438174824

437352894

437591625

437299933


Everybody who runs them errors out....

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They had a bad run on some of the tapes. It's been discussed here on a couple of threads already.

At least they are dieing a quick death. :)

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PROUD MEMBER OF Team Starfire World BOINC

That is good to know, in the back of my mind I was a little worried......heh

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At least they cause negligible delay.

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At least they cause negligible delay.

Except for special circumstances....

With my dial-up connection at its best, an AP_v5 WU takes about 25 minutes to download. The one I got April 28 was like that, I think. I had some previously downloaded MB work running, so the AP_v5 went at the end of the queue. Around 4 am the next morning its turn came and went in 7 seconds. The phone line was of course configured as a phone line at that time...

So when I got up I found that host idle, after going online I saw that the project was in difficulty so put off trying for more work until afternoon when downloads started flowing again. The error reported, the Scheduler assigned another AP_v5. With the S@H download pipe still maxed, that one took a total of about an hour of download time, with several backoffs from HTTP errors and timeouts that was about 9 hours of wall time. Murphy was there, that one also had the problem and crunched in 6 seconds.

After that I got some MB work, so it was only about 18 hours of idle time. The day was not the kind I like, but interesting nevertheless. I'm not complaining, it's rather amusing in retrospect.

There's another aspect which is more generally applicable. Each one of those WUs will go to at least 7 hosts. Since an 8 MB file is 64 MBits, 3 downloads occupy the full download bandwidth for 2 seconds. The ones I've seen reported so far happened on tapes from 12mr through 20mr and counting up the 'tapes' in that range suggests there are at least 10000 of the bad WUs. They'll be spread out over time so won't tie up all download bandwidth for 1 hour and 51 minutes, but are still wasting part of a somewhat limited resource.

                                                             Joe

Josef, You might want to refigure. It's not quite that bad. It appears it is only one track on the tapes from those dates. The rest of the tracks are ok.

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PROUD MEMBER OF Team Starfire World BOINC

Josef, You might want to refigure. It's not quite that bad. It appears it is only one track on the tapes from those dates. The rest of the tracks are ok.

Yes, I know, but one channel of a 50.20 GB 'tape' yields about 400 AP_v5 WUs and there are 25 such (plus a few more shorter 'tapes'). OTOH there's no absolute certainty that all 25 are affected, it might be some kind of intermittent which comes and goes. In any case, the other 130000 WUs from those dates ought to be fine.

                                                                Joe

Yup I had one of those too. Pity they are still being rescheduled out to even more unfortunates.

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