Then follow the directions from start_vnc.sh. To start a VNC session type the following with a return after each line: Portal1 is designated to host VNC sessions. Warning: The VNC password is transmitted in clear text over the network and should not be considered secure Server-Side Setup for PHASTA Machines Start VNC Server 3 Client-Side Setup for PHASTA Machines.2.5 Changing the Size (Resolution) of an Existing Session.2 Server-Side Setup for PHASTA Machines.We only provide remote rendering using VNC, but VGL Image Transport might be added in the future. Yes, see and Is it possible to use VirtualGL's Image Transport method? Is there more documentation on VirtualGL? There's currently no easy way to get statistics on the compression performance. The actual image compression (before network transmission to the VNC client) is performed by the VNC server. Total - the total speed for the above steps, including overhead.Blit - the speed at which the captured images are integrated in the VNC session.Readback - the speed with which the rendered output is read-back from the video card.This will periodically produce statistics in the terminal window on You can use the +pr option when starting your OpenGL application with vglrun, e.g. VirtualGL Is there a way to get statistics on rendering performance? No, the current security setup does not allow users to share VNC passwords, as they are the same as your CUA password. Is it possible to share my VNC session with others so that we can discuss the visualization output while not being in the same place? They need to know your VNC password (and you have picked a strong enough passphrase that can't be guessed, right?)Īll in all, the risks should be minimal.For being able to log into Snellius they need to have their IP address whitelisted and have valid login credentials.Data sent between the remote VNC desktop on Snellius and the client running locally is encrypted using an SSH tunnel.In theory, somebody also logged into Snellius could try to connect to the VNC server you started on a render node. Isn't it possible that somebody other than me snoops on my VNC session? When you find that the Alt-key seems to be "stuck" in your VNC viewer simply press and release Alt. This is probably because the Alt keypress event is captured by the VNC viewer, but the subsequent TAB keypress will take away keyboard focus and so the viewer application never receives a release event for the Alt key, thinking it is still pressed when you switch back to it. Some VNC viewers (and versions) have problems when you're using Alt-TAB to switch to and from the viewer application. After switching between my VNC viewer and some other application on my local machine the VNC viewer seems to get confused about the keys I press E.g., for a VNC server running on gcn10:1 check gcn10.1.log. $ vnc_desktop -reservation= Something strange is going on with my VNC session, is there a VNC server log file I can check? How do I run the VNC job within a SLURM reservation? Yes, use the -r x option with vnc_desktop.Another option is to set the environment variable VNC_DESKTOP_RESOLUTION in your shell's startup script, again to x, so you don't have to use -r each time. The desktop resolution is quite low in the VNC session, can I change it? The VNC server used on Snellius and Lisa is actually TurboVNC. Note that "Screen Sharing" on MacOS is not usable as a VNC viewer, at least, not in our tests. Plus, we have seen issues with the TightVNC client not supporting the required authentication methods we use on the server side. TightVNC and RealVNC might also work, but sometimes seems to have noticeable lower performance (especially on Windows). In principal any viewer supporting the VNC protocol can be used, but the two mentioned are well maintained and provide good performance. Of these two, TigerVNC has a nicer GUI and appears to have slightly better performance. TurboVNC and TigerVNC are good choices and the ones we recommend. VNC There seem to be a lot of VNC viewers out there, which ones do you recommend?
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