Roman Grebennikov

Roman Grebennikov

A personal blog & info page

07 Apr 2018

Case classes ate my RAM

Case class is a most widely used way to model your data. But when the data is huge, you can amazingly discover that only a tiny 10% of your precious RAM used for the data itself. But where is other 90%?

During this talk, you will have a deep dive to the JVM internals learning about case class layout, Scala collections true memory overhead and ways to decrease it. We’ll introduce a scala-packed, the project helped Findify to solve a real-life case of reducing memory usage by an order of magnitude by extending Scala collections with transparent Shapeless-based case class <-> Array[Byte] packing.

Presented at SCALAR 2018, 2017, Scala User Group Voronezh 2018

Link | Video | Slides | Slides rus