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//! Benchmarks for registering timers.
use async_io::Timer;
use criterion::{black_box, criterion_group, criterion_main, Criterion};
use futures_lite::future;
use std::time::Duration;
/// Create a new `Timer` and poll it once to register it into the timer wheel.
fn make_timer() -> Timer {
let mut timer = Timer::after(Duration::from_secs(1));
future::block_on(future::poll_once(&mut timer));
timer
}
/// Benchmark the time it takes to register and deregister a timer.
fn register_timer(c: &mut Criterion) {
let mut group = c.benchmark_group("register_timer");
for prev_timer_count in [0, 1_000_000] {
// Add timers to the timer wheel.
let mut timers = Vec::new();
for _ in 0..prev_timer_count {
timers.push(make_timer());
}
// Benchmark registering a timer.
group.bench_function(
format!("register_timer.({} previous timers)", prev_timer_count),
|b| {
b.iter(|| {
let timer = make_timer();
black_box(timer);
});
},
);
}
}
criterion_group!(benches, register_timer);
criterion_main!(benches);
|
