Sharing Load Generators in HP Performance Center

One of the most appealing features of HP Performance Center is the automatic resource management. The Performance Center infrastructure can be shared between multiple test projects. Each project bundles the test scripts, test data and the associated load test configurations. Several load generators (aka. hosts) can be assigned to a Performance Test Project. From the […]

Using LR Download Filter to protect your measurements

This post will show how to exclude calls to external systems using Loadrunner; this allows the AUT to be tested in isolation.  A typical webpage relies on a number of resources which are external to the site. Analytics services, embedded social media, advertising assets and different Google Services (maps, charts, etc.) are good examples for […]

Modeling spike tests with HP Performance Center

This post will show how to create a Performance Spike Test using HP Performance Center. Spike testing can be characterised as an abnormal surge in traffic for a short period.  Reasons can include: An advertising campaign has just been launched, special offers being made available or an offer has just been opened and there is pent up demand.  Modelling […]

Creating Custom Metric Graphs with HP Loadrunner

This post will describe how to create your own custom metric graphs in HP Loadrunner. Using the Analysis tool you can view the standard metrics of a Load Test. But you can also use the VuGen scripts to report your own numbers as ‘User Data Points’ and feed them into the Analysis component. Let’s assume you […]

Pacing Loadrunner User Scenarios

This article will describe the different options for pacing available within Loadrunner and outline how they can be used.  In the pervious blog  we calculated the necessary number of virtual users to produce the desired load.  The previous formula relied on the length of the user scenario. How does the load generator execute the script? The generator starts […]

Calculating the number of Virtual Users to achieve the target load using HP Loadrunner

With Performance Center you can configure the number of virtual users for your test scenario. This blog describes how to use it with the scenario runtime length to target the test system with the required load. Business requirements (if there are any) should state how much load the website is expected to handle. The definition […]

Custom LoadRunner Transaction Reporting

This article will detail a means of reporting on long-running, problematic transactions using a custom C function. If you discover a particular transaction that appears to have a high deviation of response time (for example through its standard deviation or percentile profile), you’ll probably want to find out what’s causing it. For example, you might […]

Pricing for Load Testing Tools

This article aims to describe the different pricing structures you may face when evaluating commercial load testing tools.  I’ll use the market leading performance test tool for a concrete illustration – HP Performance Center also commonly referred to as Loadrunner.  I was called in to act as a Performance consultant on behalf of a client that had an urgent need […]

Avoiding HP Performance Center installation problems

Recently I installed HP Performance Center internally onto my companies infrastructure (Version 9.52). In this post I would like to share my experiences and give you some tips on how to avoid the installation problems I encountered. HP Performance Center is a comprehensive enterprise-grade software solution for executing, monitoring and reporting load tests. The logical structure of the product has […]