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 <ul...@gmx.de> Sent: Wednesday, May 27, 2020 14:29 To: Johannes Töger <johannes.to...@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.to...@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 <ul...@gmx.de> > Sent: Wednesday, May 27, 2020 13:20 > To: Johannes Töger <johannes.to...@med.lu.se> > Cc: x2go users <x2go-user@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.to...@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 _______________________________________________ x2go-user mailing list x2go-user@lists.x2go.org https://lists.x2go.org/listinfo/x2go-user
