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\"Result duration correction factor\"

Questions and Answers : Windows : \"Result duration correction factor\"
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John Price
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Message 16747 - Posted: 24 Oct 2005, 21:54:42 UTC

What is the above?
I notice most of my PC\'s are set to 1.0, wheras my Atlon 64 3000+ has a figure 1.424242.
What is this telling me?
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John Price
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Message 16748 - Posted: 24 Oct 2005, 21:59:01 UTC

p.s.

I have just realised that this machine looks a though it has been struggling with a misallocated result and I have reset the project.
Has this something to do with it?
I also notice that my Linux machine is not showing a \"Result duration correction factor.\"
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Les Bayliss
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Message 16749 - Posted: 24 Oct 2005, 22:03:10 UTC

I can\'t see this on mine.
Where abouts is it displayed?

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Message 16750 - Posted: 24 Oct 2005, 22:14:26 UTC - in response to Message 16749.  

I can\'t see this on mine.
Where abouts is it displayed?


My machine number is 170146

It is down the bottom of the page below \"Average CPU efficiency\" and above \"Location\".

Is it to do with using Boinc 5.2.2
Windows XP Home.
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Les Bayliss
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Message 16752 - Posted: 25 Oct 2005, 0:23:37 UTC

It must be 5.2.2
I don\'t have \"Average CPU efficiency\" either.
I\'m still on 4.25

At least the other person won\'t be getting your credits now. :)

There may be something about 5.2.2 on the SETI site, as they have far more people than us.

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Les Bayliss
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Message 16761 - Posted: 25 Oct 2005, 5:02:10 UTC
Last modified: 25 Oct 2005, 5:09:26 UTC

I found it mentioned in the BOINC Wiki <a href=\"http://boinc-doc.net/boinc-wiki/index.php?title=Version_History_of_The_BOINC_Client_Software\"> here,</a> under Major Features of Version 5.x.x. But no explanation.

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Profile Thyme Lawn
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Message 16766 - Posted: 25 Oct 2005, 8:00:56 UTC
Last modified: 25 Oct 2005, 8:02:06 UTC

The duration correction factor (DCF) is used in determining how long a result will take to complete.

BOINC makes an initial estimate based on the system\'s benchmark figures and the estimated number of floating point operations specified for the result (actually in the workunit, but that\'s just nit-picking). This is then weighted by the DCF for that project.

As a result is processed the project\'s DCF is modified to improve the time estimate.

Unfortunately the initial estimate is way out for CPDN (I\'m seeing a 50% over-estimate in spinup testing!) and the adjustment downwards is in very small increments. My guess is that it\'ll take at least one complete result on your host to get the DCF down to the point where BOINC gives a reasonable estimate for CPDN.

I can see this causing problems for people who are running multiple projects, with BOINC being forced into EDF scheduling mode unnecessarily because it thinks a CPDN result isn\'t going to meet a deadline that\'s easily achievable.
"The ultimate test of a moral society is the kind of world that it leaves to its children." - Dietrich Bonhoeffer
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Profile Keck_Komputers
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Message 16768 - Posted: 25 Oct 2005, 8:48:14 UTC - in response to Message 16761.  

I found it mentioned in the BOINC Wiki <a href=\"http://boinc-doc.net/boinc-wiki/index.php?title=Version_History_of_The_BOINC_Client_Software\"> here,</a> under Major Features of Version 5.x.x. But no explanation.


Sorry the link is in now. The page is here: http://boinc-doc.net/boinc-wiki/index.php?title=Result_Duration_Correction_Factor
BOINC WIKI

BOINCing since 2002/12/8
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Message 16770 - Posted: 25 Oct 2005, 9:19:48 UTC

Thanks for the link. Looks like lots of new things to learn.

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Questions and Answers : Windows : \"Result duration correction factor\"

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