Message boards : Number crunching : Atlas credits vs Theory
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Guiri-One[Andalucia]

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Message 44199 - Posted: 26 Jan 2021, 13:27:41 UTC

Hi team,

I just noticed there is a huge differente in credits between Atlas and Theory.

Atlas is, at least, half (or I dont understand something, which could be :) ).

Example:

https://lhcathome.cern.ch/lhcathome/results.php?hostid=10670205

Is there any reason? I am cancelling Atlas manually when it comes so as I just run whaetever but Atlas.[url][/url]
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Harri Liljeroos
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Message 44204 - Posted: 27 Jan 2021, 10:29:33 UTC

Well, Atlas credits have dropped to half during the last week or so. We would like to know why.
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Guiri-One[Andalucia]

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Message 44205 - Posted: 27 Jan 2021, 11:07:02 UTC - in response to Message 44202.  
Last modified: 27 Jan 2021, 11:08:28 UTC

Because I am behind a pool and cant so do. I wish I could.

Hello,

If you don't want to run ATLAS, why don't you just remove it from your preferences?

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Guiri-One[Andalucia]

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Message 44206 - Posted: 27 Jan 2021, 11:07:51 UTC - in response to Message 44204.  

Indeed. I will try to avoid such tasks, but scheduler only sends me atlas, even If I cancell nonstop while not even downloaded.

Well, Atlas credits have dropped to half during the last week or so. We would like to know why.

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computezrmle
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Message 44207 - Posted: 27 Jan 2021, 12:42:39 UTC

The most common answer is that LHC@home uses the standard credit system implemented in the BOINC server.
It's typical for this credit system that the amount of credits vary, caused by many components affecting the calculation.
This affects each subproject and each computer individually.
It's also typical that after a while the amount of credits return to the usual values.




Caution!
The text following this hint may contain irony.
People getting sick when they get in contact with irony should stop reading here.
Ye be warned!



Don't believe in the explanation above, it's a typical conspiracy theory.
The real truth is as follows.

Deep under the ATLAS cavern there's another cavern - a secret one, unknown to the public.
That cavern is the home of a troll who was a member of the earth creation team and he just missed the last bus to the next planet construction site.
Luckily some human scientists built the LHC right above the troll's cavern and since then he can eat magnetic fields from the dipole coils and drink liquid helium.
The troll's only hobby is to occasionally throw some dice and according to the results he changes the volunteer's BOINC credits.
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tullio

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Message 44208 - Posted: 27 Jan 2021, 13:52:03 UTC
Last modified: 27 Jan 2021, 14:22:32 UTC

I am running six BOINC projects. Some use the BOINC credit system and some, like Einstein@home and QuChemPedIA@home give a fixed credit for each kind of tasks. In Eintein, which uses also GPUs, you can get three times the credit on a Gamma Ray Binary Pulsar Search on GPU than on a Gravitatipnal Wave search also on GPU. Both are greater than a credit of a CPU task on the same type of tasks. When SETI@home wa alive there were were inflamed discussions on the BOINC credit system which was nicknamed "Credit Scrooge" after the Uncle Scrooge character in a novel, i believe by Dickens.
Tullio
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David Cameron
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Message 44223 - Posted: 29 Jan 2021, 13:00:14 UTC - in response to Message 44208.  

"Uncle" Scrooge is from the Donald Duck cartoon :) but indeed he was based on the Scrooge character from Dickens' "A Christmas Carol".

As others have mentioned ATLAS and other LHC projects use the mysterious default BOINC credit system. The differences you see over time are probably due to small differences in the running time of the different batches of tasks. If a batch is submitted which has faster running tasks then credit will fall but it will adjust over the long term.

PS don't tell anyone about the troll under the LHC or he will get angry!
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tullio

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Message 44227 - Posted: 29 Jan 2021, 17:18:17 UTC

As I said elsewhere, credits are like money. The more they are they less are worth.
Tullio
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Message boards : Number crunching : Atlas credits vs Theory


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