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World Community Grid Forums
Category: Support
Forum: BOINC Agent Support
Thread: Work buffer calculation |
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Thread Status: Active Total posts in this thread: 6
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SimCom
Cruncher Joined: Oct 9, 2011 Post Count: 11 Status: Offline Project Badges: 
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Hi there,
how is the (minimum) work buffer set in the BOINC client actually calculated? Dividing the sum of all estimated times with the number of threads used did not get the number of days I set in the work buffer setting, so I was wondering how the calculation acutally works. Best regards, Simon |
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Sgt.Joe
Ace Cruncher USA Joined: Jul 4, 2006 Post Count: 7806 Status: Offline Project Badges: 
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Try this link:http://boincfaq.mundayweb.com/index.php?view=592&language=1.
----------------------------------------Go to the bottom under the heading "In finer detail" Cheers
Sgt. Joe
*Minnesota Crunchers* |
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SimCom
Cruncher Joined: Oct 9, 2011 Post Count: 11 Status: Offline Project Badges:
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Thanks for the link, it provides some useful information. However, it does not answer the question how BOINC determines how many tasks are considered "one day's worth of work".
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ca05065
Senior Cruncher Joined: Dec 4, 2007 Post Count: 328 Status: Offline Project Badges: 
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BOINC maintains a client_state.xml file which contains:
How many threads <p_ncpus>8</p_ncpus> How fast is the computer - floating point and integer <p_fpops>3823244919.528719</p_fpops> <p_iops>10386422564.723055</p_iops> How much is computer on per day <on_frac>0.689718</on_frac> <active_frac>0.999768</active_frac> BOINC also maintains global preferences: How many threads to use as a percentage <max_ncpus_pct>100.000000</max_ncpus_pct> How much CPU time to use as a percentage <cpu_usage_limit>100.000000</cpu_usage_limit> The BOINC client uses the above to calculate how much work can be done per computer day. It knows how much work it has and how much it should have from the buffer parameters and then asks for more if required. |
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SimCom
Cruncher Joined: Oct 9, 2011 Post Count: 11 Status: Offline Project Badges:
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Thanks, that's very interesting.
I can now say that I'd definitely prefer a concrete number of CPU hours, as on_frac will be very misleading in my case. I pretty much fluctuate between not at all and 24 hours per day, depending on where I am for the week. |
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ca05065
Senior Cruncher Joined: Dec 4, 2007 Post Count: 328 Status: Offline Project Badges:
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The on_frac is an average but I do not know over how many days it is measured.
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