diff --git a/internal/ttlcache/cache.go b/internal/ttlcache/cache.go
index d36d83f..84a0d14 100644
--- a/internal/ttlcache/cache.go
+++ b/internal/ttlcache/cache.go
@@ -1,6 +1,7 @@
 package ttlcache
 
 import (
+	"github.com/TeaOSLab/EdgeNode/internal/utils"
 	"time"
 )
 
@@ -24,7 +25,7 @@ func NewCache(opt ...OptionInterface) *Cache {
 	var countPieces = 128
 	var maxItems = 2_000_000
 
-	var totalMemory = systemMemoryGB()
+	var totalMemory = utils.SystemMemoryGB()
 	if totalMemory < 2 {
 		// 我们限制内存过小的服务能够使用的数量
 		maxItems = 1_000_000
diff --git a/internal/ttlcache/system.go b/internal/utils/system.go
similarity index 81%
rename from internal/ttlcache/system.go
rename to internal/utils/system.go
index 8a943dc..f70c553 100644
--- a/internal/ttlcache/system.go
+++ b/internal/utils/system.go
@@ -1,6 +1,6 @@
 // Copyright 2021 Liuxiangchao iwind.liu@gmail.com. All rights reserved.
 
-package ttlcache
+package utils
 
 import (
 	"github.com/shirou/gopsutil/mem"
@@ -8,7 +8,11 @@ import (
 
 var systemTotalMemory = -1
 
-func systemMemoryGB() int {
+func init() {
+	_ = SystemMemoryGB()
+}
+
+func SystemMemoryGB() int {
 	if systemTotalMemory > 0 {
 		return systemTotalMemory
 	}
diff --git a/internal/ttlcache/system_test.go b/internal/utils/system_test.go
similarity index 59%
rename from internal/ttlcache/system_test.go
rename to internal/utils/system_test.go
index fd3fb8f..df15ca1 100644
--- a/internal/ttlcache/system_test.go
+++ b/internal/utils/system_test.go
@@ -1,11 +1,11 @@
 // Copyright 2021 Liuxiangchao iwind.liu@gmail.com. All rights reserved.
 
-package ttlcache
+package utils
 
 import "testing"
 
 func TestSystemMemoryGB(t *testing.T) {
-	t.Log(systemMemoryGB())
-	t.Log(systemMemoryGB())
-	t.Log(systemMemoryGB())
+	t.Log(SystemMemoryGB())
+	t.Log(SystemMemoryGB())
+	t.Log(SystemMemoryGB())
 }