Posts by oldWing

1) Message boards : Number crunching : More WUs simultaneously (Message 90319)
Posted 8 Feb 2019 by oldWing
Post:
CPUs with multiple cores and hyperthreading can run multiple WUs at the same time. If that increases the temperature of the CPU then it may throttle the clock rate to avoid exceeding the maximum thermal design power (TDP) of the chip. The result would be fewer models completed per thread in a given time period. If you are running eight WUs at once and throttle back by 15% then you are still getting a lot more work done overall.
2) Message boards : Number crunching : Two different tasks, same name? (Message 76721)
Posted 14 May 2014 by oldWing
Post:
Many BOINC projects involve complicated calculations that are easily verified, e.g factoring large numbers. Just multiply the (alleged) factors and the answer is either right or wrong. That makes it easy to toss bogus results that an evil participant might return.

My understanding of Rosetta is that everyone takes a random walk through the space of possible answers while trying to get closer to the expected answer. Since the models aren't perfect and the calculations involve rounding errors, there won't be a "correct" answer that is exactly right. Although it is relatively easy to measure how close a result is to the expected values, there is no practical way to determine the closest possible answer that the model might generate. Thus the same task is farmed out multiple times and the closest result is accepted.
3) Message boards : Number crunching : Can't get tasks! (Message 76604)
Posted 9 Apr 2014 by oldWing
Post:
fyi: The stupid mistake I make from time to time is running low on free disk space. BOINC will go through the motions of requesting tasks, but it won't get any (nor mention why) if the free space you've specified in BOINC Manager is not available.
4) Message boards : Number crunching : Rosetta@home FAQs - They are soooo out of date! (Message 75502)
Posted 27 Apr 2013 by oldWing
Post:
Well, I heard that a follow-on to Windows XP came out. Perhaps the Recommended System Requirements could get a refresh. (Recommended requirements? Is that vague enough?)

IIRC, there was also a BOINC update in the last decade.
5) Message boards : Number crunching : Looking For Work (Message 75258)
Posted 19 Mar 2013 by oldWing
Post:
We have a winner! Thanks slicedbread. The >100GB of underwater photographs taken on vacation didn't leave enough free space. A little housecleaning fixed things. I would have expected BOINC to get work, but not run the tasks, if there was insufficient space. Or at least note the problem in the Event Log.

mikey: As shown in the original post, I did try both Update and Reset project in BOINC Manager. They requested tasks, but none were downloaded.

Looks like another opportunity to improve the diagnostics in BOINC.
6) Message boards : Number crunching : Looking For Work (Message 75252)
Posted 18 Mar 2013 by oldWing
Post:
Having recently returned from vacation I'm trying to resume processing Rosetta tasks. One PC has found work to do immediately, the other hasn't.

The BOINC Manager Event Log shows that the bored system is requesting work:

3/18/2013 3:03:55 PM | rosetta@home | Sending scheduler request: To fetch work.
3/18/2013 3:03:55 PM | rosetta@home | Requesting new tasks for NVIDIA GPU
3/18/2013 3:03:57 PM | rosetta@home | Scheduler request completed: got 0 new tasks
3/18/2013 3:20:10 PM | rosetta@home | Sending scheduler request: To fetch work.
3/18/2013 3:20:10 PM | rosetta@home | Requesting new tasks for CPU
3/18/2013 3:20:12 PM | rosetta@home | Scheduler request completed: got 0 new tasks
3/18/2013 3:20:12 PM | rosetta@home | No work sent


The Rosetta Computer summary page for the host (http://boinc.bakerlab.org/rosetta/show_host_detail.php?hostid=1430484) shows that the host keeps contacting the server. The Rosetta home and Server Status pages appear to show plenty of jobs waiting. The BOINC Manager project Update and Reset project commands haven't helped. The project is neither suspended nor set to not request new tasks.

Any troubleshooting suggestions? Or a link to the sticky "Troubleshooting - Not Getting New Tasks" topic?






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