Setup Julia

Install Julia

Install Julia with the juliaup installer.

Linux/MacOS

curl -fsSL https://install.julialang.org | sh -s -- -y

Windows

winget install julia -s msstore

Alternatively, download and install Julia official binaries.

winget install JuliaLang.Julia

Post-install configurations

Auto-activate local projects

Set environment variable JULIA_PROJECT=@. to let Julia automatically load the closest upstream Project.toml and activate the environment.

~/.profile

export JULIA_PROJECT=@.

Info

IJulia.jl, the Julia kernel for Jupyter notebooks, sets JULIA_PROJECT=@. by default. Thus, Jupyter notebooks load their local Julia environments automatically.

Warning

Loading local environments unconditionally is unsafe for untrusted sources, as shown in Nefarious.jl.
That is why Julia does not run julia --project=@. by default.

Fully utilize CPU threads

Set environment variable JULIA_NUM_THREADS=auto to let Julia use all CPU threads.

~/.profile

export JULIA_NUM_THREADS=auto

Customize Python and Conda location

Point the environment variable CONDA_JL_HOME to your Conda path. Conda.jl and PyCall.jl will take the preinstalled Conda instead of downloading a standalone one. For example,

~/.profile

export CONDA_JL_HOME="${HOME}/conda"

For PythonCall.jl, set the following environment variables:

export JULIA_CONDAPKG_BACKEND="Null"
export JULIA_PYTHONCALL_EXE="${HOME}/conda/bin/python"

Load packages at Julia REPL startup

Add the following lines to ~/.julia/config/startup.jl after Revise.jl and OhMyREPL.jl are installed

~/.julia/config/startup.jl

atreplinit() do repl
    try
        @eval using OhMyREPL
        @eval using Revise
    catch e
        @warn "Error initializing" exception=(e, catch_backtrace())
    end
end

For IJulia (Jupyter notebooks) to use Revise, add the following lines to ~.julia/config/startup_ijulia.jl

~/.julia/config/startup_ijulia.jl

try
    @eval using Revise
catch e
    @warn "Error initializing Revise" exception=(e, catch_backtrace())
end

Or run the following commands (heredoc in Linux) to create these two files at once

mkdir -p ~/.julia/config/ && cat >  ~/.julia/config/startup.jl << END
atreplinit() do repl
    try
        @eval using OhMyREPL
        @eval using Revise
    catch e
        @warn "Error initializing" exception=(e, catch_backtrace())
    end
end
END

mkdir -p ~/.julia/config/ && cat >  ~/.julia/config/startup_ijulia.jl << END
try
    @eval using Revise
catch e
    @warn "Error initializing Revise" exception=(e, catch_backtrace())
end
END

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