What a note can carry

Fence a block and name the language. Copy sits on the block. Long lines scroll inside the fence; they do not push the column.

#!/bin/bash
#SBATCH --job-name=ping
#SBATCH --ntasks=4
#SBATCH --time=00:10:00
srun ./a.out

Inline names stay in a code span: srun, MPI_Init, $SLURM_NTASKS.

#include <mpi.h>
int main(int argc, char** argv) {
  MPI_Init(&argc, &argv);
  MPI_Finalize();
}

That MPI_Init / MPI_Finalize pair is a subsubsection: enough to compile, not a solver.

A mermaid fence becomes a figure. Flowcharts, sequence charts, and the rest of the Mermaid dialects are fair game.

Inline TeX sits in dollar signs: a naive GEMM is $2n^3$ flops.

Displayed expressions use a math fence, $$…$$, or \[…\].

Strong scaling is the ratio of serial time to $p$ times parallel time. If $E(p)$ falls over while the solver is "MPI bound", time the I/O.

A Markdown image is a figure. Put files in public/media/ and link them with /media/…. An https:// URL to a .png, .jpg, .gif, .webp, or .avif is also a figure. Still rasters are compressed on the fly. Click a still for a lightbox. GIFs animate in place and in the lightbox. A .mp4 or .webm is a video.

A Markdown link is a link. Internal pages use a path (/notes/…). External pages use https://… and open in a new tab. Bare URLs also become links: https://slurm.schedmd.com/sbatch.html.