Our next troubleshooting method is going to be CPU profiling. This will let us know what functions are the most CPU intensive. For this, we will use
webkit-devtools-agent. The setup for this tool is a little more difficult than the last.
The first thing we need to do is add a reference to the module. Open up
app.js and add this line to the top, as highlighted in the following code:
var agent = require('webkit-devtools-agent'); var express = require('express'); var app = express();
Technically, this is all we need to add to our code. If this was a production codebase, we could check whether we were in development or not and load this module. We can start the node at this time.
The next step is to send a USR2 signal to ...