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Run Jupyterq notebook with limit CPU cores
Hi guys, I try to use Jupyter kernel for kdb+ but meet following “License check failed” problem. I think this is because my non-commercial license has a constraint on max CPU cores.<div>
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When I directly run q in the command line, it raised “license error: cores” error. And “taskset -c 0-15 ~/q/l64/q” solves this issue. My question is: is there anyway I can limit my cpu cores when starting a KDB+ jupyter kernel, so that I can use q with jupyter notebook normally on my machine?
Thank you very much!
~$ ~/q/l64/q
KDB+ 4.1 2024.07.08 Copyright (C) 1993-2024 Kx Systems
l64/ 48(24)core 579514MB xxxx ubuntu-xxxxx-amd64-base xx.xx.xx.xx xxxxx@gmail.com KDB PLUS TRIAL #5020784
'license error: cores
~$ taskset -c 0-15 ~/q/l64/q
KDB+ 4.1 2024.07.08 Copyright (C) 1993-2024 Kx Systems
l64/ 16(24)core 579514MB xxxx ubuntu-xxxxx-amd64-base xx.xx.xx.xx xxxxx@gmail.com KDB PLUS TRIAL #5020784
q)
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github.com
GitHub - KxSystems/jupyterq: Jupyter kernel for kdb+
Jupyter kernel for kdb+. Contribute to KxSystems/jupyterq development by creating an account on GitHub.
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2 Replies
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You could start Jupyter with a core restriction:
taskset -c 0-15 jupyter notebook
Or see this answer I posted previously: (you could choose 0-15 rather than 0,1)
https://stackoverflow.com/a/77481466/4256419
Edit the file https://github.com/KxSystems/jupyterq/blob/master/kernelspec/kernel.json
{ "argv": [ "taskset", "-c", "0,1", "q", "jupyterq_kernel.q", "-cds", "{connection_file}" ], "display_name": "Q (kdb+)", "language": "q", "env": {"JUPYTERQ_SERVERARGS":"","MPLBACKEND":"Agg"} }If you have already installed you can ensure Jupyter picks up the changes by reinstalling the kernel:
python -m jupyter kernelspec install --user --name=qpk /path/to/kernelspecAnd you can validate in a notebook with
system"taskset -pc ",string .z.i-
Thank you rocuinneagain! I missed the naive answer😇 taskset is enough to solve my issue.
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