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World Community Grid Forums
Category: Support
Forum: BOINC Agent Support
Thread: The Why of: Increase runtime for BOINC work units 9/25/2007 |
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Thread Status: Active Total posts in this thread: 5
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Sekerob
Ace Cruncher Joined: Jul 24, 2005 Post Count: 20043 Status: Offline |
Posted by uplinger at Sep 25, 2007 3:36:09 PM in Member News: Does one understand.... a little educated guessing?Increase runtime for BOINC work units 9/25/2007 Greetings, We are increasing the runtime of the BOINC work units. Previous average runtimes: DDD-T 6.3 Hours FAAH 5.5 Hours HPF2 5.5 Hours We have increased the lengths to be closer to a 7 hours average. This means that DDD-T work units will appear to run 10% longer. FAAH and HPF2 will appear to run 25% longer than before. Thank you for participating in World Community Grid! -Uplinger Q: How is work extended so easily? A: Pack more attempts in Work Units! Q: How to establish that? A: Those who've activated the Checkpoint Debug option will see more entries in the message log. Q: Why doing this? A: Reduce loads on certain elements of the server processes like Schedulers, Feeders, Validators, Transitiors etc Q: Why now? A1: With load reductions in quantitative terms, size per dataset not an issue, a probable ramp-up for the next project addition to run concurrently. A2: To make space for the strong growth seen post holiday season and college restarts. Q: Anything else? A: Enjoy conjecturing.... need to run.
WCG
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
Q: How is work extended so easily? A: Pack more attempts in Work Units! I'm still a little unclear about what is "packed" in each WU. I know more info is coming regarding DDDT. Does that mean FAAH WUs are more than just 1 ligand --> 1 protein? If so, how many ligands per WU now? If not, I don't quite understand what exactly lengthening or shortening the runtime of a WU is actually doing. What do you mean by an "attempt"? For HPF2, I'm assuming that means more structures folded per protein in a given WU? Sorry for all the questions, and many thanks for any answers  I'm a nerd for the nitty-gritty details for what we're crunching  [Edit 1 times, last edit by Former Member at Sep 25, 2007 8:50:28 PM] |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
Hello esoteric17,
Each ligand can be flexed into many different shapes and each shape can be presented to the protein target from many vectors and orientations to see how well it docks. So each ligand has many attempted dockings. Similarly, there are an almost infinite number of shapes that HPF2 can try for a given protein. Nature has no trouble choosing a unique shape because even small changes in an atom's position can result in a noticeable change in energy levels. However, a computer cannot feel the atomic force fields so it changes the position slightly and then recomputes the energy levels. Therefore, FAAH, DDDT and HPF2 make numerous 'attempts' in each work unit. The number of attempts is chosen when creating the work units on the server. More attempts per work unit mean fewer work units overall per ligand / protein. The total computer time remains constant even though the number of work units shrink. Lawrence |
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retsof
Former Community Advisor USA Joined: Jul 31, 2005 Post Count: 6824 Status: Offline Project Badges: 
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My concern is that my slowest 0.5GHz Pentium III computer has been unhappy since the short WU GC project ended. It has been taking 30-36 hours for a FAAH. This change means that it will be nearly 2 days per workunit....hardly worth the heat buildup here, except for a lot of points eventually.
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Sgt.Joe
Ace Cruncher USA Joined: Jul 4, 2006 Post Count: 7851 Status: Offline Project Badges: 
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It is about the same for DDDT on my .397ghz. 30 - 35 hours, but at least the heat helps keep my basement warm.
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Sgt. Joe
*Minnesota Crunchers* |
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