> Heap usage after compiling my program with -O is vastly
> different (at least 10x more) than without -O. Why? How
> can I prevent this? (other than, of course, not using -O)
One possible cause of this is the full-laziness (or
almost-full-laziness) transformation that GHC performs when -O is on.
If you're up to reading core, then -ddump-simpl or -dverbose-core2core
might help you figure out what's going on, after you've narrowed down
the culprit with heap profiling.
Unfortunately we don't have a way to turn off full-laziness at the
moment, aside from patching the compiler. The optimisation pass
ordering is specified in main/DriverState.hs, in the function
'buildCoreToDo'.
Cheers,
Simon
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