add experimental to benchmark

benchmarks/Makefile

@@ -1,13 +1,26 @@
 
-all:
-	@./run 1 middleware
-	@./run 5 middleware
-	@./run 10 middleware
-	@./run 15 middleware
-	@./run 20 middleware
-	@./run 30 middleware
-	@./run 50 middleware
-	@./run 100 middleware
+all: middleware experimental
+
+middleware:
+	@./run 1 $@
+	@./run 5 $@
+	@./run 10 $@
+	@./run 15 $@
+	@./run 20 $@
+	@./run 30 $@
+	@./run 50 $@
+	@./run 100 $@
+	@echo
+
+experimental:
+	@./run 1 $@
+	@./run 5 $@
+	@./run 10 $@
+	@./run 15 $@
+	@./run 20 $@
+	@./run 30 $@
+	@./run 50 $@
+	@./run 100 $@
 	@echo
 
-.PHONY: all
+.PHONY: all middleware experimental

benchmarks/experimental/async.js

@@ -0,0 +1,26 @@
+
+var http = require('http');
+var koa = require('../..');
+var app = koa();
+
+app.experimental = true;
+
+// number of middleware
+
+var n = parseInt(process.env.MW || '1', 10);
+console.log('  %s async middleware', n);
+
+while (n--) {
+  app.use(async function (next){
+    await next;
+  });
+}
+
+var body = new Buffer('Hello World');
+
+app.use(async function (next){
+  await next;
+  this.body = body;
+});
+
+app.listen(3333);

benchmarks/experimental/index.js

@@ -0,0 +1,6 @@
+// support async await by babel
+require('babel/register')({
+  optional: ['asyncToGenerator']
+});
+
+require('./async');