Test concio001 failures on PPC Mac OS X

[Thorkil Naur]

Hello,

I am unable to make the new test concio002 fail on the PPC Mac where I was 
able to make concio001 fail. So that seems to have fixed the problem.

Best regards
Thorkil
On Monday 18 February 2008 11:23, Simon Marlow wrote:
> naur at post11.tele.dk wrote:
> > Hello,
> > 
> > The test case concio001 fails like this on the PPC Mac OS X builder 
tnaur-ppc-osx, most likely because of a simple timing problem:
> > 
> >> =====> concio001(normal) 
> >> cd . && $MAKE -s --no-print-directory test.concio001    </dev/null 
>concio001.run.stdout 2>concio001.run.stderr
> >> Actual stdout output differs from expected:
> >> --- ./concio001.stdout.normalised       2008-02-06 08:18:52.000000000 
+0100
> >> +++ ./concio001.run.stdout.normalised   2008-02-06 08:18:52.000000000 
+0100
> >> @@ -1,2 +1 @@
> >> -child
> >>  parent
> >> *** unexpected failure for concio001(normal)
> > 
> > Briefly, the test uses
> > 
> >> (sleep 1; echo x) | ./concio001
> > 
> > to run the program
> > 
> >> $ cat concio001.hs 
> >> import Control.Concurrent
> >>
> >> main = do
> >>   forkIO $ do threadDelay  100000; putStrLn "child"
> >>   getLine
> >>   putStrLn "parent"
> >> $ 
> > 
> > expecting the sleep 1 delay to be sufficient for the program to start 
running, performing its threadDelay and printing the "child" string, before 
the "parent" gets its input "x". But apparently, sleep 1 is insufficient in 
some cases.
> > 
> > If I run the test by hand, it succeeds. If I run the test alongside other 
processes that tries to spend disk I/O bandwith and/or CPU and/or memory, I 
am able to make it fail. So it appears that such circumstances are present 
during the buildbot running of the concio001 test.
> > 
> > I am not sure how to cure this. I am confident that simply increasing the 
sleep time would remove the problem in practice. However, perhaps some less 
brittle solution could be found.
> 
> While you're looking at this one, could you verify that we can now close 
#1523?
> 
> http://hackage.haskell.org/trac/ghc/ticket/1523
> 
> I'm going to disable this concio001 test and replace it with one that is 
> hopefully more reliable, I'll push after I've validated it.
> 
> Cheers,
> 	Simon
>