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sagemathinc / cocalc

CoCalc: Collaborative Calculation in the Cloud
https://CoCalc.com
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query projects server about running jupyter notebook instances #3903

Closed haraldschilly closed 3 months ago

haraldschilly commented 5 years ago

From within the command line, it is hard to know which jupyter notebook instance corresponds to which file. The goal of this ticket is to make this easier, and my idea is to add an endpoint to that project server, that returns a JSON datastructure exposing the internal state of the project hub related to these notebooks. Then, someone can use that (via jq or whatever) to clean up old notebook instances, etc.

Req: ZD 6680

williamstein commented 5 years ago

As is, this issue doesn't really make sense, because if you kill the kernel process, the local_hub will just immediately start another one. We would really need the local http server (or something?) to allow you to "close and halt" a notebook.

quantumFlame commented 5 years ago

As is, this issue doesn't really make sense, because if you kill the kernel process, the local_hub will just immediately start another one. We would really need the local http server (or something?) to allow you to "close and halt" a notebook.

I did some experiments. After stop the process, a new process didn't start until I execute codes in the notebook. If I just leave the notebook there or edit without executing, there is no new kernel started. I think this is reasonable?

williamstein commented 5 years ago

I did some experiments. After stop the process, a new process didn't start until I execute codes in the notebook.

Cool -- I didn't realize that! Yes, that seems like reasonable behavior.

William

quantumFlame commented 5 years ago

As an addition question, I noticed that there are also other modules besides jupyter, such as terminal, markdown, latex editor, etc. Are they working in the same way as jupyter? I mean, if the issue was solved, can we track the pid corresponding to a file no matter it is .ipynb, .term, or .md ?

williamstein commented 5 years ago

Are they working in the same way as jupyter?

No.

I mean, if the issue was solved, can we track the pid corresponding to a file no matter it is .ipynb, .term, or .md ?

There's no separate process for most file types (e.g., markdown, latex etc.). The state in memory used by these files is cleaned up after all users close the file. There's no automatic idle timeout for them.

There are pid's for each terminal (and each frame if you split one for a terminal). Killing the terminal pid will definitely spawn another process after a short pause. There's no specific idle timeout for this -- they just stay running as long as the project runs.

williamstein commented 3 months ago

Closing with a similar remark to https://github.com/sagemathinc/cocalc/issues/3884

This would be an interesting idea to make part of the API. There's not likely to be much interest, since in 5 years after making these tickets, there's been no activity. But we'll see.