Presentation slam the server with jMeter

Nestor Mata Cuthbert nestor.mata@janeirodigital.com

Janeiro Digital

My dear earthlings

The Story ×  A sad non productive server

×  Can’t work with more than a couple clients

×  Sometimes even gets one client hanging for long time

×  We even raised his salary and still can’t make it

×  Because is not actually his fault…

Listen to the server ×  The server is not understood

×  What it does and how it does it?

×  Adjust the server as per the needs ×  The needs of the application ×  The needs of the users

The basics of any HTTP application

×  Requests

×  Threads

×  Memory

×  Disk I/O

×  Processing (CPU)

×  Database

×  External

HTTP Requests ×  Not every request is the same

×  Anonymous requests ×  Authenticated requests

×  Requests are handled in a thread

×  Every request takes memory

×  Every request take processing

×  They may be using disk, DB and/or externals

What to look for ×  When optimizing you don’t look for everything

×  Look for hotspots

×  Requests that takes too long

×  Requests that generate locks

×  Tune up memory/threads relation

×  Tune up the max threads the server can handle

×  Tune up DB according to it’s usage

×  Where/when it breaks!

To the rescue: jMeter ×  jMeter is cross platform (made in Java)

×  Can trigger multiple instances from different machines at once

×  Can record your activity and then customize it

×  Can assert

×  Is configurable and programmable

×  Can run many kind of loops and threads

Are we done yet? ×  We are never done

×  An application and server needs to be adjusted over time

×  Based on users and data growth