[X2Go-User] Graphical apps stalling in suspended session

[Robert Dinse]

      I'm wondering if this is a bug or intentional?  It makes sense to me
to give more CPU time to interactive applications and lower CPU to those
where there isn't someone on a terminal waiting for a response.

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On Fri, 14 Aug 2015, Matthew L. Dailey wrote:

> Date: Fri, 14 Aug 2015 16:21:49 -0400
> From: Matthew L. Dailey <matthew.l.dailey at dartmouth.edu>
> To: "x2go-user at lists.x2go.org" <x2go-user at lists.x2go.org>
> Subject: [X2Go-User] Graphical apps stalling in suspended session
> 
> We ran into an odd issue recently that feels like a bug, but I wanted to throw it out to the community to see if anyone else has seen this or has any ideas.
>
> When we run a graphical app in xfce via X2Go and then suspend the session, the app continues to run, but significantly slower than if we remain connected. If we resume the session while the app is still running, it resumes its normal speed. This issue seems identical to bug 673 (<http://bugs.x2go.org/cgi-bin/bugreport.cgi?bug=673>), but this was closed because it was not reproducible.
>
> The simplest way I found to reproduce this is to have gnuplot plot in a loop, so it takes a while. If I use this input file:
>
> do for [a=1:200] {
>  plot sin(x+a)
> }
>
> It runs in a reasonable amount of time while logged into an xfce x2go session:
> $ time gnuplot plot.txt
>
> real	0m6.059s
> user	0m1.348s
> sys	0m0.124s
>
> If I use a sleep first and suspend so gnuplot runs in the suspended session, it takes much longer:
> $ sleep 5; time gnuplot plot.txt
>
> real	2m24.365s
> user	0m1.516s
> sys	0m0.176s
>
> Another way to reproduce is to run glxgears and then suspend and resume. Youÿÿll see that while suspended, the frame rate is significantly lower, but then resumes normal speed when the session is resumed.
>
> Here are the particulars of the server:
> OS: Xubuntu 14.04.3 (built this to test - weÿÿre primarily seeing this on our Ubuntu 14.04.3 systems with xfce)
> x2goagent: 2:3.5.0.32-0~668~ubuntu14.04.1
> x2goserver: 4.0.1.19-0~1064~ubuntu14.04.1
> x2goserver-extensions: 4.0.1.19-0~1064~ubuntu14.04.1
> x2goserver-xsession: 4.0.1.19-0~1064~ubuntu14.04.1
>
> Thanks for any help you can provide. Let me know if you have questions or need any other information.
>
> -- 
> Matthew L. Dailey
> Senior Systems Engineer
> Thayer School of Engineering
> Dartmouth College
>
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