Evaluation order, ghc versus hugs, lazy vs. strict

[Alastair Reid]

>> More importantly, understand how foldl' works and be ready to apply
>> the same analysis and fix to any similar function.

> This is what I cannot do for the moment. How do I find out what is
> really going on. Any pointers to a relevant articles/literature? 

Read the heap profiling papers from Chalmers, York and Glasgow - both
because you probably want to use one and because their analyses of
various leaks found with the profilers can be illuminating.

   http://www.math.chalmers.se/~augustss/AFP/overview.html
   http://www.math.chalmers.se/~rojemo/thesis.html
   http://research.microsoft.com/Users/simonpj/Papers/papers.html
   http://www.cs.york.ac.uk/fp/profile.html
   
   [York don't seem to put links to their pages on the web.  Citeseer
   may have some of them.]
   
You will probably end up learning some of what Haskell's syntactic
sugar really means along the way.

--
Alastair Reid                 alastair@reid-consulting-uk.ltd.uk  
Reid Consulting (UK) Limited  http://www.reid-consulting-uk.ltd.uk/alastair/