Andreas Grabner

About the Author

Andreas Grabner has been helping companies improve their application performance for 15+ years. He is a regular contributor within Web Performance and DevOps communities and a prolific speaker at user groups and conferences around the world. Reach him at @grabnerandi

Finding and Fixing Memory Leaks in Tibco Business Works

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We are working with a lot of performance engineers that have Tibco Business Works (BW) in the mix of technologies they are responsible for. This particular story comes from A. Alam – a performance engineer who is responsible for a large enterprise application that uses Tibco to connect their different system components. Alam and his team identified 2 unrelated memory leaks in their Tibco installation using Dynatrace Application Monitoring. One of the leaks was caused by a ... More >

Struts Performance Bug Almost Takes Down Car Rental Web site

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Special thanks for this great story to my colleagues Shaun Gautz and Andrew Samuels – two Dynatrace Guardians helping our customers to build better web applications. Struts is a framework very commonly used for building Java Web Applications. It’s also been used as the main web framework for a new car rental platform this story is based on. During load and performance testing it was discovered that the application couldn’t sustain a fraction of the load that was expected. ... More >

Hands-On Tutorial: 5 Steps to Identify Java and .NET Memory Leaks

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I keep getting questions about how to best analyze memory leaks – especially when they are not always reproducible by the developer on the local workstation. If you never experienced a memory leak issue (or you simply don’t admit it) then read up on some real life examples on our blog: Fixing Memory Leak in Java Production Environment or DevOps way to solving Memory Issues. If you want to test this out on your Java or .NET Application follow my steps in this blog, watch my ... More >

Find the Root Cause Faster with Dynatrace 6.1

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I am pleased to announce that Dynatrace 6.1 Beta is now available for everyone that is interested in building better performing applications. Dynatrace 6.1 includes many enhancements requested by our 83k+ user community. We took the feedback we received from our users and invested heavily in Ease of Use and more Automatic Diagnostics. Follow these steps to setup Dynatrace for a typical Java Web Application – or watch my YouTube Tutorials (for Java, .NET and PHP) – to see ... More >

How 15 Minutes Spent on Optimizing Performance Could Save you Millions in Lost Revenue

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Whether you are well established e-Commerce brand such as Nordstrom, JCPenny, or Costco, or a small business with a web shop, it’s never too late to do your end user performance homework. Robert, who developed and runs a “smaller” ASP.NET MVC based web shop, started getting individual user complaints about performance and usability problems. A simple online Performance Test  revealed that the site was not among the fastest when compared to other players in the ... More >

Web and App Server Monitoring Basics: Trending Transaction Performance and Throughput

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On our about:performance blog we talk a lot about problem patterns such as too many database statements, wasteful memory management leading too much garbage collection, web performance worst practices or performance of cloud and virtualized environments. I was recently intrigued by a couple of screenshots my colleague Reinhard showed me which give a perfect overview of load and response time behavior based on a set of very basic performance metrics. For me the following ... More >

Bad Deployments: The Performance Impact of Recursive Browser Redirect Loops

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100% Coverage I just recently wrote a blog about BOTs causing unwanted traffic on our servers. Right after I wrote this blog I was notified about yet another “interesting” and unusual load behavior on our download page which is used by customers to download latest product versions and updates: If you see such a load behavior you typically assume that you just released a new product version or maybe an update to our agents and many people are downloading it like crazy. ... More >

dynaTrace: Correcting Mis-Representations

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It’s hard to argue with facts. That’s probably why AppDynamics’ spin machine has been hard at work lately, trying to find distorted angles and mis-representations about our capabilities. This is an attempt to distract from their own shortcomings and the fact that this year again customers on the market for a new generation APM, favored Dynatrace over anyone else. I thought it was time to give you the facts and set the record straight. And unlike our competitor, I welcome ... More >

Detecting Bad Deployments on Resource Impact and Not Response Time: Hotspot Garbage Collection

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This story came in from Joseph - one of our fellow dynaTrace users and a performance engineer at a large fleet management service company. Their fleet management software runs on .NET,  is developed in-house, is load tested with JMeter and monitored in Production with dynaTrace. A usage and configuration change of their dependency injection library turned out to dramatically impact CPU and memory usage while not yet impacting end user experience. Lessons learned: resource ... More >

How to Optimize the Good and Exclude the Bad/ Bot Traffic that Impacts your Web Analytics and Performance

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This blog is about how a new generation of BOTs impacted our application performance, exploited problems in our deployment and skewed our web analytics. I explain how we dealt with it and what you can learn to protect your own systems. Another positive side-effect of identifying these requests is that we can adjust our web analytic metrics we report to management. Tools like Google Analytics can’t exclude all of these requests as they cannot always be identified by IP ... More >