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mclaver
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Long Running Work Units

I know about the long running work units on FIghtAids but I now have a bunch of NutRice work units that show 46 hours. I have never had any this long. This machine is a Q9450 so it is not a slow machine. Does anyone know if NuRice is having the same problem as FitghAids
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Sekerob
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Re: Long Running Work Units

Forget what you see. Your RICE jobs will run 8 hours and a few seconds , not more. The client is confused because it got these mispredicted FA@H jobs that took 5x longer than normal.
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[Edit 1 times, last edit by Sekerob at Aug 2, 2008 8:47:37 PM]
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mclaver
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Re: Long Running Work Units

I hope you are right becasue I am getting very discouraged today at losing work becasue of long running tasks being canceled becasue of exceeding cpu and no credit, on FightAids, as you have seen from my post over there.
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Sekerob
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Re: Long Running Work Units

I KNOW I am right and would freak if they would not. They have an in-build routine to finish the seed/structure that goes over the 8 hours CPU time exactly. That takes depending on machine speed and complexity of seed 1 to several minutes.
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[Edit 1 times, last edit by Sekerob at Aug 2, 2008 9:42:49 PM]
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mclaver
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Re: Long Running Work Units

Ok, I checked up on you. All of my completed NuRice are about 8 hours no matter what machine I run them on. So you must be right!

The particular machine that now has 10 NuRice queued up at over 46 hours only processed on FIghtAids for 27 hours. Is that enough to mess up the completion times for all projects? When will things get back to normal.

Thanks for all of your help today.
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JmBoullier
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Re: Long Running Work Units

Is that enough to mess up the completion times for all projects? When will things get back to normal.

Yes it's enough. The Duration Correction Factor (DCF) is pushed up full size immediately when the duration of a WU was underestimated. This is probably done for avoiding to overload your work queue if the new duration is not an accident, i.e. if all new WUs to come are so much bigger.

When the duration of a WU has been overestimated by more than 10 % the DCF will be lowered by 10 %. If it was overestimated by less than 10 % the DCF will decrease by only 1 %.

If your machine is crunching correctly sized WUs from now on (e.g. Rice or HCC, currently) the DCF should be back to a more reasonable value after about a dozen of these WUs have completed. In your case when your 10 Rice WUs will be finished the DCF should be close to 2 instead of the current 5.75. And it will go on decreasing with each new WU which had been correctly estimated, although the adjustment will be slower as the DCF comes closer to what it was normally.

The above description is meant to give you the principle of this mechanism. Since I am not a Boinc developer I do not guarantee its accuracy but you get the spirit. smile

Cheers. Jean.
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[Aug 3, 2008 12:20:40 AM]   Link   Report threatening or abusive post: please login first  Go to top 
mclaver
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Re: Long Running Work Units

Thanks for your description of how it works, I will not worry about it and assume it will get back to its correct calcuations in a couple of days after this bad batch of FightAids gets through the system.

- Mitch
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[Aug 3, 2008 12:46:00 AM]   Link   Report threatening or abusive post: please login first  Go to top 
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Re: Long Running Work Units

I have had a whole batch of these jobs and all of them finished right about 8 hours no matter what the original estimate was.
[Aug 3, 2008 2:09:38 AM]   Link   Report threatening or abusive post: please login first  Go to top 
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Re: Long Running Work Units

Quick question. If you alter the duration correction factor manually in the configuration files will it keep you from having to wait for 10+ WUs to get back to normal?

Thanks,
Faldor
[Jan 23, 2009 5:50:14 PM]   Link   Report threatening or abusive post: please login first  Go to top 
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Re: Long Running Work Units

Hello faldor,
Sure. Dangerous if you don't know what you are doing. So exit BOINC, apply change, restart BOINC. And be prepared to change back if you mess up.

Lawrence
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