#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 hvr): Replying to [comment:16 AndreasVoellmy]:
When you say simplify, what are you comparing to? Is there some implementation of those functions that you are thinking of?
Your suggestion of using the new `threadWait*STM` functions seems to be already an improvement over the naive `timeout`+`threadWait{Read,Write}` approach. I was originally thinking of a more low-level approach: Since `epoll`/`select` and similar OS sys-calls take a `timeout`-argument, that argument would be set according to the earliest due pending `threadWait*WithTimeout` calls when the need arises to actually call `epoll` to wait for new I/O events. Or does this implicitly happen anyway when using `registerDelay` which goes through the `TimeManager`? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8733#comment:17 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler