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World Community Grid Forums
Category: Completed Research
Forum: GO Fight Against Malaria
Thread: CPU time higher than elapsed time |
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Thread Status: Active Total posts in this thread: 16
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nanoprobe
Master Cruncher Classified Joined: Aug 29, 2008 Post Count: 2998 Status: Offline Project Badges: 
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I was looking at my WUs running with boinctasks and I happened to notice 1 running at 100% efficiency. When looking at the properties for that WU I notice CPU time was higher than elapsed time. How does that happen?
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In 1969 I took an oath to defend and protect the U S Constitution against all enemies, both foreign and Domestic. There was no expiration date.
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sk..
Master Cruncher http://s17.rimg.info/ccb5d62bd3e856cc0d1df9b0ee2f7f6a.gif Joined: Mar 22, 2007 Post Count: 2324 Status: Offline Project Badges: 
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Definitely one for the techs, but I would speculate that it's something to do with the final jobs Run Time tallying finishing after the tasks Run Time stops. Run time starts when the task is just loading, before it runs, so CPU time starts several seconds after Run Time, a fair bit to catch up on. However, if CPU time is measured as the sum of each 'cpu time used' for each job, but does not end until the last job is written to disk, perhaps this write time is longer than the loading time.
Whatever the answer, I would also like to know... |
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Mysteron347
Senior Cruncher Australia Joined: Apr 28, 2007 Post Count: 179 Status: Offline Project Badges: 
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Sure it's not a side-effect of running LHC@Home?
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nanoprobe
Master Cruncher Classified Joined: Aug 29, 2008 Post Count: 2998 Status: Offline Project Badges:
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Sure it's not a side-effect of running LHC@Home? Don't run LHC@Home.
In 1969 I took an oath to defend and protect the U S Constitution against all enemies, both foreign and Domestic. There was no expiration date.
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Dark Angel
Veteran Cruncher Australia Joined: Nov 11, 2005 Post Count: 728 Status: Offline Project Badges: 
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That was a reference to a certain faster than light particle discovered recently, I would suggest.
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
Something I've been observing after a task/client restart. On Friday, after a boot, saw this on 3 of 4 jobs of the quad [6.12.33]. The bug of client loosing time was at one time quite large [did report and was fixed in next version], but now the minute does not bother me.
------------------------------------------//-- edit: Was elapsed btw and caused other cached work to get too short ttc's and hence overcaching, since clients since *elapsed* was introduced use that as the projection time. [Edit 1 times, last edit by Former Member at Nov 20, 2011 7:40:08 AM] |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
Sure it's not a side-effect of running LHC@Home? Some neutrinos running at faster-than-light speed may have been picked up by the CPU.  |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
 I wonder if this happens on projects that have 2 different programs for the same work unit?  Lawrence |
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Bearcat
Master Cruncher USA Joined: Jan 6, 2007 Post Count: 2803 Status: Offline Project Badges: 
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I am seeing about 4 to 5 minutes loss on CPU time (lower) vs actual time (higher). Running this on a hex X5650-10 threads using ubuntu 11.4. Hoping it doesnt grow more when I turn my dual hex PC on this project in the near future. Anyone seeing this?
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Crunching for humanity since 2007!
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nanoprobe
Master Cruncher Classified Joined: Aug 29, 2008 Post Count: 2998 Status: Offline Project Badges:
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I guess this is not an anomaly. I just checked again and I have 11 more WUs showing 100% efficiency across 3 machines.
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In 1969 I took an oath to defend and protect the U S Constitution against all enemies, both foreign and Domestic. There was no expiration date.
----------------------------------------[Edit 1 times, last edit by nanoprobe at Nov 27, 2011 2:13:40 PM] |
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