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Using the external concurrent-output library lets it be built with -O2 as
is needed to get good runtime memory use.
Enabling -O0 because ghc is using rather a lot more time and memory due to
the new more complex types.
old master branch:
Linking dist/build/propellor-config/propellor-config ...
24.59user 0.97system 0:25.93elapsed 98%CPU (0avgtext+0avgdata 354612maxresident)k
1544inputs+46064outputs (0major+371244minor)pagefaults 0swaps
this branch before -O0:
Linking dist/build/propellor-config/propellor-config ...
25.56user 0.73system 0:26.61elapsed 98%CPU (0avgtext+0avgdata 345348maxresident)k
0inputs+43480outputs (0major+364163minor)pagefaults 0swaps
this branch with -O0:
Linking dist/build/propellor-config/propellor-config ...
11.91user 0.75system 0:12.97elapsed 97%CPU (0avgtext+0avgdata 237472maxresident)k
16inputs+37264outputs (0major+336166minor)pagefaults 0swaps
Above benchmarks are building all source files needed by config-simple.hs.
The story is rather worse for joeyconfig.hs; building it now needs over 500 mb
even with -O0 :-/
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