Calc

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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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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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=Functional Range=
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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.
 
=Access=
 
=Access=
 
==Direct Access==
 
==Direct Access==

Revision as of 09:13, 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.

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

  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.

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

caption

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.

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