I would like to know how one computer can get 17.8 credits/h crunching a WU and 11.1 credits/h for crunching another WU. Feels a bit odd to me.
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Krunchin-Keith [USA]Volunteer moderator
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Posts: 3319
Credit: 5,592,091
RAC: 379
I would like to know how one computer can get 17.8 credits/h crunching a WU and 11.1 credits/h for crunching another WU. Feels a bit odd to me.
Well since you didn't reference work units and your computers are hidden it is hard to tell exact details.
Most likely it is due to averaging or minimum. Look into the work units and see what other computer they were processed against. Probally each work unit was with a different other computer, sometime the other computer claiming less credit and sometimes yours.
/ I would like to know how one computer can get 17.8 credits/h crunching a WU and 11.1 credits/h for crunching another WU. Feels a bit odd to me.
Well since you didn't reference work units and your computers are hidden it is hard to tell exact details.
Most likely it is due to averaging or minimum. Look into the work units and see what other computer they were processed against. Probally each work unit was with a different other computer, sometime the other computer claiming less credit and sometimes yours.
Well, I don't understand why sometimes you get the minimum and sometimes it is averaged. My computer hasn't changed in between! I just expect every computer to receive a fixed amount of credits for every hour it crunches.
Time Claimed Granted
7,118.03 32.58 21.93 = 11.09/h
7,712.14 35.30 33.56 = 15.67/h = + 41.3%
8,126.48 37.20 42.09 = 18.65/h = + 68% !!!!!!!!!!!!!!!
Such difference while it all is one the same computer and in 1 hour.
In he worst case one could get say 40% less credits cause he/she is unfortunate.
The project is the most important butt you don't give credits for nothing.
And there is no use in getting the other host's figures cause they should get the fixed amount of credits for every hour also.
/ sjips - -t
/ 
Well, I don't understand why sometimes you get the minimum and sometimes it is averaged. My computer hasn't changed in between! I just expect every computer to receive a fixed amount of credits for every hour it crunches.
Time Claimed Granted
7,118.03 32.58 21.93 = 11.09/h
7,712.14 35.30 33.56 = 15.67/h = + 41.3%
8,126.48 37.20 42.09 = 18.65/h = + 68% !!!!!!!!!!!!!!!
Such difference while it all is one the same computer and in 1 hour.
In he worst case one could get say 40% less credits cause he/she is unfortunate.
The project is the most important butt you don't give credits for nothing.
And there is no use in getting the other host's figures cause they should get the fixed amount of credits for every hour also.
Credits are granted based on how hard your cpu has to work to crunch. Some units our cpu's kind snooze thru and other units they have to work hard on. The more work the cpu's do the more credits they get. Other Projects do grant a fixed amount of credit per workunit no matter how much work your pc does. There are people over there wanting it this way. I crunch for one Project that gives 12 credits per workunit, no matter how long it takes you get 12 credits per workunit! I personally kinda like this way better.
/ My cpu's are crunching 24/7 and even when I'm surfing or typing a letter or whatever they run on so perhaps you could tell me when is a cpu working hard and when not.
/ Krunchin-Keith [USA]Volunteer moderator
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Joined: Nov 10 05
Posts: 3319
Credit: 5,592,091
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You still need to look at the drill down detail of each completed work unit to see why you got a certain credit. There credit for each completed work unit is granted based on the lowest claim of the two computers completing it.
You get different credit because your computer is not always VALIDATED against the same other computer.
Credit is also based on the BOINC benchmark for each computer. These are recalculated about every 7 days. If other programs are running including any windows background processes run at the time the benchmark runs, you sometimes end up with a lower than your maximum score.
And yes, even when you are doing something else, your computer is krunching, but not at 100%. Some small amount is taken away to run other applications, includung your browser. BOINC manager and Project applications run at a lower priority, meaning most other programs run while you BOINC slows down some. IT may be samll and unnoticable to you. You need to view task manager and watch the percent used for BOINC and all running project applications, you will see it is not always 100%. This accounts for some of the reason why a difference.
Credit is also usually granted based on Flops, caleld Floating point operations. CPU's also do IOps. Some applications or tasks end up using more or one or the other, thus again another difference.
Each work unit does not always run the same length of time, some end early.
This is the way BOINC works, a full explanation is in the BOINC wiki.
Some projects change the rules by granting credit under different rules.
The admins here have told many times in the forum they use the published formula.
/ I would like to know how one computer can get 17.8 credits/h crunching a WU and 11.1 credits/h for crunching another WU. Feels a bit odd to me.
It's because the project uses BOINC's simple validator.
When a WU reaches its quorum of valid tasks (2 for malariacontrol.net) the validator first averages the claimed credits.
If all claims are within 15% of the average every task is granted the average.
Otherwise the claimed credit for each computer is compared with the computer's historical granted credit per CPU second and the credit claimed by the computer closest to its historical average is granted to every task.
(There's a special case when a task is returned late and another task was issued. When a WU reaches its quorum the simple validator is applied as before. Any task returned after this will be granted the same as the others if it's within deadline but gets no credit if it's over deadline.)
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