Infrastructure/Utrecht-Hacking-Notes

Notes from Utrecht on future directions for packages and infrastructure

containers

Work underway to do general performance improvements to the containers package, based on worker/wrapper and other idioms. New repository for work on patch-tag:

• https://patch-tag.com/r/dons/containers/home

Added test suite and coverage data, (increased coverage to > 50%)

• http://code.haskell.org/~dons/tests/containers/hpc_index.html

Investigate certain functions, then determine if anything on Hackage uses them. If no such package is found using the Map function, remove it from the API -- 20 years and 2000 packages should be enough empirical evidence.

Added benchmarking suite:

Improved performance:

Candidates for removal:

Function	Reason	Comment
notMember	Trivial composition of not and member
find	Unsafe. Also has an operator with the same functionality
findWithDefault	Should be renamed to lookupWithDefault for consistency
updateWithKey	The caller already has the key
updateLookupWithKey	The caller already has the key. updateLookup could be useful though
adjust	Simply calls adjustWithKey that calls updateWithKey
adjustWithKey	Simply calls updateWithKey

hackage 2

Ready Hackage 2 for use.

• Basic docs: http://hackage.haskell.org/trac/hackage/wiki/HackageDB/2.0/Architecture
• http://code.haskell.org/hackage-server
• http://sparky.haskell.org:8080/

network

network package is low level, difficult to maintain and fragile. Rewrite using design from python?

hashmaps

Based on Patricia trees and using MurmurHash.

hashtables

Fast, open addressed hashtables: useful, but relatively small ROI. Also quite complex.

text

Propose text for the HP.

platform

Generate unified docs for the HP.