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//! Lightweight opt-in render profiling for local performance investigations.
use std::collections::BTreeMap;
use std::sync::{Mutex, OnceLock};
use std::time::{Duration, Instant};
const ENV_VAR: &str = "HERDR_RENDER_PROF";
static ENABLED: OnceLock<bool> = OnceLock::new();
static PROFILER: OnceLock<Mutex<RenderProfiler>> = OnceLock::new();
#[derive(Default)]
struct DurationStats {
count: u64,
total_ns: u128,
max_ns: u128,
}
struct RenderProfiler {
window_started: Instant,
counters: BTreeMap<&'static str, u64>,
durations: BTreeMap<&'static str, DurationStats>,
}
impl RenderProfiler {
fn new() -> Self {
Self {
window_started: Instant::now(),
counters: BTreeMap::new(),
durations: BTreeMap::new(),
}
}
fn increment(&mut self, name: &'static str, value: u64) {
*self.counters.entry(name).or_default() += value;
}
fn duration(&mut self, name: &'static str, duration: Duration) {
let stats = self.durations.entry(name).or_default();
let ns = duration.as_nanos();
stats.count += 1;
stats.total_ns += ns;
stats.max_ns = stats.max_ns.max(ns);
}
fn flush_if_due(&mut self) {
let elapsed = self.window_started.elapsed();
if elapsed < Duration::from_secs(1) {
return;
}
let counters = self
.counters
.iter()
.map(|(name, value)| format!("{name}={value}"))
.collect::<Vec<_>>()
.join(",");
let durations = self
.durations
.iter()
.map(|(name, stats)| {
let avg_us = if stats.count == 0 {
0
} else {
stats.total_ns / u128::from(stats.count) / 1_000
};
let max_us = stats.max_ns / 1_000;
format!(
"{name}=count:{} avg_us:{} max_us:{}",
stats.count, avg_us, max_us
)
})
.collect::<Vec<_>>()
.join(",");
tracing::info!(
event = "render.prof",
window_ms = elapsed.as_millis() as u64,
counters = %counters,
durations = %durations,
"render profiler window"
);
self.window_started = Instant::now();
self.counters.clear();
self.durations.clear();
}
}
pub(crate) fn enabled() -> bool {
*ENABLED.get_or_init(|| {
std::env::var(ENV_VAR)
.map(|value| matches!(value.as_str(), "1" | "true" | "yes" | "on"))
.unwrap_or(false)
})
}
fn with_profiler(update: impl FnOnce(&mut RenderProfiler)) {
if !enabled() {
return;
}
let profiler = PROFILER.get_or_init(|| Mutex::new(RenderProfiler::new()));
if let Ok(mut profiler) = profiler.lock() {
update(&mut profiler);
}
}
pub(crate) fn counter(name: &'static str, value: u64) {
if value == 0 {
return;
}
with_profiler(|profiler| profiler.increment(name, value));
}
pub(crate) fn event(name: &'static str) {
counter(name, 1);
}
pub(crate) fn duration(name: &'static str, duration: Duration) {
with_profiler(|profiler| profiler.duration(name, duration));
}
pub(crate) fn timer() -> Option<Instant> {
enabled().then(Instant::now)
}
pub(crate) fn duration_since(name: &'static str, started: Option<Instant>) {
if let Some(started) = started {
duration(name, started.elapsed());
}
}
pub(crate) fn flush_if_due() {
with_profiler(RenderProfiler::flush_if_due);
}
|
