#15938: Hadrian's recompilation check is extremely slow -------------------------------------+------------------------------------- Reporter: bgamari | Owner: (none) Type: bug | Status: new Priority: high | Milestone: 8.8.1 Component: Build System | Version: 8.6.2 (Hadrian) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by tdammers): `+RTS -s` output when starting on a half-built tree; kept hadrian running until the first proper compilations happen ("Run Ghc CompileHs ..."): {{{ 16,130,616,376 bytes allocated in the heap 1,080,660,392 bytes copied during GC 149,548,072 bytes maximum residency (12 sample(s)) 1,189,912 bytes maximum slop 339 MB total memory in use (0 MB lost due to fragmentation) Tot time (elapsed) Avg pause Max pause Gen 0 14677 colls, 0 par 0.952s 1.016s 0.0001s 0.0022s Gen 1 12 colls, 0 par 0.532s 0.640s 0.0533s 0.1704s TASKS: 5 (1 bound, 4 peak workers (4 total), using -N1) SPARKS: 0 (0 converted, 0 overflowed, 0 dud, 0 GC'd, 0 fizzled) INIT time 0.000s ( 0.000s elapsed) MUT time 9.544s ( 13.735s elapsed) GC time 1.484s ( 1.656s elapsed) EXIT time 0.000s ( 0.009s elapsed) Total time 11.028s ( 15.400s elapsed) Alloc rate 1,690,131,640 bytes per MUT second Productivity 86.5% of total user, 89.2% of total elapsed }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15938#comment:25 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler