168 lines
6.8 KiB
Rust
168 lines
6.8 KiB
Rust
//! `vectorcraft-cli perf`: the performance budgets (plan §4) measured on a synthetic document.
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//!
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//! Each row is the median of several runs. Timings are wall-clock: on a busy machine (load
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//! average above the core count) they are noise, and the report says so.
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use std::time::Instant;
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use serde_json::json;
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use vectorcraft_color::{Color, Paint};
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use vectorcraft_doc::{Appearance, Document, Node, hit};
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use vectorcraft_geom::{Affine, Point, Rect, shapes};
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use vectorcraft_render::{RenderOptions, Renderer};
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/// Deterministic xorshift in 0..1.
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struct Rng(u64);
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impl Rng {
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fn next(&mut self) -> f64 {
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self.0 ^= self.0 << 13;
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self.0 ^= self.0 >> 7;
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self.0 ^= self.0 << 17;
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(self.0 % 1_000_000) as f64 / 1_000_000.0
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}
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}
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/// `n` mixed paths (ellipses with strokes, translucent rectangles, stroked stars) on a 1600×1200 page.
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pub fn synthetic(n: usize) -> Result<Document, String> {
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let mut d = Document::new(1600.0, 1200.0);
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let l = d.layers.first().map(|l| l.id);
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let mut r = Rng(42);
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for i in 0..n {
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let (x, y, s) = (r.next() * 1600.0, r.next() * 1200.0, 3.0 + r.next() * 22.0);
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let c = Color::rgb(r.next() as f32, r.next() as f32, r.next() as f32);
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let id = d.alloc_id();
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let mut node = match i % 3 {
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0 => Node::path(
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id,
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shapes::ellipse(Rect::from_center_size(Point::new(x, y), (2.0 * s, 2.0 * s))),
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Appearance::basic(Paint::solid(c), Paint::solid(Color::BLACK), 0.5),
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),
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1 => Node::path(id, shapes::rectangle(Rect::new(x, y, x + 2.0 * s, y + s)), Appearance::basic(Paint::solid(c), Paint::None, 0.0)),
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_ => Node::path(id, shapes::star(Point::new(x, y), s, s / 2.0, 5, 0.0), Appearance::basic(Paint::None, Paint::solid(c), 2.0)),
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};
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if i % 3 == 1 {
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node.opacity = 0.8;
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}
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d.insert(l, usize::MAX, node).map_err(|e| format!("building the synthetic document: {e}"))?;
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}
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Ok(d)
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}
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fn median_ms(runs: usize, mut f: impl FnMut()) -> f64 {
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let mut v: Vec<f64> = (0..runs)
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.map(|_| {
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let t = Instant::now();
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f();
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t.elapsed().as_secs_f64() * 1000.0
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})
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.collect();
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v.sort_by(f64::total_cmp);
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v.get(v.len() / 2).copied().unwrap_or(0.0)
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}
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/// 1-minute load average (macOS / Linux), if available.
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fn load_average() -> Option<f64> {
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let out = std::process::Command::new("sysctl").args(["-n", "vm.loadavg"]).output().ok().filter(|o| o.status.success());
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let text = match out {
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Some(o) => String::from_utf8_lossy(&o.stdout).to_string(),
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None => std::fs::read_to_string("/proc/loadavg").ok()?,
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};
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text.split_whitespace().map(|t| t.trim_matches(|c| c == '{' || c == '}')).find_map(|t| t.parse().ok())
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}
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pub fn run(args: &[String]) -> Result<(), String> {
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let mut n = 50_000usize;
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let mut it = args.iter();
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while let Some(a) = it.next() {
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match a.as_str() {
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"--paths" => n = it.next().and_then(|v| v.parse().ok()).ok_or("--paths needs a number")?,
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other => return Err(format!("unknown perf option `{other}`")),
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}
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}
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let cores = std::thread::available_parallelism().map_or(1, |c| c.get());
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let load = load_average();
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println!("VectorCraft performance budgets — {n} paths, {cores} cores, load average {}", load.map_or("?".into(), |l| format!("{l:.1}")));
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let noisy = load.is_some_and(|l| l > cores as f64 * 0.75);
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if noisy {
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println!("WARNING: the machine is busy; wall-clock timings below are not trustworthy.");
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}
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let t = Instant::now();
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let doc = synthetic(n)?;
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println!(" (built in {:.0} ms)", t.elapsed().as_secs_f64() * 1000.0);
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let mut rows: Vec<(&str, f64, f64)> = vec![];
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let opts = RenderOptions::default();
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let mut r = Renderer::new();
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let fit = Affine::scale(1.6);
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r.render(&doc, 2880, 1800, fit, &opts);
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// The canvas never waits for these: while panning/zooming it shows the last frame reprojected
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// and re-renders in the background, so the budget is for that refresh to land quickly.
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rows.push(("render: fit page, 2880×1800", median_ms(5, || drop(r.render(&doc, 2880, 1800, fit, &opts))), 100.0));
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let mut dx = 0.0;
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rows.push((
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"render: background refresh after a pan",
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median_ms(9, || {
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dx += 7.0;
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drop(r.render(&doc, 2880, 1800, Affine::translate((dx, 0.0)) * fit, &opts));
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}),
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100.0,
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));
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let zoom = Affine::scale(6.4) * Affine::translate((-600.0, -400.0));
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r.render(&doc, 2880, 1800, zoom, &opts);
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// Zoomed in, culling leaves few objects: this one should fit a frame.
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rows.push(("render: 400% zoom, 2880×1800", median_ms(5, || drop(r.render(&doc, 2880, 1800, zoom, &opts))), 16.0));
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let mut rng = Rng(7);
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let points: Vec<Point> = (0..200).map(|_| Point::new(rng.next() * 1600.0, rng.next() * 1200.0)).collect();
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let hits = median_ms(3, || {
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for p in &points {
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drop(hit::hit_test(&doc, *p, hit::HitOptions::default()));
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}
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}) / points.len() as f64;
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rows.push(("hit test (per click)", hits, 2.0));
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let mut bytes = vec![];
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rows.push(("save .vectorcraft", median_ms(3, || bytes = vectorcraft_format::save_file(&doc)), 300.0));
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let mut failed = None;
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let open = median_ms(3, || {
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if let Err(e) = vectorcraft_format::load(&bytes) {
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failed = Some(format!("open .vectorcraft: {e}"));
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}
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});
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rows.push(("open .vectorcraft", open, 300.0));
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let svg_opts = vectorcraft_svg::ExportOptions::default();
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rows.push(("export SVG", median_ms(3, || drop(vectorcraft_svg::export(&doc, &svg_opts))), 500.0));
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// Pathfinder Unite on 1,000 overlapping paths.
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let unite = median_ms(3, || {
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let mut s = vectorcraft_engine::Session::new();
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let r = synthetic(1000).and_then(|d| {
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s.add_document(d, None);
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s.execute("select.all", &json!({})).and_then(|_| s.execute("object.pathfinder.unite", &json!({}))).map_err(|e| e.to_string())
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});
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if let Err(e) = r {
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failed = Some(format!("Pathfinder Unite: {e}"));
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}
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});
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rows.push(("Pathfinder Unite, 1,000 paths", unite, 150.0));
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if let Some(e) = failed {
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return Err(e);
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}
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let mut over = 0;
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println!(" {:<40} {:>10} {:>10}", "", "measured", "budget");
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for (name, ms, budget) in &rows {
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let ok = ms <= budget;
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over += usize::from(!ok);
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println!(" {name:<40} {ms:>8.2} ms {budget:>7.0} ms {}", if ok { "ok" } else { "OVER" });
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}
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match (over, noisy) {
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(0, _) => Ok(()),
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(_, true) => {
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println!("{over} over budget, but the machine is busy: re-run when idle.");
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Ok(())
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}
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_ => Err(format!("{over} budget(s) exceeded")),
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}
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}
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