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World Community Grid Forums
Category: Support
Forum: Suggestions / Feedback
Thread: DDDT/FAAH Minimum Redundancy - Initial device reliability testing [Answered] |
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Thread Status: Active Total posts in this thread: 5
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Rickjb
Veteran Cruncher Australia Joined: Sep 17, 2006 Post Count: 666 Status: Offline Project Badges: 
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----------------------------------------[Edit] Answer: "15 or so" consecutive valid WUs, and they can be from any WCG project, not just the quorum-of-1 projects (DDDT/FAAH) - BOINC: Deadlines for Standard & Rush Tasks and What Clients Get These A few days ago, I started up a new device, with FAAH and DDDT projects selected. (No DDDTs were available - Hurricane Ike). At time of posting, it had crunched 31 FAAH WUs, all with a quorum of 2. The number validated lagged behind the number returned, so I crunched 16 extra WUs with a quorum of 2. Crunching these extras would not have advanced the FAAH project because another device had to validate each, unless the other device was also being tested. If the latter was true, I'd expect some of my WU names to end in "1", ie I'd be testing the other guy, but they all ended on "0". (Such a system would be OK provided that the chance of 2 machines returning the exact same invalid data was negligible). The smart thing to do when establishing that a new or distrusted device is reliable ("on probation") is to crunch only WUs from WCG projects other than the ones that use a quorum of 1 (aka single redundancy), ie not DDDT or FAAH at this time. When 15 ("or so") of these WUs have been validated, you can introduce the single-redundancy projects (DDDT/FAAH) to your mix without them always incurring a quorum of 2. More Questions: - When a reliable device ("A") is assigned to validate a WU from an apprentice device ("B"), is this used as part of the routine random testing of A, ie will the duplication of effort not really be wasted since A was going to be tested anyway? [Edit] Unsure, but the testing system seems to be random. Use probation strategy above if you're concerned. Consider my "wasted" WUs a donation to the testing program. - (Am I the only one who can't find stuff on this website, or are the search facilities really hopeless?) [Edit] No answer, but I've bookmarked The Start Here Forum Frequently Asked Questions Index in WCG>>Forums>>My Forum Profile>>My Favorite Threads, and also in my browser  [Edit 4 times, last edit by Rickjb at Oct 27, 2008 3:01:57 PM] |
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Sekerob
Ace Cruncher Joined: Jul 24, 2005 Post Count: 20043 Status: Offline |
hmmm, did u use "advanced" search center top of the forum screens for the word "reliable" and filtering on Start Here forum only?
----------------------------------------http://www.worldcommunitygrid.org/forums/wcg/...=&forum=3&rows=20 No DDDT, thus only FAAH to crunch and if indeed it powwows through FAAH jobs, you don't tell how many it did in a day, the randomicity will cause for verification jobs to be send until you've reached that magic 15 validations in a series. If concerned over project efficiency, which was 2.2 and now about 1.2 for DDDT/FAAH, then 'training' on HPF2 or RICE would have been the "smartest" choice. Other than that, I'd not worry about it. Question for you: Did those verification jobs with _1 suffix get a rush due date (about 2.4 days) or did they get a regular due time? If so, the backup jobs go to any random device, not just the already "reliable". ttyl PS The reliability number is x-project.
WCG
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Sekerob
Ace Cruncher Joined: Jul 24, 2005 Post Count: 20043 Status: Offline |
PPS, the Start Here FAQ index has a specific topic 1Q pointing to a topic touching on "reliability".
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WCG
----------------------------------------Please help to make the Forums an enjoyable experience for All! [Edit 1 times, last edit by Sekerob at Oct 27, 2008 11:05:02 AM] |
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Rickjb
Veteran Cruncher Australia Joined: Sep 17, 2006 Post Count: 666 Status: Offline Project Badges:
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Thanks for your reply, Sek. Hmmm ... can't find an "advanced search" button anywhere; just "Search" at top centre and also at top right. I guess the centre one is "advanced". How about "less dumb"? When multiple words are entered, does it search for the phrase, or the individual words? If the words, is it ALL the words or ANY OF the words? Titles or content? The search result pages do not show the string sought, unlike the Master of searching. Search instructions would be more useful on the search form page or via a button thare, than in an FAQ that you have to search for ...
---------------------------------------- (I know WCG plan to upgrade the forum software, but I hope they do some research first & get the best affordable).You've provided info which has answered my questions, and I have edited them into my post for the benefit of other readers. I've also added your Start Here Forum Frequently Asked Questions Index to my Favourite Threads and browser bookmarks. ... FAAH jobs, you don't tell how many it did in a day Res. Status shows 10 but I thought more.'training' on HPF2 or RICE would have been the "smartest" choice. or HCC, ie any project other than the ones that use a quorum of 1 (aka single redundancy). HCC has shortest validation times because you have to wait for only 1 other cruncher. I do like to ensure that my crunching is used as efficiently as possible. I've also noticed that some others get a bit upset if they waste a few WUs. Crunchers with slower machines seem particularly sensitive, because they've wasted many CPU hours. Maybe this training strategy deserves a place in an FAQ - or perhaps it could even happen automatically. Running at least 1 WU from each active project would be the most exhaustive test scheme though.Question for you: Did those verification jobs with _1 suffix get a rush due date (about 2.4 days) or did they get a regular due time? If so, the backup jobs go to any random device, not just the already "reliable". I got only 1 "_1", with regular date, and it arrived 1st in a batch of 3, along with the first 2 quorum-of-1 WUs. So, "inconclusive".BTW, the "A Letter to help you with Recruiting New Members", posted Apr 20 05, is a bit outdated. [Edit 1 times, last edit by Rickjb at Oct 26, 2008 10:53:16 AM] |
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Sekerob
Ace Cruncher Joined: Jul 24, 2005 Post Count: 20043 Status: Offline |
If you search on "advanced search" with quotation marks included in the search string, I think you'll find your own post right away top of the list, that is if the DB search index has been updated again, which I think is not instantaneous. The search now gives about 15 hits for that phrase and "less dumb" might give an even narrower result :D
----------------------------------------We have an FAQ for Forum Search and Navigating too, item 7D in the "How too" FAQ index. :D And, our FAQ index is regularly expanding and at times gives multiple topics with different catch words pointing to the same FAQ to increase the hit chance. Have a nice day.
WCG
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