Allocating memory for the JVM: A case study

This post is about a recent performance tuning exercise. As always, these start with vague statements about symptoms. This time the devil took the form of “The application is slow and we do not have the access to source code. What are our options to improve the situation”.

A closer look to the application revealed it consisting of several batch jobs bundled together. Drilling down through the “performance” criteria revealed that the time it takes to run a specific job was taking a bit too long. Some more scrutinising later I was given a measurable target. I needed to shave off two minutes from a particular job runtime to fit in a pre-allocated time window.

The troubled application was a pretty innocent-looking small JAR file. Which, to my luck also bundled the load tests.

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