haskellguide/profiling-module

Learn how you can check to see if work is well balanced across the available processors and spot performance issues relating to garbage collection or poor load balancing.

profiling-module

Learn how you can check to see if work is well balanced across the available processors and spot performance issues relating to garbage collection or poor load balancing.

See examples from https://github.com/simonmar/parconc-examples PCPH

Tooling wise dig into https://wiki.haskell.org/ThreadScope

Content is available at http://dev.stephendiehl.com/hask/#threadscope

spaceleaks

• https://ro-che.info/articles/2017-01-10-nested-loop-space-leak
• http://blog.ezyang.com/2011/05/anatomy-of-a-thunk-leak/

pusher

TL;DR is looks like the wrong technology was chosen for the problem space:

https://making.pusher.com/latency-working-set-ghc-gc-pick-two/ and followup at https://stackoverflow.com/questions/36772017/reducing-garbage-collection-pause-time-in-a-haskell-program?noredirect=1#comment61127896_36772017

table of contents

checklist

• https://github.com/haskell-perf/checklist

ghc garbage collector fundamentals

• optimises for X over Y
• wherecan folks learn more?
• http://www.scs.stanford.edu/16wi-cs240h/slides/rts-lecture-annot.pdf

exercises

https://simonmar.github.io/slides/Haskell%20in%20the%20datacentre.pdf https://www.youtube.com/watch?v=vmFdJPs3DvU tba

additional materials

• https://www.youtube.com/watch?v=vmFdJPs3DvU

• https://www.microsoft.com/en-us/research/publication/parallel-performance-tuning-for-haskell/

• https://www.microsoft.com/en-us/research/publication/runtime-support-for-multicore-haskell

• https://www.microsoft.com/en-us/research/publication/a-tutorial-on-parallel-and-concurrent-programming-in-haskell

• https://simonmar.github.io/pages/pcph.html

• http://www.well-typed.com/blog/2014/02/ghc-events-analyze/