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use std::hint::black_box;
use std::time::{Duration, Instant};
use ratatui::layout::{Direction, Rect};
use crate::app::{App, AppPolicy};
use crate::client::{ClientShellConfig, ClientShellState};
use crate::config::Config;
use crate::kitty_graphics::HostCellSize;
use crate::protocol::PaneSurfaceFrame;
use crate::terminal::TerminalRuntime;
use crate::workspace::Workspace;
const COLS: u16 = 120;
const ROWS: u16 = 40;
const SAMPLE_COUNT: usize = 40;
const WARMUP_COUNT: usize = 5;
const CARDINALITIES: [usize; 3] = [1, 15, 50];
#[derive(Clone, Copy)]
struct StageStats {
median_us: u128,
p95_us: u128,
max_us: u128,
}
struct PipelineStats {
server: StageStats,
client: StageStats,
total: StageStats,
}
struct RenderPipeline {
app: App,
client: ClientShellState,
graphics_delivery: crate::kitty_graphics::surface::DeliveryCache,
}
impl RenderPipeline {
fn new(workspaces: Vec<Workspace>) -> Self {
let config = Config::default();
let (_api_tx, api_rx) = tokio::sync::mpsc::unbounded_channel();
let mut app = App::new(
&config,
AppPolicy::TEST,
None,
api_rx,
crate::api::EventHub::default(),
);
app.state.workspaces = workspaces;
app.state.active = Some(0);
app.state.selected = 0;
app.state.pane_scrollbars = true;
let mut client = ClientShellState::new(ClientShellConfig::from_config(&config));
client.set_snapshot(Box::new(super::client_shell::snapshot(
&app,
"bench-boot",
1,
None,
)));
Self {
app,
client,
graphics_delivery: crate::kitty_graphics::surface::DeliveryCache::default(),
}
}
fn render_once(&mut self) -> (Duration, Duration) {
let surface_size = self.client.surface_size(COLS, ROWS);
let started = Instant::now();
let rendered = super::client_shell::render_pane_surface(
&mut self.app,
Rect::new(0, 0, surface_size.cols, surface_size.rows),
true,
HostCellSize {
width_px: 1,
height_px: 1,
},
&self.graphics_delivery,
1,
);
let server_elapsed = started.elapsed();
self.graphics_delivery = rendered.graphics_delivery;
let started = Instant::now();
self.client.set_pane_surface(PaneSurfaceFrame {
boot_id: "bench-boot".into(),
projection_revision: 1,
surface_revision: 0,
frame: rendered.frame,
panes: rendered.panes,
splits: rendered.splits,
popup: rendered.popup,
graphics: rendered.graphics,
});
black_box(
self.client
.compose(COLS, ROWS)
.expect("benchmark pipeline should compose a complete frame"),
);
let client_elapsed = started.elapsed();
(server_elapsed, client_elapsed)
}
}
fn history() -> String {
(0..2_000).map(|line| format!("line-{line}\r\n")).collect()
}
fn runtime(history: &str) -> TerminalRuntime {
TerminalRuntime::test_with_scrollback_bytes(COLS, ROWS, 1024 * 1024, history.as_bytes())
}
fn workspaces(workspace_count: usize) -> Vec<Workspace> {
let history = history();
(0..workspace_count)
.map(|index| {
let mut workspace = Workspace::test_new(&format!("bench-{}", index + 1));
let root_pane = workspace.tabs[0].root_pane;
workspace.insert_test_runtime(root_pane, runtime(&history));
workspace
})
.collect()
}
fn active_panes(pane_count: usize) -> Vec<Workspace> {
let history = history();
let mut workspace = Workspace::test_new("bench");
let root_pane = workspace.tabs[0].root_pane;
workspace.insert_test_runtime(root_pane, runtime(&history));
let mut pane_ids = vec![root_pane];
for index in 1..pane_count {
let target = pane_ids[(index - 1) / 2];
workspace.tabs[0].layout.focus_pane(target);
let direction = if index % 2 == 0 {
Direction::Vertical
} else {
Direction::Horizontal
};
let pane_id = workspace.test_split(direction);
workspace.insert_test_runtime(pane_id, runtime(&history));
pane_ids.push(pane_id);
}
vec![workspace]
}
fn summarize(mut samples: Vec<Duration>) -> StageStats {
samples.sort_unstable();
StageStats {
median_us: samples[SAMPLE_COUNT / 2].as_micros(),
p95_us: samples[(SAMPLE_COUNT - 1) * 95 / 100].as_micros(),
max_us: samples[SAMPLE_COUNT - 1].as_micros(),
}
}
fn profile(build: fn(usize) -> Vec<Workspace>, count: usize) -> PipelineStats {
let mut pipeline = RenderPipeline::new(build(count));
for _ in 0..WARMUP_COUNT {
black_box(pipeline.render_once());
}
let mut server = Vec::with_capacity(SAMPLE_COUNT);
let mut client = Vec::with_capacity(SAMPLE_COUNT);
let mut total = Vec::with_capacity(SAMPLE_COUNT);
for _ in 0..SAMPLE_COUNT {
let (server_elapsed, client_elapsed) = pipeline.render_once();
server.push(server_elapsed);
client.push(client_elapsed);
total.push(server_elapsed + client_elapsed);
}
PipelineStats {
server: summarize(server),
client: summarize(client),
total: summarize(total),
}
}
fn print_stage(
label: &str,
rows: &[(usize, PipelineStats)],
stage: fn(&PipelineStats) -> StageStats,
) {
let baseline = stage(&rows[0].1);
println!(" {label}");
println!(" count median_us p95_us max_us median_vs_1x p95_vs_1x");
for (count, pipeline) in rows {
let stats = stage(pipeline);
println!(
" {count:>10} {:>9} {:>6} {:>6} {:>12.2} {:>9.2}",
stats.median_us,
stats.p95_us,
stats.max_us,
stats.median_us as f64 / baseline.median_us.max(1) as f64,
stats.p95_us as f64 / baseline.p95_us.max(1) as f64,
);
}
}
fn print_profiles(label: &str, build: fn(usize) -> Vec<Workspace>) {
let rows = CARDINALITIES.map(|count| (count, profile(build, count)));
println!("{label}");
print_stage("server pane surface", &rows, |stats| stats.server);
print_stage("client shell composition", &rows, |stats| stats.client);
print_stage("combined pipeline", &rows, |stats| stats.total);
}
#[tokio::test(flavor = "current_thread")]
#[ignore = "manual client-rendered pipeline scaling profile"]
async fn render_scale_profile() {
print_profiles("background workspaces (one pane each)", workspaces);
print_profiles("active panes (one workspace)", active_panes);
}
|
