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# The Glasgow Haskell Compiler
## Some GHC Flags
-v verbose mode
-O2 level 2 optimizations
-rtsopts allow +RTS flags
-prof enable basic time and allocation profiling
-auto-all cost centers on all top level functions
(you can also add them via the SCC pragma)
-fprof-auto replaced -auto-all
-caf-all generate data for CAFs (constant applicative forms)
-fprof-cafs replaced -caf-all
-fforce-recomp force recompilation
-threaded Use threaed runtime
-eventlog enables +RTS -l flag
-Wall
-Werror
-no-hs-main supress linking main module
Notes: you will obtain the profiling versions of dependancies via:
stack install --profile [libraryname]
## Some +RTS flags
-K set stack limit
-s statistic reporting
-p profiling
-hc extract heap profile
-hy allocation by type
-hd allocation by constructor
-ix x is sampling frequency in seconds. e.g. 0.01)
-Nx x is number of cores to utilize
-l emit log file (can be used threadscope)
-ddump-simpl generate core
Note: render the heap profile as graph with: hp2ps -e8in -c file.hp
show eventlog with: threadscope file.eventlog
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