1 files changed, 101 insertions, 0 deletions
diff --git a/vendor/tracing/benches/no_subscriber.rs b/vendor/tracing/benches/no_subscriber.rs
new file mode 100644
index 000000000..e0f82b56a
--- /dev/null
+++ b/vendor/tracing/benches/no_subscriber.rs
@@ -0,0 +1,101 @@
+use criterion::{black_box, criterion_group, criterion_main, Criterion};
+use tracing::Level;
+
+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);
+    }
+}
+
+fn bench_no_subscriber(c: &mut Criterion) {
+    use std::sync::atomic::{AtomicUsize, Ordering};
+
+    let mut group = c.benchmark_group("no_subscriber");
+
+    group.bench_function("span", |b| {
+        b.iter(|| {
+            let span = tracing::span!(Level::TRACE, "span");
+            black_box(&span);
+        })
+    });
+    group.bench_function("span_enter", |b| {
+        b.iter(|| {
+            let span = tracing::span!(Level::TRACE, "span");
+            let _e = span.enter();
+        })
+    });
+    group.bench_function("empty_span", |b| {
+        b.iter(|| {
+            let span = tracing::span::Span::none();
+            black_box(&span);
+        });
+    });
+    group.bench_function("empty_struct", |b| {
+        b.iter(|| {
+            let span = FakeEmptySpan::new();
+            black_box(&span);
+        })
+    });
+    group.bench_function("event", |b| {
+        b.iter(|| {
+            tracing::event!(Level::TRACE, "hello");
+        })
+    });
+    group.bench_function("relaxed_load", |b| {
+        let foo = AtomicUsize::new(1);
+        b.iter(|| black_box(foo.load(Ordering::Relaxed)));
+    });
+    group.bench_function("acquire_load", |b| {
+        let foo = AtomicUsize::new(1);
+        b.iter(|| black_box(foo.load(Ordering::Acquire)))
+    });
+    group.bench_function("log", |b| {
+        b.iter(|| {
+            log::log!(log::Level::Info, "log");
+        })
+    });
+    group.finish();
+}
+
+fn bench_fields(c: &mut Criterion) {
+    let mut group = c.benchmark_group("no_subscriber_field");
+    group.bench_function("span", |b| {
+        b.iter(|| {
+            black_box(tracing::span!(
+                Level::TRACE,
+                "span",
+                foo = tracing::field::display(format!("bar {:?}", 2))
+            ));
+        })
+    });
+    group.bench_function("event", |b| {
+        b.iter(|| {
+            tracing::event!(
+                Level::TRACE,
+                foo = tracing::field::display(format!("bar {:?}", 2))
+            );
+        })
+    });
+    group.bench_function("log", |b| {
+        b.iter(|| log::log!(log::Level::Trace, "{}", format!("bar {:?}", 2)))
+    });
+    group.finish();
+}
+
+criterion_group!(benches, bench_no_subscriber, bench_fields);
+criterion_main!(benches);