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zombie67 [MM]
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HFCC: How are credits calculated?

I see that HFCC has a quorum of 1. How are credits calculated? It's not the claimed amount. I use a stock client (6.6.12), for my intel/OSX 8-way machine. It is consistently being under awarded, and SIGNIFICANTLY so. Here is every valid result returned so far. Can something please be done to adjust the method (whatever it is) for future tasks?

Claimed / Awarded / % of Claimed

136.0 / 110.8 / 81%
79.0 / 56.3 / 71%
126.4 / 71.2 / 56%
116.2 / 88.7 / 76%
73.6 / 48.5 / 66%
61.8 / 54.4 / 88%
76.0 / 66.7 / 88%
81.4 / 71.4 / 88%
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Former Member
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Re: HFCC: How are credits calculated?

just like everything else ... randomly! biggrin

(unless you are one of the teachers pets!) clown
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[Edit 1 times, last edit by Former Member at Mar 14, 2009 1:56:59 PM]
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Sekerob
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Re: HFCC: How are credits calculated?

Bet you it's 64 bit OS, doing 64 bit benchmarks on 32 bit double precision floating point calculations.

The Zero Redudancy technique of computing the credit is discussed in an Start Forum FAQ:
http://www.worldcommunitygrid.org/forums/wcg/viewthread?thread=6105#178929
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zombie67 [MM]
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Re: HFCC: How are credits calculated?

Bet you it's 64 bit OS, doing 64 bit benchmarks on 32 bit double precision floating point calculations.


Yes, it is a 64 bit machine. But that should not matter (see below).

The Zero Redudancy technique of computing the credit is discussed in an Start Forum FAQ:
http://www.worldcommunitygrid.org/forums/wcg/viewthread?thread=6105#178929


That post talks only about the various scenarios, where redundant tasks are sent out. It does not talk about how credits are awarded when there are no redundant tasks. For all but one of the examples I listed above, they were quorum of 1. No second task was sent. So why was the amount awarded different (less) than the amount claimed?
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[Edit 4 times, last edit by zombie67 at Mar 14, 2009 2:53:28 PM]
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petehardy
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Re: HFCC: How are credits calculated?

zombie67

Look at 4) in the last post of this thread

Pete
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Former Member
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Re: HFCC: How are credits calculated?

The reason is that the claimed credits are determined by the boinc manager based on your benchmark score & the time spend. The benchmark is based on int & float calculations. On a 64bit machine the 32bit integer benchmark run quicker, giving you a higher benchmark score than with the same hardware but a 32bit OS. However since HFCC is primarily float, you don't actually process the workunit quicker than the same hardware with 32bit OS, while your claimed credits are higher.

In redundant projects this is handled by comparing your claimed credits to the claimed credits of your wingmen. In zero-redundancy this obviously isn't possible. Therefore these tasks run a tiny benchmark as part of the workunit, and this benchmark score is reported to the validator. As this benchmark is HFCC specific it obviously primarily does float calculations, resulting in a lower score than the benchmark done by the boinc manager, resulting in a lower granted credit than the claimed credit.


In short: The claimed credit is incorrect because you run 32 bit float tasks on a 64bit OS. smile
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[Edit 1 times, last edit by Former Member at Mar 14, 2009 3:28:13 PM]
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zombie67 [MM]
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Re: HFCC: How are credits calculated?

Edit: Ah. The light went on. Bottom line: A mini-benchmark is run as part of the task, and credits are awarded based on that. Got it. Thanks!
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[Edit 1 times, last edit by zombie67 at Mar 14, 2009 3:38:26 PM]
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Former Member
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Re: HFCC: How are credits calculated?

zombie67,

See I told you the points were just randomly assigned! wink
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Re: HFCC: How are credits calculated?

Any sufficiently advanced technology is indistinguishable from magic.
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petehardy
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Re: HFCC: How are credits calculated?

Any sufficiently advanced technology is indistinguishable from magic.


It is Magic
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