Option for Socket Sharding as requested at #1544

Former-commit-id: 0384baf593012377a94344d647ca41121294285a

_examples/http-server/socket-sharding/main.go

@@ -0,0 +1,21 @@
+package main
+
+import (
+	"time"
+
+	"github.com/kataras/iris/v12"
+)
+
+func main() {
+	startup := time.Now()
+
+	app := iris.New()
+	app.Get("/", func(ctx iris.Context) {
+		s := startup.Format(ctx.Application().ConfigurationReadOnly().GetTimeFormat())
+		ctx.Writef("This server started at: %s\n", s)
+	})
+
+	// This option allows linear scaling server performance on multi-CPU servers.
+	// See https://www.nginx.com/blog/socket-sharding-nginx-release-1-9-1/ for details.
+	app.Listen(":8080", iris.WithSocketSharding)
+}