1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
use std::fmt::Write;
use criterion::{black_box, criterion_group, criterion_main, Criterion};
use tracing::Level;
use tracing::{span, Event, Id, Metadata};
/// A subscriber that is enabled but otherwise does nothing.
struct EnabledSubscriber;
impl tracing::Subscriber for EnabledSubscriber {
fn new_span(&self, span: &span::Attributes<'_>) -> Id {
let _ = span;
Id::from_u64(0xDEAD_FACE)
}
fn event(&self, event: &Event<'_>) {
let _ = event;
}
fn record(&self, span: &Id, values: &span::Record<'_>) {
let _ = (span, values);
}
fn record_follows_from(&self, span: &Id, follows: &Id) {
let _ = (span, follows);
}
fn enabled(&self, metadata: &Metadata<'_>) -> bool {
let _ = metadata;
true
}
fn enter(&self, span: &Id) {
let _ = span;
}
fn exit(&self, span: &Id) {
let _ = span;
}
}
const NOP_LOGGER: NopLogger = NopLogger;
struct NopLogger;
impl log::Log for NopLogger {
fn enabled(&self, _metadata: &log::Metadata) -> bool {
true
}
fn log(&self, record: &log::Record) {
if self.enabled(record.metadata()) {
let mut this = self;
let _ = write!(this, "{}", record.args());
}
}
fn flush(&self) {}
}
impl Write for &NopLogger {
fn write_str(&mut self, s: &str) -> std::fmt::Result {
black_box(s);
Ok(())
}
}
const N_SPANS: usize = 100;
fn criterion_benchmark(c: &mut Criterion) {
let mut c = c.benchmark_group("global/subscriber");
let _ = tracing::subscriber::set_global_default(EnabledSubscriber);
let _ = log::set_logger(&NOP_LOGGER);
log::set_max_level(log::LevelFilter::Trace);
c.bench_function("span_no_fields", |b| b.iter(|| span!(Level::TRACE, "span")));
c.bench_function("event", |b| {
b.iter(|| {
tracing::event!(Level::TRACE, "hello");
})
});
c.bench_function("enter_span", |b| {
let span = span!(Level::TRACE, "span");
#[allow(clippy::unit_arg)]
b.iter(|| black_box(span.in_scope(|| {})))
});
c.bench_function("span_repeatedly", |b| {
#[inline]
fn mk_span(i: u64) -> tracing::Span {
span!(Level::TRACE, "span", i = i)
}
let n = black_box(N_SPANS);
b.iter(|| (0..n).fold(mk_span(0), |_, i| mk_span(i as u64)))
});
c.bench_function("span_with_fields", |b| {
b.iter(|| {
span!(
Level::TRACE,
"span",
foo = "foo",
bar = "bar",
baz = 3,
quuux = tracing::field::debug(0.99)
)
});
});
}
fn bench_dispatch(c: &mut Criterion) {
let mut group = c.benchmark_group("global/dispatch");
let _ = tracing::subscriber::set_global_default(EnabledSubscriber);
let _ = log::set_logger(&NOP_LOGGER);
log::set_max_level(log::LevelFilter::Trace);
group.bench_function("get_ref", |b| {
b.iter(|| {
tracing::dispatcher::get_default(|current| {
black_box(¤t);
})
})
});
group.bench_function("get_clone", |b| {
b.iter(|| {
let current = tracing::dispatcher::get_default(|current| current.clone());
black_box(current);
})
});
group.finish();
}
criterion_group!(benches, criterion_benchmark, bench_dispatch);
criterion_main!(benches);
|
