How to run glmark2-drm to benchmark an external GPU on a Raspberry Pi

Recently I wanted to see whether I could get glmark2 (an OpenGL 2.0 and ES 2.0 benchmark tool) to run on a Raspberry Pi with an external graphics card (see this thread).

But glmark2 isn't available in any Pi repositories, so you have to build it from source:

sudo apt install -y meson libjpeg-dev libdrm-dev libgbm-dev libudev-dev
git clone https://github.com/glmark2/glmark2.git
cd glmark2
meson setup build -Dflavors=drm-gl,drm-glesv2
ninja -C build
sudo ninja -C build install

I built this for drm only, so it can run fullscreen without any X/Wayland environment. To run the full suite:

glmark2-drm

Or you can run a specific benchmark like glmark2-drm -b jellyfish.

[email protected]:~ $ glmark2-drm -b buffer
=======================================================
    glmark2 2021.12
=======================================================
    OpenGL Information
    GL_VENDOR:      X.Org
    GL_RENDERER:    AMD CEDAR (DRM 2.50.0 / 5.10.17-v8+, LLVM 11.0.1)
    GL_VERSION:     3.1 Mesa 20.3.5
    Surface Config: buf=32 r=8 g=8 b=8 a=8 depth=24 stencil=0
    Surface Size:   1920x1080 fullscreen
=======================================================
[buffer] <default>: FPS: 29 FrameTime: 34.483 ms
=======================================================
                                  glmark2 Score: 29 
=======================================================

On my Raspberry Pi with an AMD Radeon 5450, it's not the best performing setup in the world—half the tests don't run yet—but it's a helpful tool to see if you still need to improve the drivers a bit :)

Stay tuned to my YouTube channel; I'll be posting an update on external graphics cards on the Raspberry Pi soon!