On Tuesday, September 13, 2011 02:02:01 PM Harald Sitter wrote: > On Tue, Sep 13, 2011 at 1:47 PM, Dan Chen <[email protected]> wrote: > > On Sep 12, 2011 11:31 PM, "Clay Weber" <[email protected]> wrote: > >> What sort of things should we be looking for, positive or negative? > > > > Ditto. I normally have several dozen app/windows open, and the > > performance hitches I noticed before seem resolved. It would be nice to > > know which parameters to test, however. > > From Martin's top secret mail: > > During working for an optimization in 4.8 we noticed that we do deep > > non-const vector copies where a const at() operation was expected. This > > means that we have in each frame: 4x+5xy unneeded copy operations > > (x == number of loaded effects) > > (y == number of windows). > > So on a stock kubuntu desktop we have something like 15 effects > activated, additionally say you have a browser, a music player and a > chat window (mind you, plasma is also a window ;)) that means per > frame you get 4*15+5*4=80 copies of effects, if you get 15 frames per > second (which would be mostly enough to perceive the desktop as > responsive) that means 15*80=1200 copies. You probably do not have 15 > but >40 frames per second that means 3200 copies. Now I actually > forgot what I wanted to write about... > Ah right, so, if you turn on *all* kwin effects (or at least those > that load on your system) and open as many windows a possible, kwin > should not feel overly sluggish (movement of windows, resizing etc.). > Also all effects that worked with the old package should still work > with the new one. > > http://blog.fishsoup.net/2011/06/13/benchmarking-compositor- performance/ In that case, it is all working well then :D No sluggishness here. -- Clay Weber http://kubuntuforums.net http://ubuntumaine.org http://emacdogsports.com
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