Raspberry pi 2 GPU memory allocation?

Hey guys still deciding if I want to go the cubietruck or the rasp pi 2 route.

Any idea of how yunohost handles the ram that is set aside for the gpu?
What amount does it set aside?

I know it is changeable.

Has anyone done this?

YunoHost is based on Debian. GPU is not used because it is a server without desktop graphical interface.