diff --git a/main.go b/main.go
index a33496f..6a8e7a3 100644
--- a/main.go
+++ b/main.go
@@ -17,6 +17,8 @@ func main() {
 	s := server.New()
 
 	grpcPool, err := backend.NewPool(backend.Options{
+		InitCapacity: 2,
+		MaxCapacity:  4,
 		Dial: func() (*grpc.ClientConn, error) {
 			return grpc.Dial("192.168.1.101:50006", grpc.WithInsecure())
 		},
diff --git a/module/member/signin.go b/module/member/signin.go
index 8ad33bf..69b93f3 100644
--- a/module/member/signin.go
+++ b/module/member/signin.go
@@ -12,12 +12,15 @@ import (
 
 func SignIn(sctx *server.ServerContext, ctx *fasthttp.RequestCtx) {
 	grpcPool := sctx.Value("grpc").(backend.Pool)
+	fmt.Fprintf(ctx, "avail: %d\n", grpcPool.Available())
 	c, err := grpcPool.Get()
 	if nil != err {
 
 	}
 	defer c.Close()
 
+	fmt.Fprintf(ctx, "avail: %d\n", grpcPool.Available())
+
 	signinId := string(ctx.FormValue("signinId"))
 	signinPw := string(ctx.FormValue("signinPw"))