Add profiling port for benchmark server

benchmark/client/main.go

@@ -2,7 +2,6 @@ package main
 
 import (
 	"flag"
-	"fmt"
 	"log"
 	"math"
 	"net"
@@ -71,7 +70,7 @@ func closeLoop() {
 	close(ch)
 	wg.Wait()
 	conn.Close()
-	fmt.Println(s.String())
+	log.Println(s.String())
 }
 
 func main() {

benchmark/server/main.go

@@ -2,8 +2,11 @@ package main
 
 import (
 	"flag"
-	"fmt"
+	"log"
 	"math"
+	"net"
+	"net/http"
+	_ "net/http/pprof"
 	"time"
 
 	"google.golang.org/grpc/benchmark"
@@ -15,8 +18,18 @@ var (
 
 func main() {
 	flag.Parse()
+	go func() {
+		lis, err := net.Listen("tcp", ":0")
+		if err != nil {
+			log.Fatalf("Failed to listen: %v", err)
+		}
+		log.Println("Server profiling address: ", lis.Addr().String())
+		if err := http.Serve(lis, nil); err != nil {
+			log.Fatalf("Failed to serve: %v", err)
+		}
+	}()
 	addr, stopper := benchmark.StartServer()
-	fmt.Println("Server Address: ", addr)
+	log.Println("Server Address: ", addr)
 	<-time.After(time.Duration(*duration) * time.Second)
 	stopper()
 }