#13164: idle time full GCs (idle cpu usage) -------------------------------------+------------------------------------- Reporter: lspitzner | Owner: Type: feature request | Status: new Priority: normal | Milestone: Component: Runtime System | Version: 8.0.1 Resolution: | Keywords: idle GC 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 lspitzner): I think it would be a good approach to keep the current delay, but to insert some kind of conditional around actually running the full GC. This condition could take into account e.g.: - The time since the last (actually-performed) idle GC. This would reset if a non-idle full GC is performed. - The number of bytes collected by the last idle GC, perhaps in relation to the residency. (If you collect less than 10% of heap as garbage, it is probably not worth to run the GC too often). - The number of bytes allocated since the last full GC (idle or not). I don't know if these statistics are available, but at least the first should be easy to implement. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13164#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler