spmvtest2(1)

💖 spmvtest2 — the two-dimensional Laplacian SpMV glow-up 💖

okay bestie, so this is spmvtest2, one of the Utility Commands, and it's literally the moment where you find out how fast your sparse matrix-vector multiply is actually going. no cap.

✨ SYNOPSIS ✨

spmvtest1 m n iter [matrix_type]

(not me showing you the synopsis exactly as it lives in the page — copy-paste faithful, periodt 💅)

🌸 DESCRIPTION 🌸

so here's the vibe: this program computes the matrix-vector multiply of a discretized two dimensional Laplacian of size mn, using the five point central difference scheme, and a vector (1, ..., 1)^T. iconic combo, fr fr.

then it measures the FLOPS performance as the average of iter iterations. that's the whole point. that's the main character moment. 🫶

and if you need to, you can pass one of these values as matrix_type:

• 0 — measure the performance for the available matrix storage formats 👑
• 1-11 — the number of the matrix storage format (yes, that's the actual number of the format, pick your fave)

quick vocab check because we're being thorough: m and n represent the numbers of the grid points in each dimension. slay.

📖 for more information, see the Lis User Guide. go read it, it's giving academic but make it useful.

💀 EXIT STATUS 💀

the following exit values are returned:

• 0 — the process is normally terminated 💖 everything ate, no crumbs
• unspecified — an error occurred 😭 we don't talk about it

🦋 SEE ALSO 🦋

• lis(3)
• lsolve(1)
• esolve(1)
• hpcg_kernel(1)
• hpcg_spmvtest(1)
• spmvtest1(1)
• spmvtest2b(1)
• spmvtest3(1)
• spmvtest3b(1)
• spmvtest4(1)
• spmvtest5(1)

and the link, obviously: http://www.ssisc.org/lis/ ✨

okay and for the sign-off bestie — this lil masterpiece is a Man Page, dated 26 Mar 2014, and it belongs to spmvtest2(1). vintage but still serving. mwah 💅🎀