Archivos del mes: 28 julio 2014

Micro-optimization: the surprising inefficiency of readonly fields

Jon Skeet's coding blog

Introduction

Recently I’ve been optimizing the heck out of Noda Time. Most of the time this has been a case of the normal measurement, find bottlenecks, carefully analyse them, lather, rinse, repeat. Yesterday I had a hunch about a particular cost, and decided to experiment… leading to a surprising optimization.

Noda Time’s core types are mostly value types – date/time values are naturally value types, just as DateTime and DateTimeOffset are in the BCL. Noda Time’s types are a bit bigger than most value types, however – the largest being ZonedDateTime, weighing in at 40 bytes in an x64 CLR at the moment. (I can shrink it down to 32 bytes with a bit of messing around, although it’s not terribly pleasant to do so.) The main reason for the bulk is that we have two reference types involved (the time zone and the calendar system), and in Noda…

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