diff --git a/ants.go b/ants.go
index af76b67..2f27f3b 100644
--- a/ants.go
+++ b/ants.go
@@ -22,11 +22,14 @@
 
 package ants
 
-import "errors"
+import (
+	"errors"
+	"math"
+)
 
 const (
 	// DefaultPoolSize is the default capacity for a default goroutine pool
-	DefaultPoolSize = 50000
+	DefaultPoolSize = math.MaxInt32
 
 	// DefaultCleanIntervalTime is the interval time to clean up goroutines
 	DefaultCleanIntervalTime = 30
diff --git a/ants_benchmark_test.go b/ants_benchmark_test.go
index 0358dfc..188a926 100644
--- a/ants_benchmark_test.go
+++ b/ants_benchmark_test.go
@@ -36,7 +36,7 @@ func BenchmarkGoroutine(b *testing.B) {
 		for j := 0; j < RunTimes; j++ {
 			wg.Add(1)
 			go func() {
-				forSleep()
+				demoFunc()
 				wg.Done()
 			}()
 		}
@@ -50,7 +50,7 @@ func BenchmarkPoolGoroutine(b *testing.B) {
 		for j := 0; j < RunTimes; j++ {
 			wg.Add(1)
 			ants.Push(func() {
-				forSleep()
+				demoFunc()
 				wg.Done()
 			})
 		}
diff --git a/ants_test.go b/ants_test.go
index d1020ab..ff05806 100644
--- a/ants_test.go
+++ b/ants_test.go
@@ -27,10 +27,9 @@ import (
 	"runtime"
 	"sync"
 	"testing"
-	"time"
 )
 
-var n = 1000000
+var n = 10000000
 
 //func demoFunc() {
 //	var n int
@@ -47,25 +46,12 @@ var n = 1000000
 //	fmt.Printf("finish task with result:%d\n", n)
 //}
 
-func forSleep() {
-	time.Sleep(time.Millisecond)
-}
-
-func TestNoPool(t *testing.T) {
-	var wg sync.WaitGroup
-	for i := 0; i < n; i++ {
-		wg.Add(1)
-		go func() {
-			forSleep()
-			//demoFunc()
-			wg.Done()
-		}()
+func demoFunc() {
+	//time.Sleep(time.Millisecond)
+	var n int
+	for i := 0; i < 1000000; i++ {
+		n += i
 	}
-
-	wg.Wait()
-	mem := runtime.MemStats{}
-	runtime.ReadMemStats(&mem)
-	t.Logf("memory usage:%d", mem.TotalAlloc/1024)
 }
 
 func TestDefaultPool(t *testing.T) {
@@ -73,8 +59,7 @@ func TestDefaultPool(t *testing.T) {
 	for i := 0; i < n; i++ {
 		wg.Add(1)
 		ants.Push(func() {
-			forSleep()
-			//demoFunc()
+			demoFunc()
 			wg.Done()
 		})
 	}
@@ -89,24 +74,40 @@ func TestDefaultPool(t *testing.T) {
 	t.Logf("memory usage:%d", mem.TotalAlloc/1024)
 }
 
-func TestCustomPool(t *testing.T) {
-	p, _ := ants.NewPool(30000)
+func TestNoPool(t *testing.T) {
 	var wg sync.WaitGroup
 	for i := 0; i < n; i++ {
 		wg.Add(1)
-		p.Push(func() {
-			forSleep()
-			//demoFunc()
+		go func() {
+			demoFunc()
 			wg.Done()
-		})
+		}()
 	}
+
 	wg.Wait()
-
-	//t.Logf("pool capacity:%d", p.Cap())
-	//t.Logf("free workers number:%d", p.Free())
-
-	t.Logf("running workers number:%d", p.Running())
 	mem := runtime.MemStats{}
 	runtime.ReadMemStats(&mem)
 	t.Logf("memory usage:%d", mem.TotalAlloc/1024)
 }
+
+//func TestCustomPool(t *testing.T) {
+//	p, _ := ants.NewPool(30000)
+//	var wg sync.WaitGroup
+//	for i := 0; i < n; i++ {
+//		wg.Add(1)
+//		p.Push(func() {
+//			demoFunc()
+//			//demoFunc()
+//			wg.Done()
+//		})
+//	}
+//	wg.Wait()
+//
+//	//t.Logf("pool capacity:%d", p.Cap())
+//	//t.Logf("free workers number:%d", p.Free())
+//
+//	t.Logf("running workers number:%d", p.Running())
+//	mem := runtime.MemStats{}
+//	runtime.ReadMemStats(&mem)
+//	t.Logf("memory usage:%d", mem.TotalAlloc/1024)
+//}