Canceled "bad" BRP beams

Bernd Machenschalk
Bernd Machenschalk
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Occasionally we get data from Radio telescopes (usually Arecibo) that doesn't give any usable results when analyzed with our application. We have a few checks implemented in data pre-processing in order to not pass such data to the E@H clients at all, but occasionally a few slip through. All tasks from such a beam would end up as "validate error"s (not as "invalid"!). We do have methods to monitor such validate errors that accumulate on the WUs of single beams. In order to avoid wasting computing power on these, we need to cancel such workunits. Unfortunately this means that you won't get any credit for these tasks.

I set up this thread to notify you of such canceled beams.

BOINC does have a feature to notify clients of canceled workunits on scheduler contacts. However this feature is implemented in a way that, when enabled on E@H, grinds our database to a halt. So we decided not to enable it here.

BM

BM

Bernd Machenschalk
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Canceled "bad" BRP beams

I just canceled workunits of the following beams:

p2030.20150119.G66.66-00.73.N.b4s0g0.00000
p2030.20150119.G66.66-00.73.N.b5s0g0.00000
p2030.20150119.G66.66-00.73.N.b6s0g0.00000

BM

BM

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p2030.20150119.G66.66-00.73.N

p2030.20150119.G66.66-00.73.N.b3s0g0 doesn't seem to be a good one either:
http://einsteinathome.org/workunit/218422058
http://einsteinathome.org/workunit/218422081

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Bernd Machenschalk
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Yep. Been watching it for a

Yep. Been watching it for a while. Canceled

p2030.20150119.G66.66-00.73.N.b4s0g0.00000

as well.

BM

BM

Richard Haselgrove
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SETI receives data from the

SETI receives data from the same set of Arecibo antennae (7 channels, 2 polarities), and records them to its own recorder. Somewhere in the feed, we sometimes see a channel - B3_P1, in SETI terminology - which gets a bit stuck somewhere in the pipeline, and ruins that channel for sometimes weeks at a time (it seems to be seasonal). I have no way of knowing whether the fault is before or after the SETI feed is branched off the main PALFA source.

ExtraTerrestrial Apes
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It could be a good idea to

It could be a good idea to communicate with others which beams are bad. If not already done.. and if the definition of "bad" is similar enough across users.

MrS

Scanning for our furry friends since Jan 2002

Bernd Machenschalk
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We had to cancel WUs of

We had to cancel WUs of beam

p2030.20141111.G191.02-00.48.N.b4s0g0.00000

(after half a year of flawless operation).

The E@H pipeline is similar to the other pipelines of the PALFA collaboration. Aside from the actual E@H application we use the very same software ("PRESTO") that PALFA is using and which is specifically written and tuned for pulsar timing. I strongly doubt that this can be used for signals of any other type and thus that it has any similarity with what SETI does.

BM

BM

MAGIC Quantum Mechanic
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http://einstein.phys.uwm.edu/

http://einsteinathome.org/account/tasks&offset=0&show_names=1&state=4&appid=0

I only got a handful and considering the 450+ valids I got that is not all that far from a flawless operation.

Thanks for the info Bernd

 

Stranger7777
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O, I though that "PRESTO" is

O, I though that "PRESTO" is an old but good for those times engine of Opera browser until version 12.17 after which it became an another sloooow clone of Google Chrome.

Bernd Machenschalk
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We canceled the following

We canceled the following workunits of beam "p2030.20141111.G191.02-00.48.N.b3s0g0.00000":

p2030.20141111.G191.02-00.48.N.b3s0g0.00000_3665
p2030.20141111.G191.02-00.48.N.b3s0g0.00000_3691
p2030.20141111.G191.02-00.48.N.b3s0g0.00000_3695
p2030.20141111.G191.02-00.48.N.b3s0g0.00000_3699
p2030.20141111.G191.02-00.48.N.b3s0g0.00000_3772
p2030.20141111.G191.02-00.48.N.b3s0g0.00000_3790

It currently looks like that only these few workunits with rather high "job numbers" (>3600) are affected, so we didn't cancel the whole beam (yet).

BM

BM

Christian Beer
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We canceled the workunits for

We canceled the workunits for the following beams that accumulated a lot of validation errors:

p2030.20151021.G196.96+00.49.S.b6s0g0.00000
p2030.20151024.G197.22+00.50.N.b3s0g0.00000
p2030.20151029.G180.60-00.37.N.b4s0g0.00000
p2030.20151029.G180.60-00.37.N.b5s0g0.00000
p2030.20151102.G197.50+00.07.N.b0s0g0.00000
p2030.20151102.G197.50+00.07.N.b5s0g0.00000
p2030.20151102.G197.50+00.07.N.b6s0g0.00000

This seems to be a lot but we didn't do this kind of cleaning in a long time. I recently updated our internal overview page for this, so it is now easier to cancel those "bad" beams and associated workunits.

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