Re: 2.6.0-test6 scheduling(?) oddness

Nick Piggin
2003-10-01T04:09:52Z

Nick Piggin wrote:

>
>
> Murray J. Root wrote:
>
>> P4 2G
>> 1G PC2700 RAM
>> ASUS P4S533
>> Large tasks (like raytrace rendering) take double the amount of time
>> they used
>> to take, although the system is nicer to the user while they run. In
>> 2.6.0-test5 had a little trouble with it and Piggin pointed me to a
>> patch that
>> fixed it and is now in -test6, however the patch didn't slow the
>> rendering as
>> much as it does in test6. (Con Koliva's patch, I believe it was).
>> For example - rendering an image that took 15 minutes in 2.5.65 takes
>> 20 minutes in 2.6.0-test5 (with patch) and 30 minutes in 2.6.0-test6
>> (raw from
>> kernel.org). Same config options (everything I use builtin - no
>> modules).
>>
>> A new issue (which also doesn't happen in -test5 with the patch):
>> When running cpu intense tasks, new (large) tasks will not start till
>> the first
>> one finishes.
>> For example, using POV-Ray 3.5 to render an image that takes 30
>> minutes when it
>> is the only program running, start oowriter.
>> The render finishes in the same 30 minutes, then oowriter starts.
>> oowriter takes about 3 seconds to load if no rendering is going on.
>> I can use apps that are already open but can't start new ones while
>> rendering.
>> In 2.6.0-test5 (with patch) opening oowriter while rendering takes
>> about 1 minute.
>> In 2.5.65 opening oowriter while rendering takes about 2 minutes (and
>> X gets
>> very hard to use till oowriter is completely done opening).
>>
>
> Hi Murray!
> Con Kolivas' patch has been included in test6. You might have tried that
> or maybe my patch?
>
> Anyway, lets just clarify your report:
> 1 CPU, hyperthreading on or off?
>
> test5 interactivity under load isn't as good as test6.
>
> povray takes 150% more time in test6 vs tset5. How many compute threads
> does povray use? Is anything else running?

Sorry, 150% _the_ time, 50% more time.

>
>
> oowriter takes 3 seconds to load when nothing is running
> oowriter takes 30(or more) minutes to load when povray is runnnig, takes
> 1 minute in test5 plus patch (could you tell us exactly what the patch
> is)
>
>