On Wed, 2019-05-29 at 19:45 +0200, Theodore Papadopoulo wrote:
Can someone explain why the destop environment (here Cinnamon) can
such an impact on the graphic card performance ?
Because (I suspect) you're not measuring glmark2 --off-screen, which
means the output that glmark generates has to also be presented to the
screen, which - for cinnamon, and gnome-shell, and kwin's gl mode -
means that display _also_ uses GL and so will be contending with glmark
for the GPU.
The offscreen glmark numbers ought to be nearly identical.
Even better is there a way to investigate the GPU usage (a la ps or
to understand such issues ?
GL profiling is something of a dark art with the open source tools. If
you have an intel gpu you could start with intel_gpu_top from the igt-