Calc

Revision as of 07:09, 2 October 2014

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:

1 Direct Access

via ssh from your client machine within VLAN-168.

Prerequisites:

1. ssh client
2. X server

an X server is needed if graphics shall be displayed, staying in text mode you would not need it.

1.1 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 get 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 Virtual Desktop

you can use a virtual desktop to login there first, then access the calc server.

Prerequisites:

• vnc-client

yum install tigervnc or apt-get install tigervnc-viewer
or similar viewers for windows, etc.

or

• web-browser

2.1 work-flow

connecting through a virtual deskstop another username/password pair is necessary. Your username is mapped to the <Display> number, your password is just the same. start your vnc-client on your laptop

vncviewer 131.130.97.100:<Display>

or - even better tunnel the session through ssh

vncviewer -via <remote-user>@calc.isor.univie.ac.at localhost:<Display>

or use a 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 if you like. On any machine in VLAN-168 you can open a viewer and continue.