Compiling DynFlags is jolly slow
Compiling DynFlags
really takes a long time these days.
Ian thinks that it's due to the Read
and Show
instances he has added (see attached W2.hs
.
Simon M suggests: instead of using Read/Show
, you could generate some code in mkDerivedConstants
to use ReadP
and Outputable
, which should be much smaller and faster.
This ticket is
- To see if we can speed up compilation of
DynFlags
- To check WHY it is so slow. Are there any lessons we can learn or ways to make it compile faster? Is it tickling some asymptotically-bad corner of the compiler?
Simon
Trac metadata
Trac field | Value |
---|---|
Version | 7.6.1 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |