add fastdns resolver benchmark

client_test.go

@@ -6,7 +6,9 @@ import (
 	"net/http"
 	"net/netip"
 	"net/url"
+	"os"
 	"reflect"
+	"regexp"
 	"testing"
 	"time"
 	"unsafe"
@@ -147,3 +149,52 @@ func TestClientLookup(t *testing.T) {
 		}
 	}
 }
+
+func BenchmarkResolverPureGo(b *testing.B) {
+	resolver := net.Resolver{PreferGo: true}
+
+	b.ReportAllocs()
+	b.ResetTimer()
+	b.RunParallel(func(b *testing.PB) {
+		for b.Next() {
+			_, _ = resolver.LookupNetIP(context.Background(), "ip4", "www.google.com")
+		}
+	})
+}
+
+func BenchmarkResolverCGO(b *testing.B) {
+	resolver := net.Resolver{PreferGo: false}
+
+	b.ReportAllocs()
+	b.ResetTimer()
+	b.RunParallel(func(b *testing.PB) {
+		for b.Next() {
+			_, _ = resolver.LookupNetIP(context.Background(), "ip4", "www.google.com")
+		}
+	})
+}
+
+func BenchmarkResolverFastdns(b *testing.B) {
+	server := "1.1.1.1:53"
+	if data, err := os.ReadFile("/etc/resolv.conf"); err == nil {
+		if m := regexp.MustCompile(`(^|\n)\s*nameserver\s+(\S+)`).FindAllStringSubmatch(string(data), -1); len(m) != 0 {
+			server = m[0][2]
+		}
+	}
+
+	resolver := Client{
+		Addr: server,
+		Dialer: &UDPDialer{
+			Addr:     func() (u *net.UDPAddr) { u, _ = net.ResolveUDPAddr("udp", server); return }(),
+			MaxConns: 1000,
+		},
+	}
+
+	b.ReportAllocs()
+	b.ResetTimer()
+	b.RunParallel(func(b *testing.PB) {
+		for b.Next() {
+			_, _ = resolver.LookupNetIP(context.Background(), "ip4", "www.google.com")
+		}
+	})
+}