使用MMAP提升缓存读取性能

internal/utils/mem/system.go

@@ -4,11 +4,14 @@ package memutils
 
 import (
 	teaconst "github.com/TeaOSLab/EdgeNode/internal/const"
+	"github.com/TeaOSLab/EdgeNode/internal/goman"
 	"github.com/shirou/gopsutil/v3/mem"
+	"time"
 )
 
 var systemTotalMemory = -1
 var systemMemoryBytes uint64
+var availableMemoryGB int
 
 func init() {
 	if !teaconst.IsMain {
@@ -16,6 +19,16 @@ func init() {
 	}
 
 	_ = SystemMemoryGB()
+
+	goman.New(func() {
+		var ticker = time.NewTicker(10 * time.Second)
+		for range ticker.C {
+			stat, err := mem.VirtualMemory()
+			if err == nil {
+				availableMemoryGB = int(stat.Available >> 30)
+			}
+		}
+	})
 }
 
 // SystemMemoryGB 系统内存GB数量
@@ -32,7 +45,8 @@ func SystemMemoryGB() int {
 
 	systemMemoryBytes = stat.Total
 
-	systemTotalMemory = int(stat.Total / (1 << 30))
+	availableMemoryGB = int(stat.Available >> 30)
+	systemTotalMemory = int(stat.Total >> 30)
 	if systemTotalMemory <= 0 {
 		systemTotalMemory = 1
 	}
@@ -46,3 +60,8 @@ func SystemMemoryGB() int {
 func SystemMemoryBytes() uint64 {
 	return systemMemoryBytes
 }
+
+// AvailableMemoryGB 获取当下可用内存GB数
+func AvailableMemoryGB() int {
+	return availableMemoryGB
+}