Compiling with optimizations on hurts performance
The attached program runs many times slower when compiled with optimizations (4.5 seconds vs. 1.5 minutes on my machine).
I wasn't able to reduce the program to a small snippet so I attach the whole thing (including data files to process).
I compiled and ran like this:
ghc --make test2.hs time ./test2
And then
ghc --make test2 -fforce-recomp -O time ./test2
Trac metadata
Trac field | Value |
---|---|
Version | 6.10.4 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |