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use criterion::{black_box, criterion_group, criterion_main, Criterion};
mod shared;
fn bench(c: &mut Criterion) {
let mut group = c.benchmark_group("empty_span");
shared::for_all_dispatches(&mut group, |b| {
b.iter(|| {
let span = tracing::span::Span::none();
black_box(&span);
})
});
group.bench_function("baseline_struct", |b| {
b.iter(|| {
let span = FakeEmptySpan::new();
black_box(&span);
})
});
}
struct FakeEmptySpan {
inner: Option<(usize, std::sync::Arc<()>)>,
meta: Option<&'static ()>,
}
impl FakeEmptySpan {
fn new() -> Self {
Self {
inner: None,
meta: None,
}
}
}
impl Drop for FakeEmptySpan {
fn drop(&mut self) {
black_box(&self.inner);
black_box(&self.meta);
}
}
criterion_group!(benches, bench);
criterion_main!(benches);