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alvas
Asked: 2017-04-02 18:11:01 +0800 CST

How to install cling kernel in Jupyter notebook

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From How to install cling?, I've downloaded the pre-installed binaries for cling-ubuntu on https://root.cern.ch/download/cling/

$ wget https://root.cern.ch/download/cling/cling_2017-03-30_ubuntu16.tar.bz2
$ dtrx cling_2017-03-30_ubuntu16.tar.bz2
$ cd cling_2017-03-30_ubuntu16
$ ls
~/cling_2017-03-30_ubuntu16/$ ls
bin include  lib  libexec  share
~/cling_2017-03-30_ubuntu16/$ cd share/cling/Jupyter/kernel/
~/cling_2017-03-30_ubuntu16/share/cling/Jupyter/kernel/$ ls
build        cling-cpp14  cling.ipynb           clingkernel.py  scripts
cling-cpp11  cling-cpp17  clingkernel.egg-info  __pycache__     setup.py

On the documentation, it says:

pip install -e .

But when it comes to the step:

# register the kernelspec for C++17/C++14/C++11:
# the user can install whichever kernel(s) they

Which C++ version should I use? I didn't have any of those installed? I use gcc to compile my c++ code usually.

And even when I tried installing all with:

jupyter-kernelspec install cling-c++17
jupyter-kernelspec install cling-c++14
jupyter-kernelspec install cling-c++11

The Jupyter notebook shows the kernel but at the home page but when I create a new notebook, the kernel either dies or keeps restarting.

software-installation

2 Answers

  1. I tried your steps and also ran into problems. I had better luck building from source, installing the built kernel, and running with that. I don't have details on your build; make sure you remove any previous kernels from Jupyter before trying this. To do this, based on your input above, use the following commands:

    1. ~/cling_2017-03-30_ubuntu16/share/cling/Jupyter/kernel
    2. jupyter kernelspec uninstall cling-cpp11

    Now, here are my build instructions (I'm running Ubuntu 16.04):

    1. mkdir -p ~/builds && cd ~/builds
    2. wget https://root.cern.ch/download/cling/cling_2017-04-15_sources.tar.bz2
    3. tar jxf cling_2017-04-15_sources.tar.bz2
    4. mv src cling_2017-04-15
    5. mkdir -p ~/builds/cling_2017-04-15/build
    6. cd ~/builds/cling_2017-04-15/build
    7. cmake -DCMAKE_BUILD_TYPE=Release ../
    8. make -j8
    9. sudo make install
    10. sudo ldconfig
    11. cd /usr/local/share/cling/Jupyter/kernel
    12. sud pip3 install -e .
    13. sudo jupyer kernelspec install cling-cpp11
    14. cd ~ && jupyter notebook

    Now, here's a simple example in Jupyter you can try. Cling is evolving, so check out the doc for the latest syntax.

    A simple Cling-Jupyter example.

    • 4

  2. There may be a discrepancy in the kernelspec directory naming between those docs and the current code. It seems they now use "cpp" instead of "c++". Using e.g.

    jupyter-kernelspec install cling-cpp11

    worked better on my cling_2017-03-30_ubuntu16 install.

    • 1