Julia precompile recs. and add uArch to hardware

Gemfile

@@ -5,3 +5,5 @@ gem "jekyll", "~> 4.3.3"
 gem "html-proofer", "~> 5.0"
 
 gem "just-the-docs", "~> 0.8.2"
+
+gem "jekyll-relative-links", "~> 0.7.0"

_config.yml

@@ -13,3 +13,6 @@ ga_tracking: G-X2LPWRLJ7X
 includes:
   head:
     - head_custom.html
+
+plugins:
+  - jekyll-relative-links

about/hardware.md

@@ -26,10 +26,10 @@ math: mathjax2
 | Largemem |  3  | AMD 9654 |             | 768 GB | 1.9TB     | 13,989  |
 | CPU      | 25  | AMD 9654 |             | 368 GB | 1.9TB     | 12,998  |
 
-| CPU                                                                    | Cores | Threads | Base   | Boost              | L3 Cache |
-| ---------------------------------------------------------------------- | ----- | ------- | ------ | ------------------ | -------- |
-| [AMD Epyc 9654 CPU](https://www.amd.com/en/products/cpu/amd-epyc-9654) | 96    | 192     | 2.6GHz | 3.55GHz (All Core) | 384MB    |
-| [AMD Epyc 7513 CPU](https://www.amd.com/en/products/cpu/amd-epyc-7513) | 32    | 64      | 2.6GHz | 3.65GHz (Max)      | 128MB    |
+| CPU                                                                                                                                | μArch | Cores | Threads | Base   | Boost              | L3 Cache |
+| ---------------------------------------------------------------------------------------------------------------------------------- | ----- | ----- | ------- | ------ | ------------------ | -------- |
+| [AMD Epyc 9654 CPU](https://www.amd.com/en/products/processors/server/epyc/4th-generation-9004-and-8004-series/amd-epyc-9654.html) | Zen4  | 96    | 192     | 2.6GHz | 3.55GHz (All Core) | 384MB    |
+| [AMD Epyc 7513 CPU](https://www.amd.com/en/products/processors/server/epyc/7003-series/amd-epyc-7513.html)                         | Zen3  | 32    | 64      | 2.6GHz | 3.65GHz (Max)      | 128MB    |
 
 > Nodes are partitioned by *threads*, not *cores*. Picking 1 or a multiple of 2 is advisable; see [sbatch's](https://slurm.schedmd.com/sbatch.html) `--distribution` flag
 

about/user_software.md

@@ -147,3 +147,53 @@ packages:
       scalapack: [amdsclapack, netlib-scalapack]
 
 ```
+
+## Julia
+
+## Minimizing Redundant Precompilation
+
+As Artemis is a [heterogeneous cluster](./hardware.md#cluster-architecture), switching between different partitions can trigger frequent precompilation, as Julia attempts to recompile for the current microarchitecture. To avoid this set [`JULIA_CPU_TARGET`](https://docs.julialang.org/en/v1/manual/environment-variables/#JULIA_CPU_TARGET) to an appropriate setting.
+
+For example, within your `~/.bashrc` or equivalent, put:
+
+```shell
+export JULIA_CPU_TARGET="generic;znver4,clone_all;znver3,clone_all;haswell"
+```
+
+This will instruct Julia to compile for Zen4 (Most Worker Nodes), Zen3 (A100 Nodes) and haswell (Head node), with a generic CPU target as a fallback. This will increase the size of `~/.julia/compiled` as 3 sets of system and package images will now need to be stored. For more information see the [Julia docs](https://docs.julialang.org/en/v1/manual/environment-variables/#JULIA_CPU_TARGET).
+
+
+### Example Precompile Job Script
+```shell
+#!/bin/bash
+#SBATCH -p venkvis-cpu
+#SBATCH --cpus-per-task 4
+#SBATCH --mem-per-cpu 1800M
+#SBATCH --time=0:20:00
+set -x
+my_job_header
+
+# Configure Julia
+export JULIA_CPU_TARGET="generic;znver4,clone_all;znver3,clone_all;haswell"
+export JULIA_PKG_PRECOMPILE_AUTO=0                        # Disable automatic precompilation so we control when it happens (Mainly for MPI)
+export JULIA_NUM_PRECOMPILE_TASKS=$SLURM_CPUS_ON_NODE     # Limit precompilation tasks to the number of CPUs
+
+# Uncomment if using MPI.jl
+# module --ignore_cache load openmpi/4.1.6
+# julia --color=no --startup-file=no --project -e 'using MPIPreferences; MPIPreferences.use_system_binary()'
+
+# Precompile the Project
+julia --color=no --startup-file=no --project -e 'using Pkg; Pkg.resolve(); Pkg.instantiate(); Pkg.precompile(timing=true)'
+```
+
+The job script would then look like:
+
+```shell
+# [Job Header Goes Here]
+
+export JULIA_CPU_TARGET="generic;znver4,clone_all;znver3,clone_all;haswell"
+
+julia --startup-file=no --project ...
+```
+
+> Note: `--startup-file=no` is needed to avoid loading packages from your base environment (i.e. Revise) and