introduce a samler fast path

DataDog · Dec 24, 2018 · 696d625 · 696d625
1 parent dce65e5
commit 696d625
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/ddtrace/tracer/sampler.go b/ddtrace/tracer/sampler.go
@@ -62,6 +62,10 @@ const knuthFactor = uint64(1111111111111111111)
 
 // Sample returns true if the given span should be sampled.
 func (r *rateSampler) Sample(spn ddtrace.Span) bool {
+	if r.rate == 1 {
+		// fast path
+		return true
+	}
 	s, ok := spn.(*span)
 	if !ok {
 		return false