Calc
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=Functional Range= | =Functional Range= | ||
Use remote computing @calc for medium large operations. For small Operations use your laptop, for large ones Ivana's cluster. | 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. | + | Coordinate with your colleagues, and use gkrellm to monitor system resources. (don't be afraid of 30% virtualisations-overhead - we may later buy another server to split virtualisation from computing) |
=Access= | =Access= | ||
Revision as of 09:57, 8 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.
Contents |
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. (don't be afraid of 30% virtualisations-overhead - we may later buy another server to split virtualisation from computing)
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
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>
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.
