Measure event loop lag
npm install event-loop-lag#event-loop-lag
Measures Node.js event loop lag.
``js
var interval = 1000; // how often to refresh our measurement
var lag = require('event-loop-lag')(interval);
console.log('event loop lag is %d', lag());
`
#### event-loop-lag(number)
event-loop-lag accepts a number of milliseconds representing how
often to refresh the event loop lag measurement and returns a function
you can call to receive the latest lag measurement in milliseconds.
`js
var lag = require('event-loop-lag')(1000);
var koa = require('koa');
var app = koa();
app.use(function*(next){
if ('/lag' == this.url)
this.body = lag() + ' milliseconds';
else
yield next;
})
`
`
npm install event-loop-lag --save
#### running tests
- make test runs testsmake test-cov
- runs tests + test coveragemake open-cov
- opens test coverage results in your browser
#### verbose logging
event-loop-lag supports the debug module for help during development.DEBUG
Enable verbose logging by setting your env variable like so:
`
DEBUG=event-loop-lag* npm test