How to detect and diagnose slow code in production

One of the more difficult tasks that a developer faces is finding and diagnosing slow running code in production. Firstly…

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JMH: How to setup and run a JMH benchmark

Health Warning! This post describes how to setup and run a simple JMH benchmark.  Micro benchmarks are notoriously difficult to get…

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Maven Tip: All about executable jars

Maven Tip: All about executable jars An executable jar is an extremely useful artefact when it comes to distributing your…

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Java8 Multi-threading ForkJoinPool: Dealing with exceptions

One of the main motivations behind the introduction of Java8 lambdas was the ability to be able to use multicores…

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Java8 Lambdas: Sorting Performance Pitfall EXPLAINED

Written in collaboration with Peter Lawrey. A few days ago I raised a serious problem with the performance of sorting…

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Java Flight Recorder (JFR)

JFR is a Java profiler which will allow you to investigate the runtime characteristics of your code. Typically you will…

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Java8 Sorting – Performance Pitfall

Java 8 brings all the goodness of lambdas to enable us to program using a declarative style. But is it…

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My favourite Java puzzler 2 + 1 = 4

Here’s  my current favourite Java puzzler. How can you get your code to do this?          …

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First rule of performance optimisation

Let’s start with a system with no obvious performance bottlenecks.  By that I mean that there are no glaring algorithmic…

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