Frequently Asked Questions¶
My Jupyter Notebook Server is killed while my computation was still running. Why?¶
There are multiple possible reasons:
Jupyter Notebook Servers running on https://jupyterhub.ilabt.imec.be are killed automatically after 1 hour of inactivity. “Activity” is defined as doing something in your browser: editing a notebook, using a terminal, etc. Running computations are however not considered as an activity.
This is intentional: JupyterHub is meant for developping, debugging and analyzing results; but not for doing long running computations. Please create a GPULab Job for running those computations.
By using GPULab Jobs it is possible to run multiple long running computations in parallel, which make things like parameter sweeps trivial. It also allows GPULab to detect when your computations have finished, so that we can assign the hardware to the next job in the queue.
The underlying GPULab job might have run out of memory. You will receive an email when this occurs. Knowing how much memory you need can be tricky, and is typically trial and error. When you’re unsure, you can typically reserve up to 10 or 20 GB without much problem: most slaves have at least this much per GPU. But if you know you don’t need it, please reserve less memory.
If you add more than 10GB of data to the docker image, GPULab will kill your notebook and send you an email to inform you about it. If you need a lot of data, use
/project_ghent
,/project_antwerp
or/project_scratch
. Note that if you really need to install this much software, you can do that by pre-installing it in a docker image. There is no limit on docker image size, the 10GB limit only affects on how much the image of a container is allowed to “grow”.
How do I run Tensorboard or other web-based UI’s within JupyterHub?¶
Services like Tensorboard expose their user interface as a website (E.g. Tensorboard launches a webserver on http://localhost:6006).
You can use such tools by accessing them via Jupyter Server Proxy (recommended), or by explicitely exposing a port when launching your Jupyter notebook instance.