CEP2 credit went really through the floor] and MCM of course. No Apis, my opinion about the credit system is absolutely not harsh [as you deemed mine to be], it's totally cool with me in fact ![]() |
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uplinger
Former World Community Grid Tech Joined: May 23, 2005 Post Count: 3952 Status: Offline Project Badges: ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
Apis,
This is just a credit issue. It looks some normalization was run on the claimed credit. It looks as though you were granted greater credit than you claimed. We will be bringing up these extremely long running MCM1 work units with researchers as they mess with the estimated flops needed for work units. In an ideal world, the work units would be extremely easy to predict the sizes. Also, I will be turning the assimilator on for BETA soon which should clear out some old results sitting in your Results Status page. Thanks, -Uplinger |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
Thanks for your responses guys.
Rob: The anti-fraud idea seems reasonable, but if so I would suggested that it's poorly implemented. Keith: I agree that the WUs that ran over 48hrs on my machine were granted more than they claimed. But I would comment that (a) the claim was unreasonably low in the first place and (b) the wingmen ran for less than 48 hours in both cases, so their claims were "normal" -- what happened was that my machine caused theirs to be granted less than they deserved. If this behaviour is as expected then that's fine by me, but if the situation is being reviewed then I'm happy simply to provide a little input to the discussion. Once again, thanks for your attention. |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
Right, how poorly implemented would anyone like it to show before someone takes hammer and stick to help that crappanism out of it's misery? CEP2 credit dropped to an average of 14.6 per hour yesterday and the 7 day [smoothed] average, removing the outliers, to 16. See a correlation between runtime and credit? Then of course we're now computing all 16 jobs and not maxing out at 12 as was the case in the previous year or 2... and in a 3rd of the time.
----------------------------------------This system was designed for steady runtimes, and 'that' is not what we have at WCG, not from job to job, not from week to week, not from batch to batch, and not when the amount of work packed to tune the 'average' run time is changed [the technician's feeder-cutter]. Picture what's potentially coming when the dynamic sizing-to-power comes and all credit is still being pooled in one science pot [Hope techs anticipated on that]. Edit: Remains that specific question, why 3 tasks of the top 2 posts that lasted 37 hours and more had a 'claim' of 112 and 2 in a quorum got that as grand too with a 3 credit per hour where the 'normal' many time that. No one thinking this is a little more than very suspect? ![]() ![]() [Edit 1 times, last edit by Former Member at Dec 20, 2013 9:58:10 AM] |
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