Information about the use of the DTPA servers

Note: for general information about our Linux systems see http://fwn06.housing.rug.nl/LinuxInfo.html.

There are 3 eight-core Xeon servers with 32GB main memory available for computations within DTPA that are computational intensive or require more memory than usually. You could use Matlab there for example.
Also these machines are always turned on and running from an uninteruptable power supply (UPS), so long running jobs can be executed there.

The systems and access to it

The hostnames of the system are
fwn03.housing.rug.nl
fwn04.housing.rug.nl
fwn06.housing.rug.nl

They are installed with the LWP, the university standard Linux WorkPlace.
They can be accessed via the 'ssh' or 'vnc' protocols, but only from within the rug.nl domain.
To get access you need to mail us as labDTPA@rug.nl with your p- or s-number, so that access can be granted.
Access will only work if you already logged in to a regular LWP-machine once before, otherwise authentication will fail.

Access can be as follows:

  1. Commands via a terminal window.
    SSH secure shell (UWP: from the RUG menu)
  2. Graphical file browser with copying between machines.
    Secure SSH File Transfer (UWP: from the RUG menu)
  3. Graphical User Interface (X-windows).
    X2GO or TightVNC (not default installed on the UWP). Download it from the Internet from http://www.x2go.org/doku.php/download:start or http://www.tightvnc.com
  4. Simulink on your local machine using external mode.
All but the last item are described at the general page mentioned above.

Matlab/Simulink

You can use Matlab via ssh using the commandline using matlab -nodisplay.
If you want or need the graphical environment, use X2GO.

Next to this you can use Simulink on your local machine in such a way that your model is executed on another machine while the results are displayed locally. Any machine that has Matlab installed on the Internet can be used, for example a DTPA server.
You have to use a specific port number for the connection, the default is ok, but if you have to change it, keep the portnumbers between 17700 and 17750.

See Matlab documentation for more, but note that in most cases there will be no speedup when using Simulink models. If you want speedup, first try 'Rapid Accelleration' in Simulink, or use the 'parfor' construct in Matlab.

Because of a bug on the server it is better to not use a place in your home-directory as your working directory. Use the local disk instead.
This can be done by putting the command "cd /local/your_username" in your startup.m file.


Last modified: Fri Apr 15 16:25:28 CEST 2016