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World Community Grid Forums
Category: Active Research
Forum: Mapping Cancer Markers Forum
Thread: Am I confused, or is your task dispenser confused. |
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Thread Status: Active Total posts in this thread: 4
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Jean-David Beyer
Senior Cruncher USA Joined: Oct 2, 2007 Post Count: 339 Status: Offline Project Badges: 
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I was running a task and it completed. I then got what appears to be the same task and I completed that one too. They did not take the same amount of time. But It had a Quorum of 2 and a Replication of 2. Now if my machine made the same error both times (I do not believe it made any), this "test" would give misleading results, right?
----------------------------------------Workunit Status Project Name: Mapping Cancer Markers Created: 09/20/2016 19:55:11 Name: MCM1_0126176_1663 Minimum Quorum: 2 Replication: 2 Result Name OS type OS version App Version Number Status Sent Time Time Due / Return Time CPU Time / Elapsed Time (hours) Claimed/ Granted BOINC Credit MCM1_ 0126176_ 1663_ 1-- Linux 2.6.32-642.4.2.el6.x86_64 736 Valid 9/22/16 02:58:19 9/22/16 19:09:09 4.70 111.8 / 108.9 MCM1_ 0126176_ 1663_ 0-- Linux 2.6.32-642.4.2.el6.x86_64 736 Valid 9/22/16 02:57:32 9/22/16 08:59:52 2.59 106.0 / 108.9  |
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Sgt.Joe
Ace Cruncher USA Joined: Jul 4, 2006 Post Count: 7849 Status: Offline Project Badges: 
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It was probably just chance you ended up with both replications of the same unit. Considering the close to 3 *10^9 units which which have been processed, the chances of the same machine getting both replications of the same unit would be very small, but not zero. What amazes me is that you actually noticed that it happened. As to why it took differing amounts of time on the same machine, perhaps other process were happening when the slower one was processed - i.e. you were simultaneously using the machine for other work. If I were you, I would not worry about it.
----------------------------------------Edit: See Sekerob's explanation below. I should have realized the source of the OP's listing of the work units. If a picture of the completed units had been posted listing the computer name, I would not have made the erroneous assumption I did. Cheers
Sgt. Joe
----------------------------------------*Minnesota Crunchers* [Edit 1 times, last edit by Sgt.Joe at Sep 23, 2016 11:28:49 AM] |
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SekeRob
Master Cruncher Joined: Jan 7, 2013 Post Count: 2741 Status: Offline |
"I then got what appears to be the same task and I completed that one too."
----------------------------------------Result Name OS type OS version App Version Number Status Sent Time Time Due / Return Time CPU Time / Elapsed Time (hours) Claimed/ Granted BOINC Credit MCM1_ 0126176_ 1663_ 1-- Linux 2.6.32-642.4.2.el6.x86_64 736 Valid 9/22/16 02:58:19 9/22/16 19:09:09 4.70 111.8 / 108.9 MCM1_ 0126176_ 1663_ 0-- Linux 2.6.32-642.4.2.el6.x86_64 736 Valid 9/22/16 02:57:32 9/22/16 08:59:52 2.59 106.0 / 108.9 The analysis does not add up, since the time of issue is just 47 seconds apart (bolded timestamps). But anyway, it's as sure as sure can be that one computer did not do both results. On the quorum detail page, where the distribution was copied from, 'your' copy appears in pink, and the wingman's are in white **. If you had both, both would be pink. Also, all tasks that a member completed and got credit for, are listed on the Result Status main page. Are they, _0 and _1? ** Notice how the computer name is absent on the quorum detail page, as WCG is not going to tell who your wingman was, hence the reason for highlighting (not a visually impaired friendly manner). [Edit 1 times, last edit by SekeRob* at Sep 23, 2016 6:33:16 AM] |
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Jean-David Beyer
Senior Cruncher USA Joined: Oct 2, 2007 Post Count: 339 Status: Offline Project Badges:
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So the coincidence I saw IS NOT that I did both work replications, which you show I could not have, but that my wing-man is running the exact same distribution and release of the Linux kernel. Linux 2.6.32-642.4.2.el6.x86_64 that is one that is current for Red Hat Enterprise Linux 6.9 for 64-bit Intel processors. While RHEL is a widely-used distribution for commercial users, I imagine it is pretty rare for desktop users.
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