add a benchmark allocation test for opening / accepting streams

integrationtests/self/benchmark_test.go

@@ -2,6 +2,7 @@ package self_test
 
 import (
 	"context"
+	"fmt"
 	"net"
 	"testing"
 
@@ -43,3 +44,49 @@ func BenchmarkHandshake(b *testing.B) {
 		c.CloseWithError(0, "")
 	}
 }
+
+func BenchmarkStreamChurn(b *testing.B) {
+	b.ReportAllocs()
+
+	ln, err := quic.ListenAddr("localhost:0", tlsConfig, &quic.Config{MaxIncomingStreams: 1e10})
+	if err != nil {
+		b.Fatal(err)
+	}
+	defer ln.Close()
+
+	errChan := make(chan error, 1)
+	go func() {
+		conn, err := ln.Accept(context.Background())
+		if err != nil {
+			errChan <- err
+			return
+		}
+		close(errChan)
+		for {
+			str, err := conn.AcceptStream(context.Background())
+			if err != nil {
+				return
+			}
+			str.Close()
+		}
+	}()
+
+	c, err := quic.DialAddr(fmt.Sprintf("localhost:%d", ln.Addr().(*net.UDPAddr).Port), tlsClientConfig, nil)
+	if err != nil {
+		b.Fatal(err)
+	}
+	if err := <-errChan; err != nil {
+		b.Fatal(err)
+	}
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		str, err := c.OpenStreamSync(context.Background())
+		if err != nil {
+			b.Fatal(err)
+		}
+		if err := str.Close(); err != nil {
+			b.Fatal(err)
+		}
+	}
+}