On 07/01/2020 12:08, Patrick Fleckenstein via shifter-users wrote:
Hi,
I'm running XPRA on Ubuntu headless server. 100GB RAM, 16CPUs, 10Gb network
interface.
If connecting with a small amount of remote machines performance is great.
But in my environment nearly 200 users have to log in at the same time with
their own account.
Therefor I created a script checking on local startup if a xpra process is
running for this user.
If not it starts.
If many users are connected (~90+) performance gets worse with linux load at
200+.
90 is a quite a lot for just 16CPUs.
Is there a performance hack for such a setup or a best practise?
Here are some ideas:
1) turn off any option you don't need, ie: in particular turn off audio
if you don't need it and don't bother starting pulseaudio at all
2) sacrifice some bandwidth for CPU usage by increasing the default
value for "min-speed" (assuming that you have bandwidth to spare)
3) sacrifice some quality: reduce "min-quality"
4) use picture encodings that are light on CPU usage: rgb+lz4 or jpeg on
low quality (this will cost extra bandwidth) - avoid png at all cost
5) tune further to reduce CPU usage - this may require using environment
variables which are only documented in the source code
6) tune your hypervisor, reduce context switching
etc..
Each user instance have to run separatly in each users shell because auth with
ssh which access to the executed program.
Any hints on this or is it simply not possible to run xpra with so much users
on one machine?
It really depends on what your application does, how much CPU and
graphics bandwidth it requires.
90 users is quite high.
Cheers,
Antoine
Regards
Patrick
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