update benchmarks and use throng on expressjs for better performance-- 21 Nov 2017 with linux ubuntu and latest mainline kernel 4.14

Former-commit-id: 40d27dd7d02f4ead756be090364075a6570ae2cb

_benchmarks/expressjs-throng-sessions/app.js

@@ -0,0 +1,33 @@
+process.env.NODE_ENV = 'production';
+
+const express = require('express');
+const app = express();
+const session = require('express-session');
+const createWorker = require('throng');
+const MemoryStore = require('session-memory-store')(session);
+
+createWorker(createWebServer)
+
+function createWebServer() {
+  // Use the session middleware with the memory-store as
+  // recommended for production local use, like with iris and netcore.
+  app.use(session({ store: new MemoryStore({expires: 1*60, checkperiod: 1*60}), secret: '.cookiesession.id', resave: true, saveUninitialized: false, cookie: { secure: true, maxAge: 60000 } }));
+  
+  app.get('/setget', function (req, res) {
+    req.session.key = 'value';
+
+    var value = req.session.key;
+    if (value == '') {
+      res.send('NOT_OK');
+      return;
+    }
+
+    res.send(value);
+  });
+
+  app.listen(5000, function () {
+    console.log(
+      'Now listening on: http://localhost:5000\nApplication started. Press CTRL+C to shut down.'
+    )
+  });
+}