[X2Go-User] Suspending sessions causes performance slowing down

[Johannes Töger]

Should be "with and without transparency"...


— 
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 Johannes Töger
Sent: Tuesday, June 2, 2020 11:58
To: Ulrich Sibiller <uli42 at gmx.de>
Cc: x2go-user at lists.x2go.org
Subject: Re: [X2Go-User] Suspending sessions causes performance slowing down

I did some quick benchmarks by rotating a simple 3D model with and without benchmarks, see script at the end. Transparency is turned off by setting alpha = 1.

Baseline:
Without transparency: 71±11 ms per frame With transparency: 781±112 ms per frame

Using export _JAVA_OPTIONS=-Dsun.java2d.xrender=true:
Without transparency: 69±12 ms per frame With transparency: 771±110 ms per frame


So within the measurement variance.




function matlab_graphics_perf_test

Nang = 50;
azvec = linspace(-180, 180, Nang) + 45;
el = 27;

figure(9)

[x,y,z] = peaks;
alpha = 0.5;
surf(x,y,z, 'FaceAlpha', alpha)
axis vis3d

Tvec = zeros(size(azvec));

for azloop = 1:length(azvec)
    tic
    view([azvec(azloop) el])
    drawnow
    Tvec(azloop) = toc;
end

fprintf('Average frame time: %g ± %g s\n', mean(Tvec), std(Tvec));


end


—
Johannes Töger

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

-----Original Message-----
From: Ulrich Sibiller <uli42 at gmx.de>
Sent: Tuesday, June 2, 2020 11:04
To: Johannes Töger <johannes.toger at med.lu.se>
Cc: h i <qpile117 at outlook.com>; x2go-user at lists.x2go.org
Subject: Re: [X2Go-User] Suspending sessions causes performance slowing down

Usually you can instruct java to use xrender by calling java with "-Dsun.java2d.xrender=true" or run "export _JAVA_OPTIONS=-Dsun.java2d.xrender=true" prior to starting the java application. You can also configure that globally:
https://serverfault.com/questions/270924/setting-java-runtime-setting-for-all-users-on-a-client-pc

This generally should reduce the number of pixmap related calls. But I don't know if it will have any effect on jogl.

Uli

On Tue, Jun 2, 2020 at 10:47 AM Johannes Töger <johannes.toger at med.lu.se> wrote:
>
> 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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