diff --git a/ants_benchmark_test.go b/ants_benchmark_test.go
index 6485b61..f04d158 100644
--- a/ants_benchmark_test.go
+++ b/ants_benchmark_test.go
@@ -23,25 +23,75 @@
 package ants_test
 
 import (
+	"runtime"
 	"sync"
 	"testing"
+	"time"
 
 	"github.com/panjf2000/ants"
 )
 
-const RunTimes = 1000000
-const loop = 1000000
+const (
+	_   = 1 << (10 * iota)
+	KiB // 1024
+	MiB // 1048576
+	GiB // 1073741824
+	TiB // 1099511627776             (超过了int32的范围)
+	PiB // 1125899906842624
+	EiB // 1152921504606846976
+	ZiB // 1180591620717411303424    (超过了int64的范围)
+	YiB // 1208925819614629174706176
+)
+const RunTimes = 10000000
+const loop = 5
 
 func demoPoolFunc(args interface{}) error {
-	m := args.(int)
-	var n int
-	for i := 0; i < m; i++ {
-		n += i
-	}
+	// m := args.(int)
+	// var n int
+	// for i := 0; i < m; i++ {
+	// 	n += i
+	// }
+	// return nil
+	n := args.(int)
+	time.Sleep(time.Duration(n) * time.Millisecond)
 	return nil
 }
 
 func BenchmarkGoroutine(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		var wg sync.WaitGroup
+		for j := 0; j < RunTimes; j++ {
+			wg.Add(1)
+			go func() {
+				demoFunc()
+				wg.Done()
+			}()
+		}
+		wg.Wait()
+	}
+	mem := runtime.MemStats{}
+	runtime.ReadMemStats(&mem)
+	b.Logf("total memory usage:%d MB", mem.TotalAlloc/MiB)
+}
+
+func BenchmarkAntsPool(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		var wg sync.WaitGroup
+		for j := 0; j < RunTimes; j++ {
+			wg.Add(1)
+			ants.Push(func() {
+				demoFunc()
+				wg.Done()
+			})
+		}
+		wg.Wait()
+	}
+	mem := runtime.MemStats{}
+	runtime.ReadMemStats(&mem)
+	b.Logf("total memory usage:%d MB", mem.TotalAlloc/MiB)
+}
+
+func BenchmarkGoroutineWithFunc(b *testing.B) {
 	for i := 0; i < b.N; i++ {
 		var wg sync.WaitGroup
 		b.ResetTimer()
@@ -54,26 +104,15 @@ func BenchmarkGoroutine(b *testing.B) {
 		}
 		wg.Wait()
 	}
+	mem := runtime.MemStats{}
+	runtime.ReadMemStats(&mem)
+	b.Logf("total memory usage:%d MB", mem.TotalAlloc/MiB)
 }
 
-//func BenchmarkAntsPool(b *testing.B) {
-//	for i := 0; i < b.N; i++ {
-//		var wg sync.WaitGroup
-//		for j := 0; j < RunTimes; j++ {
-//			wg.Add(1)
-//			ants.Push(func() {
-//				demoFunc()
-//				wg.Done()
-//			})
-//		}
-//		wg.Wait()
-//	}
-//}
-
 func BenchmarkAntsPoolWithFunc(b *testing.B) {
 	for i := 0; i < b.N; i++ {
 		var wg sync.WaitGroup
-		p, _ := ants.NewPoolWithFunc(100000, func(i interface{}) error {
+		p, _ := ants.NewPoolWithFunc(50000, func(i interface{}) error {
 			demoPoolFunc(i)
 			wg.Done()
 			return nil
@@ -85,4 +124,7 @@ func BenchmarkAntsPoolWithFunc(b *testing.B) {
 		}
 		wg.Wait()
 	}
+	mem := runtime.MemStats{}
+	runtime.ReadMemStats(&mem)
+	b.Logf("total memory usage:%d MB", mem.TotalAlloc/MiB)
 }
diff --git a/ants_test.go b/ants_test.go
index 79a3a57..74c95e9 100644
--- a/ants_test.go
+++ b/ants_test.go
@@ -24,13 +24,14 @@ package ants_test
 
 import (
 	"runtime"
+	"time"
 	"sync"
 	"testing"
 
 	"github.com/panjf2000/ants"
 )
 
-var n = 100000
+var n = 10000000
 
 //func demoFunc() {
 //	var n int
@@ -48,48 +49,48 @@ var n = 100000
 //}
 
 func demoFunc() {
-	//time.Sleep(time.Millisecond)
-	var n int
-	for i := 0; i < 1000000; i++ {
-		n += i
-	}
+	time.Sleep(10 * time.Millisecond)
+	// var n int
+	// for i := 0; i < 1000000; i++ {
+	// 	n += i
+	// }
 }
 
-//func TestDefaultPool(t *testing.T) {
-//	var wg sync.WaitGroup
-//	for i := 0; i < n; i++ {
-//		wg.Add(1)
-//		ants.Push(func() {
-//			demoFunc()
-//			wg.Done()
-//		})
-//	}
-//	wg.Wait()
-//
-//	//t.Logf("pool capacity:%d", ants.Cap())
-//	//t.Logf("free workers number:%d", ants.Free())
-//
-//	t.Logf("running workers number:%d", ants.Running())
-//	mem := runtime.MemStats{}
-//	runtime.ReadMemStats(&mem)
-//	t.Logf("memory usage:%d", mem.TotalAlloc/1024)
-//}
+func TestDefaultPool(t *testing.T) {
+	var wg sync.WaitGroup
+	for i := 0; i < n; i++ {
+		wg.Add(1)
+		ants.Push(func() {
+			demoFunc()
+			wg.Done()
+		})
+	}
+	wg.Wait()
 
-//func TestNoPool(t *testing.T) {
-//	var wg sync.WaitGroup
-//	for i := 0; i < n; i++ {
-//		wg.Add(1)
-//		go func() {
-//			demoFunc()
-//			wg.Done()
-//		}()
-//	}
-//
-//	wg.Wait()
-//	mem := runtime.MemStats{}
-//	runtime.ReadMemStats(&mem)
-//	t.Logf("memory usage:%d", mem.TotalAlloc/1024)
-//}
+	//t.Logf("pool capacity:%d", ants.Cap())
+	//t.Logf("free workers number:%d", ants.Free())
+
+	t.Logf("running workers number:%d", ants.Running())
+	mem := runtime.MemStats{}
+	runtime.ReadMemStats(&mem)
+	t.Logf("memory usage:%d", mem.TotalAlloc/MiB)
+}
+
+func TestNoPool(t *testing.T) {
+	var wg sync.WaitGroup
+	for i := 0; i < n; i++ {
+		wg.Add(1)
+		go func() {
+			demoFunc()
+			wg.Done()
+		}()
+	}
+
+	wg.Wait()
+	mem := runtime.MemStats{}
+	runtime.ReadMemStats(&mem)
+	t.Logf("memory usage:%d", mem.TotalAlloc/MiB)
+}
 
 func TestAntsPoolWithFunc(t *testing.T) {
 	var wg sync.WaitGroup
@@ -110,24 +111,24 @@ func TestAntsPoolWithFunc(t *testing.T) {
 	t.Logf("running workers number:%d", p.Running())
 	mem := runtime.MemStats{}
 	runtime.ReadMemStats(&mem)
-	t.Logf("memory usage:%d", mem.TotalAlloc/1024)
+	t.Logf("memory usage:%d", mem.TotalAlloc/GiB)
 }
 
-func TestNoPool(t *testing.T) {
-	var wg sync.WaitGroup
-	for i := 0; i < n; i++ {
-		wg.Add(1)
-		go func() {
-			demoPoolFunc(n)
-			wg.Done()
-		}()
-	}
+// func TestNoPool(t *testing.T) {
+// 	var wg sync.WaitGroup
+// 	for i := 0; i < n; i++ {
+// 		wg.Add(1)
+// 		go func() {
+// 			demoPoolFunc(n)
+// 			wg.Done()
+// 		}()
+// 	}
 
-	wg.Wait()
-	mem := runtime.MemStats{}
-	runtime.ReadMemStats(&mem)
-	t.Logf("memory usage:%d", mem.TotalAlloc/1024)
-}
+// 	wg.Wait()
+// 	mem := runtime.MemStats{}
+// 	runtime.ReadMemStats(&mem)
+// 	t.Logf("memory usage:%d", mem.TotalAlloc/GiB)
+// }
 
 //func TestCustomPool(t *testing.T) {
 //	p, _ := ants.NewPool(30000)
diff --git a/examples/main.go b/examples/main.go
index cd8c2eb..9c5bb92 100644
--- a/examples/main.go
+++ b/examples/main.go
@@ -24,44 +24,50 @@ package main
 
 import (
 	"fmt"
-	"github.com/panjf2000/ants"
 	"sync"
+
+	"github.com/panjf2000/ants"
 )
 
-func myFunc() {
-	fmt.Println("Hello World!")
+var str = "Hello World!"
+
+func myFunc(i interface{}) error {
+	s := i.(string)
+	fmt.Println(s)
+	return nil
 }
 
+// func main() {
+// 	runTimes := 10000
+// 	var wg sync.WaitGroup
+// 	// submit all your tasks to ants pool
+// 	for i := 0; i < runTimes; i++ {
+// 		wg.Add(1)
+// 		ants.Push(func() {
+// 			myFunc()
+// 			wg.Done()
+// 		})
+// 	}
+// 	wg.Wait()
+// 	fmt.Println("finish all tasks!")
+// }
+
 func main() {
-	runTimes := 10000
+	runTimes := 1000
+
+	// set 100 the size of goroutine pool
+
 	var wg sync.WaitGroup
-	// submit all your tasks to ants pool
+	p, _ := ants.NewPoolWithFunc(100, func(i interface{}) error {
+		myFunc(i)
+		wg.Done()
+		return nil
+	})
+	// submit
 	for i := 0; i < runTimes; i++ {
 		wg.Add(1)
-		ants.Push(func() {
-			myFunc()
-			wg.Done()
-		})
+		p.Serve(str)
 	}
 	wg.Wait()
 	fmt.Println("finish all tasks!")
 }
-
-//func main() {
-//	runTimes := 10000
-//
-//	// set 100 the size of goroutine pool
-//	p, _ := ants.NewPool(100)
-//
-//	var wg sync.WaitGroup
-//	// submit
-//	for i := 0; i < runTimes; i++ {
-//		wg.Add(1)
-//		p.Push(func() {
-//			myFunc()
-//			wg.Done()
-//		})
-//	}
-//	wg.Wait()
-//	fmt.Println("finish all tasks!")
-//}
diff --git a/pool.go b/pool.go
index 58b2dd2..113027f 100644
--- a/pool.go
+++ b/pool.go
@@ -42,7 +42,7 @@ type Pool struct {
 	// running is the number of the currently running goroutines.
 	running int32
 
-	// signal is used to notice pool there are available
+	// freeSignal is used to notice pool there are available
 	// workers which can be sent to work.
 	freeSignal chan sig
 
diff --git a/pool_func.go b/pool_func.go
index 7223bfa..0e888e5 100644
--- a/pool_func.go
+++ b/pool_func.go
@@ -40,7 +40,7 @@ type PoolWithFunc struct {
 	// running is the number of the currently running goroutines.
 	running int32
 
-	// signal is used to notice pool there are available
+	// freeSignal is used to notice pool there are available
 	// workers which can be sent to work.
 	freeSignal chan sig