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  • Glasgow Haskell CompilerGlasgow Haskell Compiler
  • GHCGHC
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  • #5030
Closed
Open
Issue created Mar 16, 2011 by Serguey Zefirov@trac-Serguey_Zefirov

Slow type checking of type-level computation heavy code.

It seems we encountered a highly non-linear complexity in type checking.

I attached a "simple" program that produces the effect.

The time needed to load complete file in ghci depending on number of lines in longCompilingProgram:

  • 4 lines - 2 secs,
  • 8 lines - 10 secs,
  • 12 lines - 27 secs,
  • 16 lines - 59 secs.

time = 0,0156lines^3^ - 0,0937lines^2^ + 1,375lines - 3

Trac metadata
Trac field Value
Version 7.0.2
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler (Type checker)
Test case
Differential revisions
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Blocking
CC
Operating system
Architecture
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