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Number crunching :
Theoretical Scheduling Question
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Author | Message |
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eberndl Send message Joined: 12 Oct 01 Posts: 539 Credit: 619,111 RAC: 3 |
With the new (4.43) client is it possible that at some time there will be projects up, but no projects that are "legal" to d/l new work? I am currently nearing that situation... Predictor is currently out of WUs, and all of my other projects have negative debt and will not d/l. I still have a CP unit on my computer and with almost 700 hours to complete, I'm not actually going to have to deal with this situation, but does anyone know if there is a "fail-safe" for this situation. I'm currently attached to 6 projects, but really it doesn't matter how many you are attached to if the only one that can "legally" d/l work has none to give out. Thoughts?? |
John McLeod VII Send message Joined: 15 Jul 99 Posts: 24806 Credit: 790,712 RAC: 0 |
With the new (4.43) client is it possible that at some time there will be projects up, but no projects that are "legal" to d/l new work? Yes, and no. The override for retrieving from Positive LT debt projects is when a CPU is idle. At this point, the scheduler is supposed to contact any project it is attached to that is not being deferred, has not been suspended, and has not been tagged as no work download by the user. In this case, however, the WUs will be requested one at a time so that the resource sharing will be pushed as little out of balance as possible. When the positive debt projects come back, they should be asked for new work. The only problem with this is it is a bit hard on modem users when lots of projects are dry for a spell. BOINC WIKI |
Raven Send message Joined: 28 Aug 02 Posts: 373 Credit: 99,071 RAC: 0 |
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eberndl Send message Joined: 12 Oct 01 Posts: 539 Credit: 619,111 RAC: 3 |
Thanks for the info... I don't have to worry unless there's no work from Predictor for 11 or so days, so it's not ACTUALLY a problem in the near future... but it is important to know what happens in these odd situations... Thanks again. |
John McLeod VII Send message Joined: 15 Jul 99 Posts: 24806 Credit: 790,712 RAC: 0 |
Thanks for the info... I don't have to worry unless there's no work from Predictor for 11 or so days, so it's not ACTUALLY a problem in the near future... but it is important to know what happens in these odd situations... THis will be somewhat fixed in 4.44 as projects that are suspended, or are deferred and have no work on the system, or you have requested no more work and they have no work on the system will not accrue LT debt. This extends the time before there is a problem. BOINC WIKI |
John McLeod VII Send message Joined: 15 Jul 99 Posts: 24806 Credit: 790,712 RAC: 0 |
Right now I'm just having fun with the fact that my scheduler thinks that CPDN alone is enough for my system to handle, and as such won't d/l anything from anywhere else for now. Since a large number of projects are down at the moment, most of the problem is likely to be that instead of the scheduler. However if your queue is large enough, you will always be running earliest first and ignoring CPDN until all other projects have no work and have negativ LT debt, at which point CPDN gets its turn to crunch. BOINC WIKI |
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