[GHC] #8733: I/O manager causes unnecessary syscalls in send/recv loops

[GHC]

#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:14 tibbe]:
 > 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.

 Just wondering, would integration with the scheduler simplify implementing
 (soft) timeouts, like e.g. providing

 {{{#!hs
 threadWaitReadWithTimeout, threadWaitWriteWithTimeout :: Fd -> Int -> IO
 Bool
 }}}

 directly in the I/O manager?

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8733#comment:15>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler