Re: 2.6.0-test6 scheduling(?) oddness

Nick Piggin
2003-10-01T04:09:06Z

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?

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)