Welcome to Mordor - Daniel Kahn - Codemotion Amsterdam 2016

Hunting Performance Problems in Node.jsCodeMotion Amsterdam 2016

Daniel Khan | @dkhan

Node.js is what the Company Outlaws

use to finally introduce change

Node.js is what the Company Hipsters threw in

just to break everything

Proactive Defense

Node.js is a C++ program controlled by V8 JavaScript

Hunting Memory Problems

process.memoryUsage(){ rss: 4935680, heapTotal: 1826816, heapUsed: 650472 }

How to build a Memory Leak

theThing

someMethod()

longStr

unused()

originalThing

Closure Context

Reference

Root

http://bit.ly/1PvijIy

var snap = profiler.takeSnapshot();snap.serialize();

v8-profiler

Delta

Hunting CPU Problems

calculateFibonacci();

http://bit.ly/1jQMbBR

profiler.startProfiling(id); profiler.stopProfiling(id);

v8-profiler

NODE_ENV=productionNODE_ENV=development

Blog: http://bit.ly/1flz0Xm

get(‘/routeA’, function(){})

get(‘/routeB’, function(){})

get(‘/routeC’, function(){})

get(‘/routeD’, function(){})

get(‘/routeE’, function(){})

get(‘/routeA’, function(){})

get(‘/routeX’, function(){})

get(‘/^(route|router)\/(.+)’, function(){})

HTTP GET /routeX

get(‘/routeA’, function(){})

get(‘/routeX’, function(){})

O(n)

Finding the route

1980 20001995 2005 2010 2015

Stakeholders

Browser Webserver Node Java Oracle

“No man is an island”or … We need a holistic view.

Meet Application Performance Monitoring

Takeaways• Node.js introduces change• Use dedicated tools like N|Solid to monitor Node.js specific metrics like CPU and Memory

Usage• Protect your boundaries by actively monitoring incoming and outgoing transactions• Use APM Solutions like Dynatrace or Ruxit to get a holistic view for all transactions passing

through all tiers of your stack

@dkhan

Daniel Khandaniel.khan@dynatrace.com

Node.js Technology Lead