Added Benchmarks around events (#2405)

* Added Benchmarks around events

Also fixed the attribute benchmarks to reflect the # of attributes in the test

* Fix test txt, and too new a version of time

Co-authored-by: Tyler Yahn <MrAlias@users.noreply.github.com>

sdk/trace/benchmark_test.go

@@ -17,6 +17,7 @@ package trace_test
 import (
 	"context"
 	"testing"
+	"time"
 
 	"go.opentelemetry.io/otel/attribute"
 	sdktrace "go.opentelemetry.io/otel/sdk/trace"
@@ -44,6 +45,7 @@ func BenchmarkSpanWithAttributes_4(b *testing.B) {
 			span.SetAttributes(
 				attribute.Bool("key1", false),
 				attribute.String("key2", "hello"),
+				attribute.Int64("key3", 123),
 				attribute.Float64("key4", 123.456),
 			)
 			span.End()
@@ -61,9 +63,11 @@ func BenchmarkSpanWithAttributes_8(b *testing.B) {
 			span.SetAttributes(
 				attribute.Bool("key1", false),
 				attribute.String("key2", "hello"),
+				attribute.Int64("key3", 123),
 				attribute.Float64("key4", 123.456),
 				attribute.Bool("key21", false),
 				attribute.String("key22", "hello"),
+				attribute.Int64("key23", 123),
 				attribute.Float64("key24", 123.456),
 			)
 			span.End()
@@ -114,6 +118,67 @@ func BenchmarkSpanWithAttributes_all_2x(b *testing.B) {
 	})
 }
 
+func BenchmarkSpanWithEvents_4(b *testing.B) {
+	traceBenchmark(b, "Benchmark Start With 4 Events", func(b *testing.B, t trace.Tracer) {
+		ctx := context.Background()
+		b.ResetTimer()
+
+		for i := 0; i < b.N; i++ {
+			_, span := t.Start(ctx, "/foo")
+			span.AddEvent("event1")
+			span.AddEvent("event2")
+			span.AddEvent("event3")
+			span.AddEvent("event4")
+			span.End()
+		}
+	})
+}
+
+func BenchmarkSpanWithEvents_8(b *testing.B) {
+	traceBenchmark(b, "Benchmark Start With 4 Events", func(b *testing.B, t trace.Tracer) {
+		ctx := context.Background()
+		b.ResetTimer()
+
+		for i := 0; i < b.N; i++ {
+			_, span := t.Start(ctx, "/foo")
+			span.AddEvent("event1")
+			span.AddEvent("event2")
+			span.AddEvent("event3")
+			span.AddEvent("event4")
+			span.AddEvent("event5")
+			span.AddEvent("event6")
+			span.AddEvent("event7")
+			span.AddEvent("event8")
+			span.End()
+		}
+	})
+}
+
+func BenchmarkSpanWithEvents_WithStackTrace(b *testing.B) {
+	traceBenchmark(b, "Benchmark Start With 4 Attributes", func(b *testing.B, t trace.Tracer) {
+		ctx := context.Background()
+		b.ResetTimer()
+
+		for i := 0; i < b.N; i++ {
+			_, span := t.Start(ctx, "/foo")
+			span.AddEvent("event1", trace.WithStackTrace(true))
+			span.End()
+		}
+	})
+}
+func BenchmarkSpanWithEvents_WithTimestamp(b *testing.B) {
+	traceBenchmark(b, "Benchmark Start With 4 Attributes", func(b *testing.B, t trace.Tracer) {
+		ctx := context.Background()
+		b.ResetTimer()
+
+		for i := 0; i < b.N; i++ {
+			_, span := t.Start(ctx, "/foo")
+			span.AddEvent("event1", trace.WithTimestamp(time.Unix(0, 0)))
+			span.End()
+		}
+	})
+}
+
 func BenchmarkTraceID_DotString(b *testing.B) {
 	t, _ := trace.TraceIDFromHex("0000000000000001000000000000002a")
 	sc := trace.NewSpanContext(trace.SpanContextConfig{TraceID: t})