Glmark2 is a light and very good tool to make the benchmark of our video card on Linux.
We find glmark2AUR on AUR repository ( ArchLinux User Repository ).
In order to install AUR packages we can use Yaourt ( How to Install Yaourt the Additional Package Manager on Arch Linux ).
Open the terminal and type
yaourt -S glmark2
You may receive the following error message Checking for function sqrt : not found
In this case we can install the glmark2-git version by typing the following command:
yaourt -S glmark2-git