Experiments in program optimisation

pzemtsov.github.io

optimisation performance de-multiplexing Java C C++ macro meta-programming idiom templates GCC SSE AVX bug cache streams socket buffering stdin stdout affinity hashmap life assembly refactoring design-patterns Peano search matching alignment parallel real-time Linux Windows

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Systems & Performance 2 Software Engineering 2

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The slow currentTimeMillis()

2017323 points52 comments Systems & Performance details

Today we’ll look at one of the most basic and the most often used methods from the Java library: System.currentTimeMillis() .

A bug story: data alignment on x86

2016151 points187 commentscited by 6Systems & Performance details

This sounds unusual. Who ever wants to do this in real life? Normally, we only see code like this as primary school assignments or compiler benchmarks. However, this time it happened in real life.