HPC centres



How to ask a login

How to log in

The easiest to connect is to use a proxy jump. You will still have to enter your password for Occigen but not for the gateway. To do so you need to:

  • set up your ssh key to be able to connect to your gateway without password.

    • If you use a non-empty passphrase, you may consider using a ssh-agent to manage your key during your session

  • set up you proxy jump:

Host occigen
  ProxyJump gatewayname
  User username
  HostName occigen.cines.fr
  ForwardX11 yes
  ForwardX11Timeout 24h
  ForwardX11Trusted yes

Now you can connect with only the occigen password to enter:

ssh occigen


Compile XIOS

Compile and run NEMO

ulimit -s unlimited


To use python on Occigen, the easiest is to use conda.

module load /opt/software/alfred/spack-dev/modules/tools/linux-rhel7-x86_64/miniconda3/
  • Installing packages on the home will put a lot of file and possibly reach the inode limit on your home. The work around is to create a .conda directory on your scratchdir and link it to your home. The drawback is that it is not backed up. The work around it to generate your environment file and save it to your home directory or elsewhere.

(base) xxxxxx@machine:~$ ls -la
lrwxrwxrwx.  1 xxxxx yyyyyy    .....  .conda -> /scratch/zzzzz/yyyy/xxxx/.conda
  • You can generate an environment file like this:

conda env export --from-history
  • You can create an env from an env file like this:

conda env create -f environment.yml


For full details on how to have a login, log in and how to use the computer, see the documentation here



Open MP