I really wish that the build system could record RTS statistics on a
#13426: compile-time memory-usage regression for DynFlags between GHC 8.0 and GHC 8.2 -------------------------------------+------------------------------------- Reporter: hvr | Owner: (none) Type: bug | Status: new Priority: high | Milestone: 8.2.1 Component: Compiler | Version: 8.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D3399, Wiki Page: | Phab:D3400, Phab:D3421 -------------------------------------+------------------------------------- Comment (by hvr): Replying to [comment:40 bgamari]: per-file basis (e.g. perhaps just emitting a log file per GHC process). That would make collecting this sort of thing much easier. We already emit some extra output (mostly for debugging purposes) to `-dumpdir dir`, so there'd be precedent to use output files for logging data, rather than dump it to stdout only. So one way would be to extend `-Rghc-timing` to optionally take a filename, e.g. `-Rghc-timing=rts- stats.log`; similarly for other statistics David pointed out (e.g. optimiser stats). -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13426#comment:41 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler