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This talk describes how to view live heap structures in Haskell, including sharing and unboxing information, and then to use insights on the representation of data to improve the performance and space, for the first time, of uniform polymorphic data types by changing their representation. We’ll use associated data types to guide regular optimizations of polymorphic structures.

The library described in this talk is available on hackage, along with the visualization tool used to build it. There’s also a screencast of the visualization tool in use.

This talk was originally presented at WG2.8 in Frauenchiemsee, Germany in June 2009.