[X2Go-User] Matlab graphics performance when running in x2go

[Ulrich Sibiller]

Thanks, I have included that in the wiki:
https://wiki.x2go.org/doku.php/wiki:development:glx-xlib-workaround#matlab_2019b

Uli

On Tue, Jun 2, 2020 at 8:56 PM Johannes Töger <johannes.toger at med.lu.se> wrote:
>
> I finally figured it out! Now I can run Matlab R2019b on Ubuntu 18.04 LTS with decent graphics performance over x2go, even with transparency using the Mesa llvmpipe software OpenGL driver.
>
> Benchmark for a simple scene:
>
> No transparency: ~40 ms per frame
> With transparency: ~58 ms per frmae
>
> So still some performance penalty for transparency, but much better.
>
>
> HOWTO:
>
> First install LLVM: sudo apt install llvm-dev
>
> I downloaded mesa-20.1.0 (latest version right now) and configured it like this (in the unzipped source directory):
>
> mkdir build
> cd build
> meson -D glx=gallium-xlib -D gallium-drivers=swrast -D platforms=x11 -D dri3=false -D dri-drivers="" -D vulkan-drivers="" -D buildtype=release -D optimization=3 -Dprefix=/usr/local/mesa-20.1.0/
>
> Then I built and installed it as follows:
> ninja
> sudo ninja install
>
> Then to make Matlab load the new driver, I needed to modify Matlab's lib search path:
> cp $MATLAB_DIRECTORY/bin/.matlab7rc.sh ~
>
> Edit the file ~/.matlab7rc.sh, find the glnxa* section and add /usr/local/mesa-20.1.0/lib/x86_64-linux-gnu to LDPATH_PREFIX
>
> Add to your .profile: export MESA_GL_VERSION_OVERRIDE=3.0
>
> Seems like anything will work for the version override except for 3.1, but I didn't debug this further.
>
>
> —
> 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: Wednesday, May 27, 2020 14:29
> To: Johannes Töger <johannes.toger at med.lu.se>
> Subject: Re: [X2Go-User] Matlab graphics performance when running in x2go
>
> Thanks!
>
> On Wed, May 27, 2020 at 1:59 PM Johannes Töger <johannes.toger at med.lu.se> wrote:
> >
> > OK I see - we only have CUDA cards in those machines to do computations, so VirtualGL won't work then.
> >
> > Maybe I'll try to compile an optimized software Mesa/Gallium -- I'll let you know what happens if I find something interesting, so it's documented on the mailing list at least.
> >
> >
> > —
> > 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: Wednesday, May 27, 2020 13:20
> > To: Johannes Töger <johannes.toger at med.lu.se>
> > Cc: x2go users <x2go-user at lists.x2go.org>
> > Subject: Re: [X2Go-User] Matlab graphics performance when running in
> > x2go
> >
> > On Wed, May 27, 2020 at 1:07 PM Johannes Töger <johannes.toger at med.lu.se> wrote:
> > >
> > > Thanks for your quick reply.
> > >
> > > It turns out that Matlab by default uses an older Mesa software rendering module (17.3) when there is no hardware OpenGL. I tried to compile my own version with additional optimizations and LLVMPipe etc, but Matlab wouldn't accept it. No more time to debug it today, but maybe later.
> > >
> > > Is there any documentation on using VirtualGL with x2go? I tried to google it, but no luck.
> >
> > Not that I am aware. I have never checked it out practically.
> > Generally you will have to dedicate the graphics hardware to that
> > (only) session which might make it a no-go, depending on your setup.
> >
> > Uli
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