Cling kernel for Jupyter on Windows does not work

nickolayl · February 18, 2024, 6:16am

Dear Root Community,

I have the following problem: C++ cling kernels for Jupyter fail to run in Jupyter. I can see the icons for all 4 kernels but when I try any of the C++ cling kernels they fail to start with the error. Please see the screenshot attached.

EXPECTED BEHAVIOUR:
C++ cling kernels for Jupyter run in Jupyter.

ACTUAL BEHAVIOUR:
C++ cling kernels for Jupyter won’t start.

Error Starting Kernel

[WinError 2] The system cannot find the file specified

STEPS TO REPRODUCE

install Windows 11 version 23H2
follow official instructions on how to build cling on Windows. Build for llvm, clang and cling succeeded. cling --version shows 1.1~dev. I confirm that I can code freely from command line.
install jupyter with mamba (conda) in a separate environment.
make cling available through PATH along with everything that is in the build folder resulted from step 2.
follow the official instructions on how to install C++ cling kernels for Jupyter from github (githubcom/root-project/cling/tree/aa6d4924b5c15290f4b7f019193daf417d81c121/tools/Jupyter) can’t post a full link due to the rules.
No errors. Kernels appear in Jupyter’s interface.

Danilo · February 19, 2024, 6:57am

Hi Nikolay,

Welcome to the ROOT community!
I add in the loop our Win expert @bellenot .

Cheers,
D

bellenot · February 19, 2024, 10:12am

I can reproduce the error, will try to figure out what is the problem

bellenot · February 19, 2024, 2:15pm

So I don’t know if this was working on Windows. I know the ROOT notebook works, but never tried cling. Maybe @vvassilev knows how to debug this

nickolayl · February 24, 2024, 9:51am

@bellenot Bertrand, thank you for looking into it. Did you have a chance to look deeper into it? Any advise?

bellenot · February 26, 2024, 7:41am

Not yet, and I was hoping @vvassilev could give advice where to start from…

vvassilev · February 26, 2024, 2:11pm

Hi all. Is that cling standalone or xeus-cling?

nickolayl · February 26, 2024, 4:19pm

Hi! This is cling standalone. Thank you for hopping in!

vvassilev · February 26, 2024, 4:34pm

AFAIK, the jupyter library in cling needs some glue to connect to the jupyter system. Is that what we are seeing now?

system · March 11, 2024, 4:35pm

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