BRP4 run times
25 Jun 2012 20:23:32 UTC
Topic 196420
(moderation:
Has anyone noticed an increase in run times for BRP4 cuda tasks? Previously I was completing 2 in a bit less than 3 hrs and with in the last week or so they have crept up to mostly over 3 hrs. Some still run less than 3. Another thing I have noticed is that the spread between the short and long ones has widened. A second clue is that my cpu project {SETI} is getting a bigger RAC which implies that the cpu is not being feeding as much. If this is due to a change in the data nothing to do, but if it my machine I would like to address it.
BRP4 run times
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I have seen variations in runtime depending on what other jobs run on the CPU (GW, Fermi, BRP SSE, or stuff from other projects), but the "amount of work" in a BRP4 workunit itself should be pretty stable, the runtime complexity of the algorithm isn't very data-dependent.
Cheers
HB
Thanx, so your guess is it is
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Thanx, so your guess is it is SETI hogging a bit more of the cpu. As an experiment I will free up one of my 2 cores. If I start processing more than 16 BRP4s in a day,then that is probably the answer.
I fiddled with my
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I fiddled with my configuration in an attempt to get the CPU service required (frequently) by an BRP GPU job to be very fast. This included depopulating the number of CPU jobs, raising the priority of the CPU service task, and other measures.
After those adjustments (and before I entered my current regime of throttling to reduce power consumption when my rooms are hot), the Einstein BRP GPU jobs were astonishingly consistent in the elapsed time required on my two GPU hosts--way under 1% variation as I recall. Much less than Einstein CPU GW jobs, and far, far less than on regular SETI CPU jobs, for example.
So, as others have suggested, I think in your case it is much more likely to be changes on your system than changes in the work supplied.
While you can raise the priority of the CPU task servicing one GPU job as an experiment, doing so as default requires other measures. Two relied on by many people are Process Lasso (the free version is sufficient), or Priority, from Fred, the author of TThrottle and BoincTasks, which is also free (though donations are appreciated).