glmark2 and GPU

While my system has M2000 GPU and the CPU is Ryzen which doesn’t have any builting graphic processor, when I run glmark2, I see that CPU utilization goes high (600% out of 1600% means 6 threads out of 16 threads) while there is no process on GPU.
Only xorg is on the GPU with 80 MB of memory and when I close glmark2, xorg process still remains on GPU.

Please see the picture at
Is that normal?