#8733: I/O manager causes unnecessary syscalls in send/recv loops --------------------------------------------+------------------------------ Reporter: tibbe | Owner: simonmar Type: bug | Status: new Priority: normal | Milestone: 7.10.1 Component: Runtime System | Version: 7.6.3 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime performance bug | Unknown/Multiple Test Case: | Difficulty: Unknown Blocking: | Blocked By: | Related Tickets: --------------------------------------------+------------------------------ Comment (by schyler): If I understand correctly, this can be implemented as a state machine. Each thread can have a "last IO action" state which gets reset when it yields and set to some constant on send/recv. Then, if you call recv and it's still in send mode, yield automatically (and yield would set it back to NULL). -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8733#comment:8 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler