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 <[email protected]>
To: "[email protected]" <[email protected]>
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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