enormous compile times
Some modules cause ghc to take a very very long time (and a lot of memory) to compile, even without optimisations.
Here is an example of a module that takes almost forever to compile. The WASH/HTML/HTMLMonad98.hs
module from WASH-2.12 http://www.informatik.uni-freiburg.de/~thiemann/haskell/WASH/
It is a 185k, 5,800 line module consisting almost entirely of data, class and instance declarations.
It might be interesting to use this module as a test case to profile ghc's front end to see if there are any obvious inefficiencies or unecessary non-linear algorithms.
WASH/HTML/HTMLPrelude.hs
is almost as bad. Between the two of them they push the overall compile time for WASH to several minutes with -O0 and nearly half an hour with -O1. GHC's memory use while compiling WASH also grows to over 300Mb with -O0 and over 600Mb with -O1 (on a 64bit box).
All in all, WASH is an excellent stress test for GHC.
Trac metadata
Trac field | Value |
---|---|
Version | 6.8.1 |
Type | Task |
TypeOfFailure | OtherFailure |
Priority | low |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | Multiple |
Architecture | Multiple |