add benchmark test

ants_benchmark_test.go

@@ -1 +1,22 @@
-package ants
+package ants_test
+
+import (
+	"testing"
+	"github.com/panjf2000/ants"
+)
+
+var size = 1000
+
+func BenchmarkPoolGroutine(b *testing.B) {
+	p := ants.NewPool(size)
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		p.Push(demoFunc)
+	}
+}
+
+func BenchmarkGoroutine(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		go demoFunc()
+	}
+}

pool.go

@@ -3,7 +3,6 @@ package ants
 import (
 	"runtime"
 	"sync/atomic"
-	"math"
 	"sync"
 )
 
@@ -23,7 +22,7 @@ type Pool struct {
 func NewPool(size int) *Pool {
 	p := &Pool{
 		capacity: int32(size),
-		tasks:    make(chan f, math.MaxInt32),
+		tasks:    make(chan f, 1000),
 		//workers:  &sync.Pool{New: func() interface{} { return &Worker{} }},
 		workers: make(chan *Worker, size),
 		destroy: make(chan sig, runtime.GOMAXPROCS(-1)),