About Richard Warburton

Richard is a Principle Software Engineer at jClarity, interested in deep dive performance issues and compiler verification, Adopt-aJSR, Adopt OpenJDK and the LJC. He holds a PhD from the University of Warwick and lives in London.

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An open source JVM Sampling Profiler

It’s a well known deficiency of most existing sampling Java profilers that their collection of stack traces has to happen at a safe point. This is the case for profilers such ...
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Javaone 2013 Review

tl;dr I attended Javaone again this year. It was fun. Sunday The conference kicked off on Sunday, with user group sessions and the main keynote. I was actually unable to attend those, ...
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Performance tests for slow networks with tc

tl;dr: you can easily replicate slow network conditions which makes it easier to performance test them. Smartphones have made both mobile websites and apps that have to connect in mobile ...
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Garbage Collection in Java (4)

G1: Garbage First The G1 collector is the latest collector to be implemented in the hotspot JVM. Its been a supported collector ever since Java 7 Update 4. Its also been publicly stated ...
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Testing Java 8 in 3 Easy Steps

tl;dr Use your CI Setup to test Java 8. The upcoming Java 8 release promises a bunch of new feature for Java developers, but there’s always a risk when upgrading that your code ...
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Lambdas: coming to a Java 8 near you!

What are Lambdas? A lambda expression is a type of anonymous function, that can be written inline within a method and used wherever expressions are used. Sometimes you might find them ...
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Garbage Collection in Java (3)

This follows on from my previous two garbage collection blog posts:Overview of GC in Hotspot. Parallel Garbage Collectors.Concurrent Mark Sweep The parallel garbage collectors in ...
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Garbage Collection in Java (2)

Parallel Scavenge Today we cover how Parallel GC works. Specifically this is the combination of running a Parallel Scavenge collector over Eden and the Parallel Mark and Sweep collector ...
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Garbage Collection in Java (1)

This is the first in a series of posts about Garbage Collection (GC). I hope to be able to cover a bit of theory and all the major collectors in the hotspot virtual machine over the ...
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