#5773: main = forever (putStrLn =<< getLine) continuously saturates a CPU when
compiled
-------------------------------+--------------------------------------------
Reporter: lpsmith | Owner: simonmar
Type: bug | Status: new
Priority: highest | Milestone: 7.4.1
Component: Compiler | Version: 7.4.1-rc1
Keywords: | Os: Linux
Architecture: x86_64 (amd64) | Failure: Runtime performance bug
Difficulty: Unknown | Testcase:
Blockedby: | Blocking:
Related: |
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Comment(by marlowsd@…):
commit fac8ecbbafde17dd92439c41747223c43e9d2b80
{{{
Author: Simon Marlow <[email protected]>
Date: Mon Jan 16 09:49:24 2012 +0000
Fix bug causing polling instead of blocking in the non-threaded RTS
(#5773)
This was a regression introduced accidentally in
6b1098511aaabd2c9503ee7be6da1944466f9cb4. We were previously passing
a large time value to select() to simulate blocking, and this broke
due to a change from unsigned to signed arithmetic. I've refactored
it to be less fragile now - we just pass NULL as the timeval parameter
to select(), which is the correct way to do blocking.
rts/posix/Select.c | 35 +++++++++++++++++------------------
1 files changed, 17 insertions(+), 18 deletions(-)
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5773#comment:7>
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