diff --git a/examples/websocket_1m/server/server.go b/examples/websocket_1m/server/server.go
index d59bbe48..4990406c 100644
--- a/examples/websocket_1m/server/server.go
+++ b/examples/websocket_1m/server/server.go
@@ -56,7 +56,7 @@ func main() {
 		<-ticker.C
 		n := atomic.SwapUint64(&qps, 0)
 		total += n
-		_, _, _, _, s := mempool.State()
+		_, _, s := mempool.State()
 		fmt.Printf("running for %v seconds, NumGoroutine: %v, qps: %v, total: %v\n--------------------------------\n%v\n", i, runtime.NumGoroutine(), n, total, s)
 	}
 }
diff --git a/examples/websocket_1m_tls/server/server.go b/examples/websocket_1m_tls/server/server.go
index 755615b7..5912b05a 100644
--- a/examples/websocket_1m_tls/server/server.go
+++ b/examples/websocket_1m_tls/server/server.go
@@ -78,7 +78,7 @@ func main() {
 		<-ticker.C
 		n := atomic.SwapUint64(&qps, 0)
 		total += n
-		_, _, _, _, s := mempool.State()
+		_, _, s := mempool.State()
 		fmt.Printf("running for %v seconds, NumGoroutine: %v, qps: %v, total: %v\n--------------------------------\n%v\n", i, runtime.NumGoroutine(), n, total, s)
 	}
 }
diff --git a/examples/websocket_1m_tls/server_std/server.go b/examples/websocket_1m_tls/server_std/server.go
index 62fc5203..ec96e188 100644
--- a/examples/websocket_1m_tls/server_std/server.go
+++ b/examples/websocket_1m_tls/server_std/server.go
@@ -10,7 +10,6 @@ import (
 	"time"
 
 	"github.com/gorilla/websocket"
-	"github.com/lesismal/nbio/mempool"
 )
 
 var (
@@ -67,8 +66,7 @@ func main() {
 		<-ticker.C
 		n := atomic.SwapUint64(&qps, 0)
 		total += n
-		_, _, _, _, s := mempool.State()
-		fmt.Printf("running for %v seconds, NumGoroutine: %v, qps: %v, total: %v\n--------------------------------\n%v\n", i, runtime.NumGoroutine(), n, total, s)
+		fmt.Printf("running for %v seconds, NumGoroutine: %v, qps: %v, total: %v\n--------------------------------\n", i, runtime.NumGoroutine(), n, total)
 	}
 }