Add the standalone benchmark client

benchmark/client/main.go

@@ -0,0 +1,72 @@
+package main
+
+import (
+	"flag"
+	"math"
+	"sync"
+	"time"
+
+	"fmt"
+	
+	"google.golang.org/grpc/benchmark"
+	"google.golang.org/grpc/benchmark/stats"
+	testpb "google.golang.org/grpc/interop/grpc_testing"
+)
+
+var (
+	server = flag.String("server", "", "The server address")
+	maxConcurrentRPCs = flag.Int("max_concurrent_rpcs", 1, "The max number of concurrent RPCs")
+	duration = flag.Int("duration", math.MaxInt32, "The duration in seconds to run the benchmark client")
+)
+
+func caller(client testpb.TestServiceClient) {
+	benchmark.DoUnaryCall(client, 1, 1)
+}
+
+func closeLoop() {
+	s := stats.NewStats(256)
+	conn := benchmark.NewClientConn(*server)
+	tc := testpb.NewTestServiceClient(conn)
+	// Warm up connection.
+	for i := 0; i < 100; i++ {
+		caller(tc)
+	}
+	ch := make(chan int, *maxConcurrentRPCs*4)
+	var wg sync.WaitGroup
+	wg.Add(*maxConcurrentRPCs)
+
+	// Distribute RPCs over maxConcurrentCalls workers.
+	for i := 0; i < *maxConcurrentRPCs; i++ {
+		go func() {
+			for _ = range ch {
+				caller(tc)
+			}
+			wg.Done()
+		}()
+	}
+	// Stop the client when time is up.
+	done := make(chan struct{})
+	go func() {
+		<-time.After(time.Duration(*duration) * time.Second)
+		close(done)
+	}()
+	ok := true
+	for ok {
+		start := time.Now()
+		select {
+		case ch <-0:
+			s.Add(time.Since(start))
+		case <-done:
+			ok = false
+		}
+	}
+	close(ch)
+	wg.Wait()
+	conn.Close()
+	fmt.Println(s.String())
+}
+
+func main() {
+	flag.Parse()
+	closeLoop()
+}