...
/bin/bash is to run the program you wish to start in the interactive session, the bash shell (mandatory, you need to specify a program it doesn't have to be a command line interpreter like bash it could by python or matlab if that's what you want to run)
Running Jupyter Notebook Sessions on Axon
Using sjupyter
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The sjupyter command is meant to quickly run a jupyter notebook using the default anaconda environment with one command. For more complicated usage in batch files and such running the command directly from an interactive session or batch file is a better approach. |
Axon has a command (sjupyter) that will start up a Jupyter notebook server automatically and give you the URL to connect. To use this command, first connect to the login node (e.g. ssh axon.rc.zi.columbia.edu), then navigate to the directory you want to start your notebook in, and finally run sjupyter. For instance, if you wanted to run a Jupyter notebook within a directory named my-great-analysis that existed within your home directory, you might run the following commands:
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jsp2205@Johns-MacBook-Pro [12:01:49]> ssh axon.rc.zi.columbia.edu
(base) [jsp2205@axon ~]$ cd ~/my-great-analysis
(base) [jsp2205@axon my-great-analysis]$ sjupyter
Waiting for the Jupyter Notebook SLURM job to start...
.
Jupyter Notebook is starting...
............................
Jupyter Notebook has started
To access the notebook, open this file in a browser:
file:///home/jsp2205/.local/share/jupyter/runtime/nbserver-86057-open.html
Or copy and paste one of these URLs:
http://10.198.24.59:8614/?token=9c53efc98ab7757cb102b875bfee4c5da858f801ae90b906
To turn off Jupyter notebook, run "scancel 45737".
To reprint the URL for the Jupyter notebook, run "/usr/local/bin/sjupyter --get-notebook-url=45737". |
The notebook will stay running for the duration of the job so you can reconnect to it if needed using the URL. If you forget the URL, you can reprint the URL by using the --get-netbook-url option along with the SLURM job id as follows:
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(base) [jsp2205@axon ~]$ sjupyter --get-notebook-url=45737
To access the notebook, open this file in a browser:
file:///home/jsp2205/.local/share/jupyter/runtime/nbserver-86057-open.html
Or copy and paste one of these URLs:
http://10.198.24.59:8614/?token=9c53efc98ab7757cb102b875bfee4c5da858f801ae90b906 |
To turn off a Jupyter notebook instance, you may use the standard SLURM job cancelling command (scancel). Note that there is a time limit of 5 days for jobs that run on the shared or burst partitions (see Slurm Overview), so any Jupyter notebook servers running on these partitions will be cancelled automatically after the time limit is exceeded.
sjupyter can also be run with any of the standard sbatch flags, so if you want to specify exactly what resources should be available to the Jupyter notebook instance, you may do so by appending sbatch options to the command you run. For instance, the command below requests that 3 GPUs and 16 GB of memory per CPU be available to the Jupyter notebook:
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(base) [jsp2205@axon slurm]$ sjupyter --mem-per-cpu=16G --gres=gpu:3
Waiting for the Jupyter Notebook SLURM job to start...
.
Jupyter Notebook is starting...
..............................
Jupyter Notebook has started
To access the notebook, open this file in a browser:
file:///home/jsp2205/.local/share/jupyter/runtime/nbserver-187906-open.html
Or copy and paste one of these URLs:
http://10.198.24.59:8074/?token=298fbd14329110b21ecb0d2765858fa836cd6694edabb502
To turn off Jupyter notebook, run "scancel 45747".
To reprint the URL for the Jupyter notebook, run "/usr/local/bin/sjupyter --get-notebook-url=45747". |
Manually starting a Jupyter notebook
Launching a jupyter notebook from a slurm session requires two things, a python environment which has jupyter installed (the default anaconda environment from modules meets this requirement) and a special shell variable initialized (XDG_RUNTIME_DIR="").
The command to start a jupyter notebook is as follows jupyter notebook --no-browser --port=${PORT} --ip=${IP}, where ${PORT} is the port that jupyter will listen on (can't be in use on that server so should random or check to see if port is in use) and ${IP} is the external IP address of the server (otherwise it will default to the localhost port which is only accessible from that machine, which doesn't have a web browser).
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[aa3301@axon ~]$ srun --pty -c 8 --gres=gpu:2 -t 0-01:00 /bin/bash
[aa3301@ax08 ~]$ ml anaconda3-2019.03
[aa3301@ax08 ~]$ XDG_RUNTIME_DIR=""
[aa3301@ax08 ~]$ jupyter notebook --no-browser --ip=$(hostname -I | awk '{print $1}') --port=$(shuf -i 8888-9000 -n1)
[I 11:43:24.018 NotebookApp] [nb_conda_kernels] enabled, 1 kernels found
[I 11:43:25.289 NotebookApp] JupyterLab extension loaded from /share/apps/anaconda3-2019.03/lib/python3.7/site-packages/jupyterlab
[I 11:43:25.289 NotebookApp] JupyterLab application directory is /share/apps/anaconda3-2019.03/share/jupyter/lab
[I 11:43:25.296 NotebookApp] [nb_conda] enabled
[I 11:43:25.296 NotebookApp] Serving notebooks from local directory: /share/zrc/aa3301
[I 11:43:25.296 NotebookApp] The Jupyter Notebook is running at:
[I 11:43:25.296 NotebookApp] http://10.198.24.59:8959/?token=9e73528834e240a01eeffe298d35a04d3d670bbd8b6b4b87
[I 11:43:25.297 NotebookApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation).
[C 11:43:25.307 NotebookApp]
To access the notebook, open this file in a browser:
file:///share/zrc/aa3301/.local/share/jupyter/runtime/nbserver-222039-open.html
Or copy and paste one of these URLs:
http://10.198.24.59:8959/?token=9e73528834e240a01eeffe298d35a04d3d670bbd8b6b4b87
[I 11:43:48.650 NotebookApp] 302 GET /?token=9e73528834e240a01eeffe298d35a04d3d670bbd8b6b4b87 (128.59.216.48) 1.55ms |
In the example above we use commands to determine the ip and make a random port number. The notebook is accessed via the url near the bottom as instructed. In this approach the notebook will end when the job expires (we asked it to last for an hour in the first command) or when the application is quit (using CTRL + C) in the terminal.