#5773: main = forever (putStrLn =<< getLine) continuously saturates a CPU when
compiled
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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 lpsmith):
Ok, I was mistaken. The program I though I compiled with ghc-7.4.1-rc1 I
actually compiled with ghc-7.0.3, and so the program I used to test
{{{threadWaitRead}}} also saturates the CPU. Although it may not be of
any great interest to the bug-hunters, I'll attach the program, it's a
straightforward port of a sample program from the PostgreSQL source
distribution to the http://hackage.haskell.org/package/postgresql-libpq
bindings.
So it seems to be a problem with blocking IO in general. I find it
curious that none of my test programs exhibit this problem when run inside
GHCi.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5773#comment:4>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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