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conf_display.md

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configure headless gpu acceleration

nvidia-xconfig --query-gpu-info

GPU #0: Name : Tesla M60 ... PCI BusID : PCI:136:0:0

  • create an xorg.conf file for headless operation
sudo nvidia-xconfig -a --allow-empty-initial-configuration --use-display-device=None \
--virtual=1920x1200 --busid {busid}
  • edit /etc/X11/xorg.conf and delete the sections ServerLayout and Screen
sudo nano /etc/X11/xorg.conf
  • install lightdm as a display manager (this will start the Xserver)
sudo apt install lightdm
  • install a windows manager (to start a session)
sudo apt install xfce4
  • open /etc/lightdm/lightdm.conf and make xfce the user-session by adding the following lines:
[SeatDefaults]
greeter-session=unity-greeter
user-session=xfce
  • start the lightdm service
sudo dpkg-reconfigure lightdm
sudo service lightdm restart

At this point querying nvidia-smi should show an Xorg process using a GPU. This is an X server on display :0 if the server is headless

+-----------------------------------------------------------------------------+
| Processes:                                                       GPU Memory |
|  GPU       PID   Type   Process name                             Usage      |
|=============================================================================|
|    0     13299      G   /usr/lib/xorg/Xorg                           141MiB |
+-----------------------------------------------------------------------------+
  • recommended to resize the display to adjust to a smaller screen
xrandr -display :0 -s 1440x900
  • install a vncserver to connect to the server
sudo  apt install x11vnc
  • start the vnc server:
export SOME_PASSWD="<change this>"
sudo x11vnc -display :0 -passwd $SOME_PASSWD -ncache 10 -auth /var/run/lightdm/root/:0

it will connect to the running X server in display :0 will cache pixels to increase performance and it set's up the authentication cookie.

  • on the local machine, forward x11vnc port (default 5900) from the server via ssh:
ssh -L 5900:127.0.0.1:5900 -C -N -l <USERNAME>  <SERVER_IP>
  • on the local machine start a any vnc viewer, in mac vnc viewer works

open vnc viewer and connect to localhost:5900 then type the specified password and you will see an unbuntu session.

  • test the ai2thor installation by running an example, specify the directory of the unity build
MCS_UNITY="/home/aldopareja/MCS/MCS-AI2-THOR-Unity-App-v0.0.1.x86_64"
python -m machine_common_sense.run_mcs_environment $MCS_UNITY scenes/playroom.json