[X2Go-User] Suspending sessions causes performance slowing down

[Johannes Töger]

I can answer about the GUI toolkit. I was debugging MATLAB performance issues last week so I looked into this.

Matlab uses the jobamp/jogl framework. https://jogamp.org/jogl/www/

In my Ubuntu/x2go/MATE setup, it falls back on a "software OpenGL" mode, which actually looks like MESA/Gallium software rendering:

In Matlab:
>> opengl info
                          Version: '2.1 Mesa 17.1.3'
                           Vendor: 'Brian Paul'
                         Renderer: 'Mesa X11'
                   MaxTextureSize: 16384
                           Visual: 'Visual 0x61, (RGBA 32 bits (8 8 8 8), Z depth 16 bits, Hardware acceleration, Double buffer, Antialias 0 samples)'
                         Software: 'true'
             HardwareSupportLevel: 'none (known graphics driver issues)'
        SupportsGraphicsSmoothing: 0
    SupportsDepthPeelTransparency: 1
       SupportsAlignVertexCenters: 0
                       Extensions: {152×1 cell}
               MaxFrameBufferSize: 16384



johannes at compute-2:/usr/local/MATLAB/R2019a/sys/opengl/lib/glnxa64$ ls -1
C11ThreadEmulationLibraryLicense.rights
EXTHeaderLicense.rights
GalliumCodeLicense.rights
GLXClientCodeLicense.rights
libGL.so.1
libGL.so.1.6.0
libGLU.rights
libGLU.so.1
libGLU.so.1.3.1
MesaDeviceDriversLicense.rights
MesaLicense.rights


— 
Johannes Töger

Associate Senior Lecturer
Cardiac MR Group
Department of Clinical Sciences Lund, Clinical Physiology
Lund University, Sweden

-----Original Message-----
From: x2go-user <x2go-user-bounces at lists.x2go.org> On Behalf Of Ulrich Sibiller
Sent: Tuesday, June 2, 2020 09:15
To: h i <qpile117 at outlook.com>
Cc: x2go-user at lists.x2go.org
Subject: Re: [X2Go-User] Suspending sessions causes performance slowing down

On Tue, Jun 2, 2020 at 3:04 AM h i <qpile117 at outlook.com> wrote:
> I ran a few tests and see the issue is GUI related in our case. It seems to speak to the 2nd reason for sleep you described regarding the sending of pixmaps.
>
> I ran two MATLAB scripts. Both including the same steps. However, 1 
> script suppressed pop-windows tracking the script status. The 2nd 
> script did not suppress the pop-up windows displaying

What gui toolkit is matlab using?

> real-time status. The 1st script involving command lines ran in the same amount whether the session was active or suspended. No reduction of time or CPU usage. The 2nd script took much longer and CPU was reduced significantly while the session was suspended.
>
> A few questions:
>
> for X2GO_NXOPTIONS="sleep=0", what does 0 represent in time. If I set the value to 1000, what would that mean?

This defines how long nxagent should sleep. The unit should be microseconds but there's a ticket for doublechecking that because it looks like a mixup happened during implementation (https://github.com/ArcticaProject/nx-libs/issues/928).

> Is the idle-nice-level=19 for suspended sessions the default setting?

As I said I don't know the superreniver feature in detail.

> Would the supernicer setting override the x2goagent sleep option setting?

no, they are two different things.

> What would be an example command for the -irlimit option in x2goagent.options file.

see https://github.com/ArcticaProject/nx-libs/issues/796

Uli
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