[ubuntu-studio-devel] New for saucy

lukefromdc at hushmail.com lukefromdc at hushmail.com
Wed Aug 28 16:46:27 UTC 2013

I've done direct tests comparing compositing to noncompositing desktops of otherwises
similar "weight" on machines barely able to play 720P video. Both my netbook, which
uses the Intel video driver, and a Pentium 4 2GHZ with Radeon 1650 (r500 driver) will
play a 720p/30fps/H264 video without falling behind on a noncompositing environment.

On the Pentium 4 I compared Compiz in Mate to Marco (metacity fork) in Mate, and 
enabling compositing caused the CPU use to hit 100% and the video to fall behind the
audio. Disable compositing, the CPU usage may barely touch 100%, usually between
85 to 95%, with the video keeping up.

On the netbook 720P video playback in Icewm is flawless, in any compositing
environment it is not. In the latter case memory bandwidth is a suspect, as graphics
is on the chipset but the memory controller is on the CPU with one channel of RAM,
a configuration I've never had good results with compositing on. All these cases are
with direct ALSA sound.

On multicore CPUs with discrete graphics this problem goes completely away, thus
I use different DE's in different machines. 

On 08/28/2013 at 9:48 AM, "Ralf Mardorf" <ralf.mardorf at alice-dsl.net> wrote:
>On Wed, 2013-08-28 at 13:44 +0100, lukefromdc at hushmail.com wrote:
>> I would NOT reconmend any compositing DE for a dual core or
>> single-core machine used for any form of performance-critical 
>> like multitrack audio or video editing.
>This is one issue, while your assumption anyway is wrong, the other
>issue is, that young GNOME forks like all relatively new and small,
>unpaid projects need much longer observation than it was possible 
>to do
>for Cinnamon, before it should be available as an alternate DE by 
>installer. I'm not only thinking about "in the last years I 
>e.g. Cinnamon as good or bad", but who are the folks from upstream,
>what's their policy, e.g. will the project be continued in two 
>etc. pp., e.g. how does it interact with other installed software,
>"Gnome-Control-Center has been forked. It is now called
>Cinnamon-Control-Center and it combines Gnome-Control-Center and
>Cinnamon-Settings" - Wiki.
>Even the compositing issue has _nothing_ to do with the CPU, it's a
>graphics driver and/or kernel issue. Even when using Xfce4, but 
>with a
>less good graphics driver, a transparent window doesn't cause a 
>issue when using a vanilla kernel, just if you use a rt patched 
>kernel, the performance for GUIs when using transparency, becomes 
>issue. You don't need a fast CPU, you even don't need a fast 
>but you need a graphics driver that is good. Graphics drivers for 
>are a serious issue per se.
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