#8733: I/O manager causes unnecessary syscalls in send/recv loops --------------------------------------------+------------------------------ Reporter: tibbe | Owner: 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 tibbe): Replying to [comment:12 AndreasVoellmy]:
I would be interested to know what the source of the overhead is when making the recvfrom call that fails. I.e. is due to having more syscalls or from invoking the IO manager (Haskell-land) code to register the callback (requires taking an MVar, etc).
Good question. I have a theory that the `MVar` overheads might be hurting us and integrating the I/O manager with the scheduler could allow us to get around that. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8733#comment:14 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler