Compilation slowdown from 7.0.x to 7.2.x
Compile time performance for GHC appears to have slowed down significantly for the package:
Time to compile the package:
- GHC 7.0.4: 3m57s
- GHC 7.2.1: 49m22s
- GHC 7.2.2: 49m56s
The culprits are the Happy generated modules:
Language.Python.Version3.Parser.Parser Language.Python.Version2.Parser.Parser
GHC uses up to 700MB of memory compiling these files (my machine has 2GB of RAM and it does not appear to be thrashing during the compilation).
All versions of GHC in this ticket were downloaded as binary packages from the ghc website.
System:
OS X 10.7.2
- 4 GHz Intel Core 2 Duo
2GB RAM GCC 4.2.1
Trac metadata
| Trac field | Value |
|---|---|
| Version | 7.2.1 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler |
| Test case | |
| Differential revisions | |
| BlockedBy | |
| Related | |
| Blocking | |
| CC | |
| Operating system | |
| Architecture |