Julia
Description
Julia is a high-level, high-performance dynamic programming language for numerical computing. It provides a sophisticated compiler, distributed parallel execution, numerical accuracy, and an extensive mathematical function library.
For a quick introduction and tutorial, see https://github.com/csc-training/julia-introduction
Available
Puhti
- 1.3.1, 1.1.1 compiled with Intel Math Kernel Library (MKL)
- 1.3.1, 1.1.1 from pre-compiled binaries
License
Free and open source under MIT license.
Usage
Loading Modules
To load a module for a stable version of Julia, use the following command
$ module load julia
If you need to install and use ARPACK package, it is recommended to use pre-compiled binaries instead.
$ module load julia/1.1.1-pre-compiled
Interactive use
After loading the Julia module, it can be run interactively simply by typing
$ julia
If more resources are required, one can request an interactive node directly on Puhti with
$ srun --ntasks=1 --time=00:10:00 --mem=4G --pty --account=project_id --partition=small julia
Installing packages
You can access to the package manager by pressing "]" during the interactive session. The packages are added to the project with an 'add' command.
julia> ]
(v1.1) pkg>
(v1.1) pkg> add Example
After adding a package, it can be loaded in Julia:
julia> using Example
Packages are by default installed in the directory '~/.julia/', but the target can be changed with an environmental variable 'JULIA_PKGDIR'.
$ export JULIA_PKGDIR=/your/directory
NOTE: Packages that work for one version of Julia might not work at all for another. Check the required version number.
More information about Julia's package manager you can found from its documentation.
Serial batch job
Sample single-processor Julia batch job on Puhti
#!/bin/bash
#SBATCH --job-name=julia_serial
#SBATCH --account=<project>
#SBATCH --partition=small
#SBATCH --time=0:10:0
#SBATCH --ntasks=1
#SBATCH --mem-per-cpu=1000
module load julia
srun julia my_script.jl
This runs the script my_script.jl one time using one cpu-core. You can find more information about batch jobs on Puhti from the user guide.