Calc
The Calc server is used for remote computing. Local user accounts are provided therefore. calc.isor.univie.ac.at can be accessed in 2 ways.
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1 Functional Range
Use remote computing @calc for medium large operations. For small Operations use your laptop, for large ones Ivana's cluster. Coordinate with your colleagues, and use gkrellm to monitor system resources. (30% virtualisation-overhead might be indicated)
2 Access
2.1 Direct Access
via ssh from your client machine within VLAN-168 (with an IP: 131.130.96.Z).
2.1.1 Prerequisites
- ssh client
- X server
an X server is needed if graphics shall be displayed, staying in text mode you would not need it.
2.1.2 work-flow
Your console (terminal) still controls the session, so if e.g. your laptop runs short on batteries, your calculation is interrupted and lost.
- login at the remote host calc.isor.univie.ac.at
ssh -X <remote_user>@calc.isor.univie.ac.at
- make your data available
- either by running a script to connect your lucky-data
mount_lucky <lucky_user>
- or some secure-copy transfers
scp -r <my_local_data> <remote_user>@calc.isor.univie.ac.at
- start your calculations, e.g
matlab
- transfer your outcome and delete your original data (if you don't use it any more)
or disconnect from lucky
umount_lucky
2.2 Virtual Desktop
you can use a virtual desktop to login there first, then access the calc server.
2.2.1 Prerequisites
- vnc-client like tigervnc (former tight-vnc)
yum install tigervnc or apt-get install tigervnc-viewer or similar viewers for windows, etc.
or
- java enabled web-browser to run an unsigned applet (which normally causes troubles)
2.2.2 work-flow
Make sure to be within the university network. If working from home, establish a VPN tunnel to begin with. connecting through a virtual deskstop another username/password pair is necessary. Your username is mapped to the port:=5900+<Display> number, your password is just the same. start your vnc-client on your laptop
vncviewer 131.130.97.100:port
or - even better tunnel the session through ssh
vncviewer -via <remote-user>@calc.isor.univie.ac.at localhost:port
Best to use the Full-Screen-Mode, note the keys how to escape, e.g. <Strg> + <Alt> + <Shift> + <F> Don't forget to close the vncviewer before opening it at another host to get the geometry-settings right. Some viewers like viagre disable sending special keys by default (<Strg>+<Q> in this case). Make sure to enable them, just not to get locked out in FullScreen mode.
If you use a java-enabled web-browser and allow an unsigned applet to run, calculate your Port := 5800+<Display>
http://calc.isor.univie.ac.at:Port
Use your Virtual Linux Desktop's terminal (e.g. gnome-terminal) and continue as described in 1). Start your calculation and close the viewer. On any machine in VLAN-168 you can re-open a viewer and continue.
2.3 Applications
2.3.1 Matlab
Open a terminal via e.g. Application > Favorites > Terminal. At the command-prompt put in matlab. After the licensing server is asked for authorization the GUI starts up. Don't close this terminal, since it's the controlling terminal for Matlab. Alternatively press <Alt>+<F2> and fill in matlab. You can also use matlab in text mode from the command line.
2.3.2 R studio
edit R source files in some text-editor and run it afterwards, or use rstudio.
