Use filelock while starting a new kernel.#327
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hodgestar wants to merge 3 commits intojupyter:mainfrom
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Use filelock while starting a new kernel.#327hodgestar wants to merge 3 commits intojupyter:mainfrom
hodgestar wants to merge 3 commits intojupyter:mainfrom
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This PR uses a lock to try and avoid this error when running in a GitHub action: ``` zmq.error.ZMQError: Address already in use (addr='tcp://127.0.0.1:45769') ``` This is a bit of a shot in the dark because I can't reproduce it locally. This is related to #2387, but is not necessarily a full fix as I believe there is more than one thing going on there. *** Inspired by jupyter/nbclient#327
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Oct 13, 2025
This PR uses a lock to try and avoid this error when running in a GitHub action: ``` zmq.error.ZMQError: Address already in use (addr='tcp://127.0.0.1:45769') ``` This is a bit of a shot in the dark because I can't reproduce it locally. This is related to Qiskit#2387, but is not necessarily a full fix as I believe there is more than one thing going on there. *** Inspired by jupyter/nbclient#327
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I use nbmake and pytest-xdist to run many notebook tests in parallel on a CI machine with 64 cores. This frequency triggers the long standing
jupyter_clientbug jupyter/jupyter_client#487 whose proposed solution is detailed in a Jupyter enhancement proposal accepted in 2023 -- jupyter/enhancement-proposals#66.When launch many local kernels, the obvious solution seems to be to hold a file lock during kernel start up. This PR implements that solution using https://github.com/tox-dev/filelock.
I've put up this PR without any tests yet as a request for feedback.
Questions:
Many thanks to wandb/wandb#8835 for the idea behind the PR.