Our legacy site: www.webwob.com   

My HP LoadRunner Tutorial

A colleague asked me recently to show him my performance test scripts and show him how to run them. He wanted to become a commercial load tester. He had looked over this site and wanted to get started. BUT it's not very easy, so I'm building this area to try and help people to get started.

     LoadRunner CI/CD      *_LR_CI_*      LR_CI_+      Email_out      Email_in      Cookies 1      TUTORIAL      sprintf      debug      VUgen      Kill -9      disk space      AWS S3      dig (DNS++)      substitute      curl with timings      LR_Jenkins_graphs     
TUTORIAL:     Languages      Applications      Test Data      HTTP Sites      Pass Fail and SLAs      Log files      Analysis

Tutorial: Lesson 1

What is 'Load Testing' exactly?

The answer to that question might seem easy!

Well, sort off. (I should say I'm going to write this site like a blog, as things come to mind, so please bear with me if it's a bit convoluted in places...)

I'll define 'load testing' as:

    'Simulating real application load, in actual user scenarios, checking response times and long term stability.'

And the main aims in a commercial environment are:

    Confirm that the latest application release will work in PRODUCTION, before sending it live.

    Confirm that the latest release can service the full user load required

    Confirm that it is stable, long term, avoiding support team input being required for things like restarts etc.

There are of course a lot more details and there are questions such as the benefits and the value of even trying to do this. I'll try to cover as much of this as I can in these pages, along with how to get started commercially, from a QA or Developer role.

Getting started on this as a full time job can be difficult, mainly because computer system are necessarily complex and to do the job in a commercial environment, you do really need experience in these environments and to know how things fit together. And that includes teams of people, not just the machines. You need to be able to communicate with all the different teams and know who to talk to about all sorts of different technical issues.

I will try to cover as much ground as I can within these pages. It is a bit trial and error, depending on what's on my plate currently and how much free time I have to write it all up. Hopefully, this page will become more useful over time.

Areas I want to cover

I want to build a tutorial here, not for absolute beginners, but for developers or technical QAs who want to move into Performance Testing.

1. Code and languages used

2. Performance Testing applications, commercial, free and market leaders

3. Test data in theory and practice

4. What you need to know about websites (this tutorial concentrates on HTTP applications in the main)

5. Test passes and fails, SLAs and other requirements

6. Log files, trends and getting the data you need

7. Graphs, analysis sessions and management reports

8. More on Caches, data, Databases and test data selection etc.

Something to watch out for

It is easy in this field to get over-enthusiastic - to start ramping up the load, to see how far we can go... And this does have some benefits SOMETIMES. But you also need to be aware that computer systems are complex and clever. So as you change the load, they start to behave differently. They are designed to do this. And that means that it is easy to veer off from the required application behaviour. So it is important to make sure you are testing at realistic loads. Sometimes that will be very high peak loads that last a short time and sometimes it could be low level sustained loads, that carry on for hours, maybe days. And each of these scenarios need testing individually AND realistically - that means matching real log file activity...