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Sudden extra credits?

Sudden extra credits?

Questions and Answers : Windows : Sudden extra credits?
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Profile adrianxw
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Message 24206 - Posted: 6 Sep 2006, 8:02:25 UTC

A large number of my team members received a sudden influx of credit yesterday. People that normally earn 3-400 per day yesterday received thousands! Not everbody was so blessed, others that get credit every day received their normal quota.

CPDN stats page showing the anomoly.
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Profile MikeMarsUK
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Message 24207 - Posted: 6 Sep 2006, 8:06:03 UTC
Last modified: 6 Sep 2006, 8:07:06 UTC

Credit\'s per trickle increased fron 229 to 259.2 (which happens to be the number of timesteps in a model year, 25920 / 100)

I presume to be fair this was then applied retrospectively. I haven\'t heard anything official, but I assume it was a deliberate change rather than a typo! (trickles / 10 = Seasonal Attribution\'s credit scheme).
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Profile adrianxw
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Message 24208 - Posted: 6 Sep 2006, 8:12:20 UTC
Last modified: 6 Sep 2006, 8:12:43 UTC

Surely everyone should receive a boost then not just a random few.

If you look at the stats page I linked, you\'ll see some who regularly contribute get nothing, others that have not contributed at all recently have got some, and variations in between.

I seem to get 160.7 credits per trickle incidently.
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Message 24211 - Posted: 6 Sep 2006, 9:36:42 UTC - in response to Message 24208.  
Last modified: 6 Sep 2006, 9:36:17 UTC

if they\'re running the sulphur cycle they may get less than the current coupled model per trickle; I \"balanced\" the weighting yesterday to reflect that some models are harder to run. I think the credits per trickle should be pretty close, i.e. here\'s the table I use:

+---------+-----------------------------------+-------------------+---------------------+
| modelid | description                       | timestep_per_year | credit_per_timestep |
+---------+-----------------------------------+-------------------+---------------------+
|       1 | UK Met Office HADSM3 (Slab Model) |             17280 |             0.00875 |
|       2 | HadSM3 with sulphur cycle         |             17280 |            0.014875 |
|       3 | HadCM3 Spinup Experiment          |             25920 |                0.01 |
|       4 | HadCM3L Coupled Model Experiment  |             25920 |                0.01 |
+---------+-----------------------------------+-------------------+---------------------+



so credits per timestep should be 259.2 for hadcm3l and 257.04 for sulphur cycle
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Profile adrianxw
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Message 24212 - Posted: 6 Sep 2006, 10:47:13 UTC

So those running sulphur cycle that have not had their \"bonus\" yet will receive it today?
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Profile Pooh Bear 27
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Message 24215 - Posted: 6 Sep 2006, 12:53:19 UTC

Is this retro? Meaning complete units, also? I saw a pretty good increase already, but I have not dug through to see if everything was done.

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Profile geophi
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Message 24218 - Posted: 6 Sep 2006, 13:34:47 UTC - in response to Message 24212.  

So those running sulphur cycle that have not had their \"bonus\" yet will receive it today?

No. Before this change, slab/sulphur\'s credits relative to the coupled model were inflated, or the coupled model\'s credits were deflated, however you want to look at it. When I went from a sulphur to a coupled model on the same PC, the RAC for that PC went quite a ways down, meaning that one wasn\'t getting near the same amount of credits for the same computer time. Now, this should fix the inequity.
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Message 24219 - Posted: 6 Sep 2006, 13:52:11 UTC

I seem to recall my RAC dropping when I went from regular slabs to Sulphur cycle, that was never addressed.

I can already see the rankings at a couple of the big team sites being screwed about. I suspect there will be more said about this.
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