Performance Reliability

Reliability under Load

I’m a big fan of performance reliability, and it isn’t the expensive & ‘cheap thinking’ type that is failover and resilience.  I’m talking about ‘functional performance resilience’ – the one where your system doesn’t blow up because someone somewhere has entered something silly or there has been a series of system defects that causes the system to […]

Creating a Performant System

Custom Graphs

“Hmmm, how can I make a system more Performant….?” .  I was tasked recently with making a fairly large system “More Performant” and I thought – what is a Performant system?  I’ve come across the term a fair bit recently and everyone has a slightly different view of what Performant is.   If everyone has a […]

Problems With an encapsulated approach

Unforeseen costs

Unforeseen Costs of an encapsulated approach:  We need to abstract, encapsulate and hide complexity in order to build complex behaviour   This is why we have OO, SOAP, web services and other SOA approaches.  But for all the benefits they give I see practical disadvantages emerging in the real world.  As we sew more encapsulated objects together there is […]

Revisiting Performance Testing Basics


In this article, I have attempted to clarify some basic and most important terminologies and concepts pertaining to performance and the load testing arena. The Performance of web sites is increasingly becoming important. Companies are realising the importance of snappy performance. Losses caused to businesses due to poor performance issues can be huge (including the company’s image). […]

AJAX TruClient – Parameterization, Text Verification and Object Identification


Everyday I see at least one discussion or thread related to Ajax TruClient protocol. Many performance engineers across the world are starting to use this protocol to test their web apps. Most of the questions on TruClient technology are based on three primary steps of scripting – Parameterization, Text Verification and Corelation. In this article, I will walk […]

Performance Testing is hitting the wall

Load Testing is breaking

I’m going to write about something that has been increasingly concerning me.   The current method of Performance Testing – capture network level traffic, inspection, correlate, and then replay, is becoming more difficult.  In the good old days we had simple GET and POST requests.  Then Ajax and Web2 came along, making things a little trickier.  […]

Concurrency of Users Vs Increasing Transaction Rate

Large Number of Users

I’m going to write about increasing the number of transactions to simulate a higher number of Virtual Users.  This is a common technique used by performance testers to ‘cheat’ or rather avoid the high costs associated charged by vendors.  I recently answered a question on Linkedin and suggested increasing the transaction rate. I was sent the following message […]

LoadRunner to JMeter – A successful transition


 It all began on the day when a bunch of three performance testers were given a task of migrating the performance testing activities of multiple applications of a client to an open source tool. This included architectural level migration, resource knowledge transition and testing-operation transition from a licensed tool (LoadRunner) to an open source tool. […]

Performance Benchmark Testing Part II

Performance Benchmarking

My previous article details an approach for creating Performance Benchmarks.  I will build on the foundations laid out and describe how a powerful process was created on a customer site using these principles. Benchmarking Problem: I’m going to describe how I took a benchmarking process that took 2+ days, involved lots of manual intervention, was prone […]