OnDemand is portal offering interactive work with Phoebe supercomputer. It's easy to use from any enviroment - Linux, Mac, or even Windows. Interactive session, once started, runs at the cluster, even if a browser is closed and user disconnected.
most of Phoebe services are available from Institute networks or VPN only
¶ 1.1 Ondemand portal log-in
go to https://ood.phoebe.ceico.cz and login with your Institute “Kerberos” login (your username is typically the word before @ in your email) and your password is same you're using for web-mail access.
¶ 1.2 Python usage concept
Python itself is provided through Lmod modules. User-required packages are installed within isolated Python virtual environments, which must also include JupyterLab.
¶ 1.3 Quick start
- Go to https://ood.ceico.cz
- select "VENV-based JupyterLab"
- Slurm partition: select cpu, or choose gpu if you require GPU acceleration
- Preloaded moduleset: keep empty.
- Python version: Select the version you need, typically the latest one.
- Session duration: - select what you want.
- Instance size - amount of cpu cores
- GPU count left 0 if you don't need any GPU
- Venv name to be created in ~/.venvs/ - select name of virtual environment. Most likely you want to
- Existing venv path to use : keept empty, work in progress
→ Click on Launch button - this will submit the Jupyter session job to scheduler.
¶ 1.4 Wait for job launch
Especially for the first time, start of job, and related creating of initial conda environment can take some time. The session will be first in state Queued:
¶ 1.5 Connect to the launched session
Once the session is in Running state, click on Connect to Jupyter button. In the new tab of browser, Jupyter session will appear.
¶ 2 How-to: Reconnect to already running session
As described above, login to the OnDemand portal at https://ood.phoebe.ceico.cz with your Kerberos username/password. Then, depending on your display resolution, in the top-menu, you should see either "My Interactive Sessions" menu item, or only corresponsing icon. Click on it..
..click on "Launch Phoebe CPU Desktop" and your session will be reopened in new tab of browser.
¶ 3 How-to: End running session
Every running session is consuming part of cluster resources. So after finishing your work, in "My Interactive Sessions" click on red "Delete" button.