[winswitch] xpra: high %cpu when start a background application

[Long Nguyen Thanh]

Hi,




On Sat, Sep 6, 2014 at 11:40 AM, Antoine Martin <antoine at nagafix.co.uk>
wrote:

> On 06/09/14 10:07, Long Nguyen Thanh wrote:
> > Hi all,
> > (sorry if my English is not good)
> > I'm using server Ubuntu 12.04 with xpra 0.14-1, client Windows 7 Pro with
> > xpra 0.14
> (those version numbers are incomplete, and if you really are using
> 0.14.0 then you should upgrade it)
>
I'd just upgrade to  xpra 0.14.4-1 at both server and client.

> > Reproduce:
> > A.
> > 1.At server: xpra start :100 --start-child=myapp --bind-tcp=
> 0.0.0.0:20000
> > myapp is an application without GUI.
> > 2. At client : xpra attach tcp:IP:20000
> > 3. At server : top -> %CPU xpra ~ 10%
> Does removing your app make any difference? (just connecting xpra)
> My guess is that sound forwarding is using your CPU for compression (mp3
> or other).
> Yes, even when no sound is being played:
> http://xpra.org/trac/wiki/Sound#StatusandConfiguration
>
 I remove my app, just use : xpra start :100 --bind-tcp=0.0.0.0:20000,
attach and check %CPU. It still ~ 8 - 10%.
My sound forwarding is :  "MPEG 1 Audio, Layer 3 (MP3)" and %CPU of
pulseaudio ~3%

> > B.
> > 1.At server: xpra start :100 --start-child=firefox--bind-tcp=
> 0.0.0.0:20000
> > 2. At client : xpra attach tcp:IP:2000
> > 3. At firefox windows: Open some website ( youtube,...) and check :
> > %CPU ~ 25% - *75%*
> Firefox will repaint the screen regularly, so yes, a high CPU usage with
> such an application is to be expected.
> (animated gifs, flash adverts, widgets, etc)
> > So is it normal with those %CPU when use xpra?
> As per above, turn off sound if you don't use it.
> Any screen updates will also consume bandwidth and CPU, minimizing the
> application when you're not using it will prevent that.
> I have added those questions to the FAQ:
> http://xpra.org/trac/wiki/FAQ#Issues-knownproblems
>
> Cheers
> Antoine
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