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Boinc clock seems to run at half speed.

I have noted since I started that although I am given an estimated time to completion, it takes nearly twice the time to complete the task, whether on a single job and no faster if two running (hypertread), in fact a tad bit slower..

For example at 10 pm yester pm, there was 1.36 hours left to completion on one task, and I am now at 00.17 and the are still some 13 min to go.

At the same time, the second job was started, and I am only shown as having done 57 min, despite the elapse of 2.25 hours.

If I run a single task, suspending the second task, the clock is no faster.

Are we perhaps working on Mars hours wink The arithmatic makes no sense.
[May 26, 2007 11:23:41 PM]   Link   Report threatening or abusive post: please login first  Go to top 
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Re: Boinc clock seems to run at half speed.

Hello snoekie,
You are running BOINC. The 5.8 version of BOINC has a conversion factor that tries to figure out how fast your computer is from the history of time taken to complete work units.
How long have you been running BOINC. (days only or weeks?)
What sort of cpu usage does Task Manager show?
Which projects are you running?
What sort of cpu do you have? (I am assuming Windows XP SP2.)

My copy of BOINC is fairly accurate in its time estimates.

Lawrence
[May 27, 2007 12:32:15 AM]   Link   Report threatening or abusive post: please login first  Go to top 
Sekerob
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Re: Boinc clock seems to run at half speed.

Doubt it is the case here, but benchmarks are run using the full power of a CPU on maximum performance. If the 'Minimum Impact' profile was chosen, you really only get about 60% of crunching done (runs 3 seconds, pauses 2). That gets factored into the TTC (Time To Completion). Similar if the 'real' idle time is significantly less, the original TTC will increase as the job progresses. As Lawrence commented, BOINC learns and eventually will show new jobs from the start with a closer time.

Now the big BUT: The jobs fluctuate in the number of iops/flops they contain (they are up front estimates by the techs). Those iops/flops are used by BOINC to estimate the TTC combined with what it learned and factored e.g. into the DCF (Duration Correction Factor) and CPU efficiency factors. If the iops/flops are off, the initial TTC will be off too. AND, no can't do anything about it as particularly non-deterministic calculations do have significant variation for each attempt they perform.
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[May 27, 2007 7:43:32 AM]   Link   Report threatening or abusive post: please login first  Go to top 
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Re: Boinc clock seems to run at half speed.

Thanks for the replies Sekerob & Lawrence.

I suppose that it makes sense, as I am running a lowish end work rate.

I run a voice activated prog, and that is slowed right down with Boinc running, and priority is definately to be given to the vp, as it yields results for which I get paid.

When I have a heavy dictating session, I will exiting boinc because of the drag/delay that it causes, which also impacts on the accuracy.

Thanks again, but it does not, as I requested at the beginning (in the profile), back off when I am dictating.

The comparison made is done using a period when there is no other activity on the puter.
[May 27, 2007 12:53:10 PM]   Link   Report threatening or abusive post: please login first  Go to top 
Sekerob
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Re: Boinc clock seems to run at half speed.

snoekie,

there is a function for BOINC to resume with delay... you could tell it 30 minutes, thus if you pause your vp or dictations, BOINC would not resume immediately.

Processor Usage
Do work while computer is in use? No
Do work only after computer is idle for: 30 minutes

With these settings you would not have to unload and not loose any progress after a checkpoint.

Sekerob
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[May 27, 2007 1:00:53 PM]   Link   Report threatening or abusive post: please login first  Go to top 
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Re: Boinc clock seems to run at half speed.

Sekerob,

there are tim,es when I am busy on the computer but do not require it to back off. It is only for dictating that it must back off. A dilemma.

I was asked to report back about the timing and also loading and shutdown.

Loading, still 2 min plus before all is up and running smoothly.

Shutdown, if I exit boinc and then close down, about 15 sec. If I exit with boinc running, add about 45 seconds.

Clock. Time estimate and actual time bear no relationship to each other, For time spent on a project. For a time estimate of about an hour, following observation, I am now resigned to the fact that it will not be completed for hours and minutes multiplied by a factor of soemtning between 2 and 3 and it matters not whether it is the only crunch or the usual for boinc, 2 at a time.

I crunch generally for an average of 14 hours plus per day, but a 9 hr estimate will not be completed in one day despite 14+ hours of crunching.

That results in undercredits for rankings. The seconds ticking down are most definately longer than Earth seconds. For example it is now 12.26 pm, with 1hr.38min to completion of my next crunch.

I doubt that that crunch will finish much before 3 pm, despite the so-called adjustment. Boinc hasn't adjusted.
[Jun 23, 2007 11:30:51 AM]   Link   Report threatening or abusive post: please login first  Go to top 
Sekerob
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Re: Boinc clock seems to run at half speed.

snoekie,

The time you see in BOINC are the actual cycles that the client was allowed to use, so yes in 1.5 earth-hours, the client could report just 1 hour CPU time (the idle time available from fractions of seconds).

The 'Time To Completion' (TTC) changes all the time depending on the user-load. If the CPU efficiency as it is called allots 95%, than 1 hour wall-clock gets BOINC only 57 minutes.

There's more factors that go into the TTC computation and also the Duration Correction Factor (DCF), but dont want to cause confusion by further elaboration.

cheers

PS, its different from the old UD agent. That one counted wall-clock time, regardless it getting 100% of the CPU time or 60% of the CPU time.
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[Edit 1 times, last edit by Sekerob at Jun 23, 2007 12:14:21 PM]
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Re: Boinc clock seems to run at half speed.

Sekerob, thanks for the response.

Further to my earlier posting and I note the 57 min out of every hour, but I must report that the 1hr 38 min at 12.26 took until just before 4pm to complete its allotted run, approx 3.5 hrs, and that does not gel with yor 57 min per hour Sekerob. If others are getting that, then I 'is being robbed'!!!

I appreciate you are repeating, probably, what you have gleaned, but............!!

I suppose it is a case all are equal, but some are more equal than others, or is this politician equality??!!
[Jun 23, 2007 3:23:27 PM]   Link   Report threatening or abusive post: please login first  Go to top 
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Re: Boinc clock seems to run at half speed.

snoekie, it's an estimate. Don't give too much weight to what it says.

Firstly, jobs may take any length of time to complete. BOINC is estimating based on the average length - it can easily get it wrong, since the actual length simply isn't known in advance. That's non-deterministic computing for you.

Secondly, as Sekerob tried to explain, this is CPU time. If you are doing something else with your computer while BOINC is crunching, then BOINC will only get a fraction of the available CPU time - say 30 minutes in one hour. The other 30 minutes of CPU time go to your other programs.

In summary, don't use the time estimate to determine when BOINC will finish a work unit.

If you want to analyse it further, then use a system monitor to graph how much CPU time goes to which process.
[Jun 23, 2007 3:33:27 PM]   Link   Report threatening or abusive post: please login first  Go to top 
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Re: Boinc clock seems to run at half speed.

Noted Didact, but as today the use has not been processor intensive and at least an hour unused so for 2hrs.03m.30 s hours at 17.01 to 21.30 is, respectfully, a grossly excessive period.

I appreciate the response, but...........!!!

I have also noted that when I haven't been near the puter for 2 hrs + the same progress is made, only application or in tandem with the second crunch. There ain't much diff.
[Jun 23, 2007 9:05:02 PM]   Link   Report threatening or abusive post: please login first  Go to top 
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