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Message boards : Number crunching : Very low credits

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Derek
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Joined: 6 May 16
Posts: 1
Credit: 1,751,723,919
RAC: 0
Message 22596 - Posted: 20 Jun 2016, 14:17:43 UTC

My GPU R9 nano is getting 3300~3500 credits per task...
https://boinc.thesonntags.com/collatz/show_host_detail.php?hostid=604135

Only 3180 credits for this task, why ??
https://boinc.thesonntags.com/collatz/result.php?resultid=76270750
Run time 65.66 -->very fast
CPU time 5.88
Validate state Valid
Credit 3,180.44 -->very low!!
____________
Derek, team BOINC@Taiwan

rcthardcore
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Joined: 15 May 10
Posts: 9
Credit: 42,217,413
RAC: 4,751
Message 22807 - Posted: 8 Aug 2016, 21:39:20 UTC

CreditNew (CreditScrew) is the answer to your question.

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Joined: 11 Jun 09
Posts: 2525
Credit: 740,580,099
RAC: 1
Message 22814 - Posted: 10 Aug 2016, 4:56:23 UTC - in response to Message 22596.

Faster generally means fewer steps. Credit is based on the total steps computed, so the credit is lower for a WU that has fewer steps. What can't be predicted is how diverse the steps will be from one number to the next. While the CPU doesn't care if a number has more or less steps than the previous number, the GPU slows down when the steps differ more than the size of the lookup table from one number to the next.


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