snapshot of https://github.com/grpc/grpc-go.git (master, 2026-09-15; blobs > 131072B omitted)

internal/transport/http2_client_header_bench_test.go

@@ -0,0 +1,96 @@
+/*
+ *
+ * Copyright 2026 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package transport
+
+import (
+	"context"
+	"fmt"
+	"testing"
+	"time"
+
+	"google.golang.org/grpc/metadata"
+)
+
+// BenchmarkCreateHeaderFields measures header-slice construction as the amount
+// of outgoing metadata varies.
+func BenchmarkCreateHeaderFields(b *testing.B) {
+	for _, mdCount := range []int{0, 4, 12} {
+		b.Run(fmt.Sprintf("mdCount=%d", mdCount), func(b *testing.B) {
+			t := &http2Client{
+				scheme:    "https",
+				userAgent: "grpc-go/benchmark",
+				md:        metadata.MD{},
+			}
+			ctx, cancel := context.WithTimeout(context.Background(), time.Hour)
+			defer cancel()
+			if mdCount > 0 {
+				md := make(metadata.MD, mdCount)
+				for i := 0; i < mdCount; i++ {
+					md[fmt.Sprintf("header-%d", i)] = []string{fmt.Sprintf("value-%d", i)}
+				}
+				ctx = metadata.NewOutgoingContext(ctx, md)
+			}
+			callHdr := &CallHdr{
+				Method: "/grpc.testing.BenchmarkService/UnaryCall",
+				Host:   "server:443",
+			}
+
+			b.ReportAllocs()
+			for b.Loop() {
+				hf, err := t.createHeaderFields(ctx, callHdr)
+				if err != nil {
+					b.Fatal(err)
+				}
+				if len(hf) == 0 {
+					b.Fatal("no header fields produced")
+				}
+			}
+		})
+
+		b.Run(fmt.Sprintf("mdCount=%d-appended", mdCount), func(b *testing.B) {
+			t := &http2Client{
+				scheme:    "https",
+				userAgent: "grpc-go/benchmark",
+				md:        metadata.MD{},
+			}
+			ctx, cancel := context.WithTimeout(context.Background(), time.Hour)
+			defer cancel()
+			kvs := make([]string, 0, mdCount*2)
+			for i := 0; i < mdCount; i++ {
+				kvs = append(kvs, fmt.Sprintf("header-%d", i), fmt.Sprintf("value-%d", i))
+			}
+			ctx = metadata.AppendToOutgoingContext(ctx, kvs...)
+			callHdr := &CallHdr{
+				Method: "/grpc.testing.BenchmarkService/UnaryCall",
+				Host:   "server:443",
+			}
+
+			b.ReportAllocs()
+			for b.Loop() {
+				hf, err := t.createHeaderFields(ctx, callHdr)
+				if err != nil {
+					b.Fatal(err)
+				}
+				if len(hf) == 0 {
+					b.Fatal("no header fields produced")
+				}
+			}
+		})
+	}
+}