[X2go-Dev] nice, ionice with x2go?

[John A. Sullivan III]

On Mon, 2011-06-27 at 11:45 -0700, John Williams wrote:
> Has anyone experimented with 'nice' or 'ionice' to improve x2go
> responsiveness? If so, what x2go processes might benefit?
> 
> The linux server that I am running x2goserver on sometimes has high
> loads, both CPU and disk IO. However, there should be plenty of
> resources left, since never are all of the CPU cores maxed out, and
> the root filesystem is running on a fast SSD. Nevertheless, sometimes
> x2go responsivity will go to almost nothing for a few seconds.
> 
> So, I was thinking to try x2go with 'nice -n -10' and 'ionice -c 2 -n
> 0' or even 'ionice -c 1', but I am not sure how to go about that. Does
> there exist anywhere a short description of the jobs that x2go starts
> when it is invoked, and what each does? Currently I see:
> 
> x2gocleansessions (root, PPID 0)
> x2goagent (user, PPID 1)
> x2goruncommand (user, PPID 0)
> ssh (.x2go) (user, PPID 0)
> sshfs (.x2go) (user, PPID 0)
> 
> but I am not sure which are important to responsivity, and which
> scripts started which processes (so I can edit the scripts to insert
> 'nice' commands).
<snip>
I'm going to take a guess that x2gocleansessions, x2goruncommand, and
sshfs are NOT what you are looking for.  x2goagent, ssh, and perhaps X
itself might be candidates but that is just my guess - John