sysimage_creator

• This repository aims to provide scripts that create sysimage that accelerates initialization of IJulia kernel.
• It also will reduce latency when working locally with packages that has a high startup time e.g. Plots.jl or StatsPlots.jl .

Usage: For 今北産業(TL;DR) users

$ git clone https://github.com/terasakisatoshi/sysimage_creator.git
$ pip install jupyter jupytext nbconvert ipykernel
$ cd sysimage_creator && make && jupyter notebook

Then open your jupyter notebook and select a kernel named Julia-sys 1.6.3

Usage: For reasonable people

Step 1: Install dependencies

• Almost people can skip this step because your are trying to improve your Jupyter IJulia.jl, to You know what to do.
• Install Julia and Python
• Let's install jupyter (or jupyterlab instead) and jupytext via:

$ pip install jupyter jupytext
$ pip install nbconvert ipykernel cython # I'm not sure, but you will need on Windows.

• After that, let's moving on to Step2!!!

Step1-1: Help! I'm new to any kind of programming language.

• All right. Welcome to Julia! First of all please install Julia from here. Please see platform specific instructions for further installation instructions and if you have trouble installing Julia. You'll learn how to add a path of a program for Julia. Open your terminal and type julia command.

$ julia
               _
   _       _ _(_)_     |  Documentation: https://docs.julialang.org
  (_)     | (_) (_)    |
   _ _   _| |_  __ _   |  Type "?" for help, "]?" for Pkg help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 1.6.3 (2021-09-23)
 _/ |\__'_|_|_|\__'_|  |  Official https://julialang.org/ release
|__/                   |

julia> # congrats!
julia> exit() # exit from julia REPL
$ julia # you can start again.

• Moving on to the next step. Let's install PyCall and IJulia and then your environment can initialize jupyter notebook

julia> ENV["PYTHON"]=""; ENV["JUPYTER"]=""
julia> using Pkg; Pkg.add(["PyCall", "IJulia", "Conda"])
julia> using Conda; Conda.add(["jupyter", "jupytext"], channel="conda-forge")

• Tips: you don't have to copy code above line by line. Copy the whole 3 lines. Don't hesitate to include prompt julia>. Then just do paste to your julia REPL.
• Tips: Setting ENV["PYTHON"]=""; ENV["JUPYTER"]="" makes julia select Python provided via Conad.jl. Conda.jl uses the miniconda Python environment, which only includes conda and its dependencies. If you have LITTLE experience with Python, just follow the instructions above is fine.
• Tips: Ah, you've remembered you can use Python and Jupyter from your termina? e.g.

$ python
>>>

$ pip install numpy

or whatever

$ jupyter notebook

If so, you may consider do the following command:

julia> run(`pip install jupyter jupytext nbconvert ipykernel`)
julia> ENV["PYTHON"]=Sys.which("python3"); ENV["JUPYTER"]=Sys.which("jupyter")
julia> using Pkg; Pkg.build(["PyCall", "IJulia"])

What does it do? Well, read the code: deps/build.jl.

Anyway, after finished the installation, let's initialize Juptyer notebook:

julia> using IJulia; notebook(dir=pwd())

Step 2: Create sysimage

• Ah... also make sure you can use $ make command in your terminal.
• Just run make. It will make sysimage named sys.{DLEXT}, where DLEXT is dylib, dll or so.

$ make
...
...
...
$ ls
sys.dylib # e.g. macOS users

Testout sysimage

Case 1: from terminal

• You can feel how much time we can reduce the latency of loading Julia packages when we use our sysimage:

$ cat benchmark.jl
# use standard julia
@time run(`jupytext --to ipynb --execute testout_naive.jl`)
# use sys.${DLEXT} as sysimage
@time run(`jupytext --to ipynb --execute testout_sys.jl`)
$ julia --project=@. benchmark.jl

or just run make test :D.

Case 2: from jupyter

• Open Jupyter Notebook as always:

$ jupyter notebook

• Then you'll see New kernel for Julia named Julia-sys 1.6.3.

• Please select it. This kernel is generated by installkernel.jl which is stored in this repository.

$ cat ~/Library/Jupyter/kernels/julia-sys-1.6/kernel.json
{
  "display_name": "Julia-sys 1.6.3",
  "argv": [
    "/Applications/Julia-1.6.app/Contents/Resources/julia/bin/julia",
    "-i",
    "--color=yes",
    "--project=@.",
    "--sysimage=sys", # <--- this `sys` is a name of sysimage
    "/Users/<your-user-name>/.julia/packages/IJulia/e8kqU/src/kernel.jl",
    "{connection_file}"
  ],
  "language": "julia",
  "env": {},
  "interrupt_mode": "signal"
}

• If you click testout_sys.jl file, Jupyter recognize this file as notebook, and initialize it with option --sysimage=sys.
• Here is a result of running testout_sys.jl using our sysimage:

• Here is a result of running testout_naive.jl using standard sysimage, which is so slow: