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opentelemetry: improve performance by pre-determining attribute length (#1327)

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The `SpanBuilder` uses `Vec` to store span's fields. However, the
current solution can be slightly improved by preparing the capacity of
`Vec` in advance, this can reduce a few memory reallocations. 

Since the max number of tracing's span fields is 32, we can replace
`Vec` with `SmallVec` to further improve performance. Maybe, we should
add a new feature (such as `smallvec`?) to the `opentelemetry` crate.
Well, this should be discussed in the `opentelemetry` repo.

Co-authored-by: Eliza Weisman <eliza@buoyant.io>
This commit is contained in:
Folyd 2021-06-25 02:13:40 +08:00 committed by Eliza Weisman
parent ab6207621d
commit 29291af1fd
1 changed files with 16 additions and 29 deletions
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45
tracing-opentelemetry/src/layer.rs
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@ -177,29 +177,28 @@ impl<'a> field::Visit for SpanEventVisitor<'a> {
struct SpanAttributeVisitor<'a>(&'a mut otel::SpanBuilder);
impl<'a> SpanAttributeVisitor<'a> {
fn record(&mut self, attribute: KeyValue) {
debug_assert!(self.0.attributes.is_some());
if let Some(v) = self.0.attributes.as_mut() {
v.push(attribute);
}
}
}
impl<'a> field::Visit for SpanAttributeVisitor<'a> {
/// Set attributes on the underlying OpenTelemetry [`Span`] from `bool` values.
///
/// [`Span`]: opentelemetry::trace::Span
fn record_bool(&mut self, field: &field::Field, value: bool) {
let attribute = KeyValue::new(field.name(), value);
if let Some(attributes) = &mut self.0.attributes {
attributes.push(attribute);
} else {
self.0.attributes = Some(vec![attribute]);
}
self.record(KeyValue::new(field.name(), value));
}
/// Set attributes on the underlying OpenTelemetry [`Span`] from `i64` values.
///
/// [`Span`]: opentelemetry::trace::Span
fn record_i64(&mut self, field: &field::Field, value: i64) {
let attribute = KeyValue::new(field.name(), value);
if let Some(attributes) = &mut self.0.attributes {
attributes.push(attribute);
} else {
self.0.attributes = Some(vec![attribute]);
}
self.record(KeyValue::new(field.name(), value));
}
/// Set attributes on the underlying OpenTelemetry [`Span`] from `&str` values.
@ -211,14 +210,7 @@ impl<'a> field::Visit for SpanAttributeVisitor<'a> {
SPAN_KIND_FIELD => self.0.span_kind = str_to_span_kind(value),
SPAN_STATUS_CODE_FIELD => self.0.status_code = str_to_status_code(value),
SPAN_STATUS_MESSAGE_FIELD => self.0.status_message = Some(value.to_owned().into()),
_ => {
let attribute = KeyValue::new(field.name(), value.to_string());
if let Some(attributes) = &mut self.0.attributes {
attributes.push(attribute);
} else {
self.0.attributes = Some(vec![attribute]);
}
}
_ => self.record(KeyValue::new(field.name(), value.to_string())),
}
}
@ -236,14 +228,7 @@ impl<'a> field::Visit for SpanAttributeVisitor<'a> {
SPAN_STATUS_MESSAGE_FIELD => {
self.0.status_message = Some(format!("{:?}", value).into())
}
_ => {
let attribute = Key::new(field.name()).string(format!("{:?}", value));
if let Some(attributes) = &mut self.0.attributes {
attributes.push(attribute);
} else {
self.0.attributes = Some(vec![attribute]);
}
}
_ => self.record(Key::new(field.name()).string(format!("{:?}", value))),
}
}
}
@ -421,7 +406,9 @@ where
builder.trace_id = Some(self.tracer.new_trace_id());
}
let builder_attrs = builder.attributes.get_or_insert(Vec::new());
let builder_attrs = builder
.attributes
.get_or_insert(Vec::with_capacity(attrs.fields().len() + 3));
let meta = attrs.metadata();