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Julia: Difference between revisions
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The first time you add a package to a Julia project (using <code>Pkg.add</code> or the package mode), the package will be downloaded, installed in <code>~/.julia</code>, and pre-compiled. The same package can be added to different projects, in which case the data in <code>~/.julia</code> will be reused. Different versions of the same package can be added to different projects; the required package versions will coexist in <code>~/.julia</code>. (Compared to Python, Julia projects replace “virtual environments” while avoiding code duplication.) | The first time you add a package to a Julia project (using <code>Pkg.add</code> or the package mode), the package will be downloaded, installed in <code>~/.julia</code>, and pre-compiled. The same package can be added to different projects, in which case the data in <code>~/.julia</code> will be reused. Different versions of the same package can be added to different projects; the required package versions will coexist in <code>~/.julia</code>. (Compared to Python, Julia projects replace “virtual environments” while avoiding code duplication.) | ||
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From Julia 1.6 onwards, Julia packages include their binary dependencies (such as libraries). There is therefore no need to load any software module, and we recommend not to. | From Julia 1.6 onwards, Julia packages include their binary dependencies (such as libraries). There is therefore no need to load any software module, and we recommend not to. | ||
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With Julia 1.5 and earlier, you may run into problems if a package depends on system-provided binaries. For instance, [https://github.com/JuliaIO/JLD.jl JLD] depends on a system-provided HDF5 library. On a personal computer, Julia attempts to install such a dependency using [https://en.wikipedia.org/wiki/Yum_(software) yum] or [https://en.wikipedia.org/wiki/APT_(Debian) apt] with [https://en.wikipedia.org/wiki/Sudo sudo]. This will not work on a Compute Canada cluster; instead, some extra information must be provided to allow Julia's package manager (Pkg) to find the HDF5 library. | With Julia 1.5 and earlier, you may run into problems if a package depends on system-provided binaries. For instance, [https://github.com/JuliaIO/JLD.jl JLD] depends on a system-provided HDF5 library. On a personal computer, Julia attempts to install such a dependency using [https://en.wikipedia.org/wiki/Yum_(software) yum] or [https://en.wikipedia.org/wiki/APT_(Debian) apt] with [https://en.wikipedia.org/wiki/Sudo sudo]. This will not work on a Compute Canada cluster; instead, some extra information must be provided to allow Julia's package manager (Pkg) to find the HDF5 library. | ||