Alvin Alvin - 3 months ago 39x
Node.js Question

iisnode performace is very slow

I found out that iisnode is slow compare to use node command.

There are many benefits of using iisnode, but the performance is bad.

I am using the configuration file from here.

Any idea how to speed it up?


I notice each page call will reconnect a new mongodb connection.

How can I prevent it?


Here is a hint to integrate Node.js with IIS7 on a Windows 64-bit Server. The following hint also solves some poor performance issues with iisnode and demonstrates how to use Node.js Native Extensions as well.


Create a new Unmanaged Integrated 32-bit Application Pool dedicated for node.js. No other applications should use this pool.

This works for 64-bit as well but some node.js Native Extensions such as Coconut2D require 32-bit because of SQLite wrapping. If you are not using Native Extensions then you can go 64-bit all the way!

  1. Download: iisnode-core-iis7-v0.1.19.0-x64.msi.

  2. Install it using this command: msiexec /i iisnode-core-iis7-v0.1.19.0-x64.msi WOW=1. This will install the 32-bit version of iisnode on a 64-bit machine. Note that iisnode.dll will be installed in C:\Program Files (x86)\iisnode\iisnode.dll.

  3. Download the 32-bit version of node.js (eg. node-v0.12.0-x86.msi) and install it in C:\nodejs

  4. Create a new Application Pool

    Name: node.js
    Managed pipeline mode: Integrated 
    .NET Framework Version: No Managed Code
    Enable 32-Bit Applications: True
    Identity: administrator
  5. Assuming your Node.js Server Script file is server.js. Go the the web folder and create file node_start.cmd. In the command file you should change the current path to your wwwroot and start node.js with your server.js file. You should use double quoted paths.

    cd "C:\HostingSpaces\...\wwwroot"
    "C:\nodejs\node.exe" "C:\HostingSpaces\...\wwwroot\server.js"
  6. In your server.js make sure you have process.env.PORT

    var http = require('http');
    http.createServer(function (req, res) {
        ... your code here ...
  7. (Optional) If you are using any node.js Native Extensions such as Coconut2D, SQLite, Cairo or WebKit modules, you must copy the *.node files and DLLs in your wwwroot\node_modules folder. Make sure you also set NTFS security to allow execution of those files or elevate the Application Pool to impersonate the Administrator. To load the native extensions use require() as shown below.

    var http = require('http');
    var Coconut2D = require("Coconut2D.node");
    http.createServer(function (req, res) {
        ... your code here ...
  8. Place the following web.config in your web root (eg. C:\HostingSpaces\...\wwwroot). This will enable IIS7 to process any non-node files such as images, static html files and xml files, and let node.js handle only its own server-side scripts.

    Having IIS handling static files and running server-side scripts on node.js side-by-side is a highly recommended practice and really boosts the performance of your web sites.

    In this example I am handling .asp files with iisnode by using a Rewrite Rule. Replace *.asp* with your node.js server script extension (eg. *.njs*). Note that there is not a root slash in the wildcard pattern; this is important as well as the last * at the end of the pattern.

<?xml version="1.0" encoding="utf-8"?>
      <add name="iisnode" path="node.js" verb="*" modules="iisnode" />
    <iisnode nodeProcessCommandLine="&quot;C:\...\start_node.cmd&quot;" />
        <remove value="index.php" />
        <remove value="default.aspx" />
        <remove value="iisstart.htm" />
        <remove value="index.html" />
        <remove value="index.htm" />
        <remove value="Default.htm" />
        <remove name="X-Powered-By" />
        <rule name="CavoBoutique" patternSyntax="Wildcard">
          <match url="*.asp*" />
          <action type="Rewrite" url="node.js" logRewrittenUrl="true" />