Long WUs

vemec
vemec
Joined: 11 Aug 11
Posts: 3
Credit: 600726
RAC: 0
Topic 197600

Einstein keeps sending me long WUs that can't all be finished before the deadline. I've got some 45+ hour WUs running at the moment, two of which will miss the 7 June deadline. These WUs are coming in 'High priority' from the moment I receive them and are delaying work for other projects. Luckily LHC has no work for me at the moment - maybe because Einstein is hogging all my computing time. Please, somebody sort this out.

Claggy
Claggy
Joined: 29 Dec 06
Posts: 560
Credit: 2699403
RAC: 0

Long WUs

Quote:
Einstein keeps sending me long WUs that can't all be finished before the deadline. I've got some 45+ hour WUs running at the moment, two of which will miss the 7 June deadline. These WUs are coming in 'High priority' from the moment I receive them and are delaying work for other projects. Luckily LHC has no work for me at the moment - maybe because Einstein is hogging all my computing time. Please, somebody sort this out.


What are your cache settings? If you're getting too much work to be completed in time, then you're set the cache settings too high, and only you can lower them, a day or so should be sufficient.

Claggy

Gary Roberts
Gary Roberts
Moderator
Joined: 9 Feb 05
Posts: 5872
Credit: 117670019332
RAC: 35160577

RE: Einstein keeps sending

Quote:
Einstein keeps sending me long WUs that can't all be finished before the deadline.


I'm sorry, but there is no such thing as "long WUs". There are different science apps which may take different times, but for any one science app, the size of the tasks are pretty similar. With older architecture like your P4, the crunch times are going to be rather slow. The other point to realise is that Einstein doesn't send anything unless BOINC requests, so the real question is, "Why does BOINC request so much work?"

I notice that you received a whole bunch of work on 24th May in one big hit. Prior to that, you seem to have last requested work on 16th May. I also notice you have two apparently identical hosts listed, one running BOINC 6.12.43 which last contacted on May 7th, and one running BOINC 7.2.42 which did the big download on May 24th and is having trouble now. I assume these are the same physical machine and that you recently upgraded from 6.12.13 to 7.2.42, inadvertently getting a new host ID in the process. Your current machine shows as having been created on May 12th.

If these assumptions are correct, the most likely cause of your problems is the work cache computing preference settings which you should check and change if needed. If you check the Network Usage section of your computing prefs, the first two you find are the ones that control the amount of work you download. With the advent of BOINC V7, the meaning of these two has changed. This is something the BOINC Devs did at the time when V7 was released.

The first setting (Computer is connected ...) controls the 'low water mark', ie, the minimum amount that will be maintained at all times. The second setting (Maintain enough work for an additional ...) controls how much extra on top of the minimum will be asked for. So unless you want your cache of work to jump up and down through a large range, you should set the first number to be your required cache size (say 5 days) and the second number to a very low number (say 0 days). This would give you 5 days of work at all times with regular top ups as required to maintain that number. If you have these settings the other way around (I suspect you may have something like 0/10), your host won't ask for any work until the cache is empty (0 days) and will then ask for a big hit (10 days) all at once. It would be the last ones of this big hit that are now having deadline problems.

Quote:
- maybe because Einstein is hogging all my computing time.


Einstein cannot hog anything. BOINC is in control and is just trying to follow your wishes.

Quote:
Please, somebody sort this out.


Unfortunately, only you can fix this by adjusting your prefs. If the above analysis of the situation is not correct, please respond with the details of the work cache settings you are actually using.

Cheers,
Gary.

vemec
vemec
Joined: 11 Aug 11
Posts: 3
Credit: 600726
RAC: 0

Thanks, Gary and Claggy for

Thanks, Gary and Claggy for pointing me in the right direction. My prefs seemed OK, but my account showed I had three computers (I wish)! They were, of course all the same machine - one running the original XP Pro, one after I upgraded to Windows 7 Home Premium, and one when I had to do the upgrade again because of corruption problems. Having merged two and deleted the other, BOINC now has the right information, so I should'nt get the problem again.

Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.