Posts tagged levante

Using tmux for persistent ssh connections

Tmux allows you to keep a shell session active when closing your ssh connection. So, when you close your laptop to change a room, you don’t lose the current state of your command line tools. It has many more useful features. However, you need to remember the login node you used to start tmux, and X11 applications (e.g. ncview) will not survive the disconnect. emacs will survive in command line mode (module load emacs ; emacs -nw).

The following examples will assume that you have prescribed your user name and allowed (trusted) X11 forwarding for machines in your ~/.ssh/config

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Basemap on levante

Basemap has reached end-of-life and we won’t install basemap system wide (python 3 module) but you can easily install it into a personal conda environment like this

On Levante:

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How to build ICON on Levante

The current ICON release 2.6.4 has no setup for building and running on the new HPC system levante

There are multiple options to get an ICON binary and run it:

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Using Spyder on levante

The Python IDE Spyder is hidden in the python3 module and needs additional libraries from spack to start.

Load the missing libraries via spack and load python3 (which contains spyder):

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2022-10-17: This problem should be fixed with our current software stack. The workaround is not required any longer.

When trying to start a gui application like gvim, you get an error message:

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Data Migration Mistral to Levante

So that not every user or every project has to copy its data from Mistral to Levante, DKRZ will take over this in a coordinated manner. In this way, the bandwidth between the systems can be better utilised.

We will only copy data located in /work - and only for projects that have resources granted on the Levante system.

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Bus error in jobs

Update: The problem was solved by an update of the Lustre-client by our storage vendor. The workaround described below should no longer be necessary. If you one of your jobs runs into a bus error, please let us know.

When running jobs on Levante, these sometimes fail with a Bus error, similar to the example below:

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