recomp013

[Simon Peyton-Jones]

No, it fails on Linux.  Mostly but not invariably.  Running it by hand (ie with TEST=recomp013) fails 9 times out of 10 and succeeds once.  Weird.

Simon

| -----Original Message-----
| From: Simon Marlow [mailto:marlowsd at gmail.com]
| Sent: 23 September 2013 12:08
| To: Gabor Greif; Simon Peyton-Jones
| Cc: Joachim Breitner; ghc-devs at haskell.org
| Subject: Re: recomp013
| 
| Is it failing on Windows only?  It could be an issue with the
| granularity of timestamps.  I think we use more accurate timestamps on
| Linux nowadays, whereas Windows is still using 1 second granularity.  If
| that's the case, it probably needs a "sleep 1" somewhere.  If the "sleep
| 1" didn't help, perhaps it wasn't in the right place - it needs to be
| before the second set of echo commands.
| 
| On the subject of naming the test, we want two pieces of information in
| the name:
|    - what it tests
|    - the ticket number, if it's a regression test
| So rather than just renaming it to the ticket number (which would lose
| the information that it's a recomp test), I suggest moving all the
| recomp tests into their own directory first.  It's really useful to have
| all the tests for a component together, so you can run them quickly when
| you're working on that component.
| 
| Cheers,
| 	Simon
| 
| On 19/09/2013 08:57, Gabor Greif wrote:
| > On 9/19/13, Simon Peyton-Jones <simonpj at microsoft.com> wrote:
| >> I lied.  Whether or not the 'sleep' is there, the test usually fails,
| but
| >> occasionally (one time in ten or so) succeeds.
| >
| > I am the originator of the bug report, and could consistently
| > reproduce it in a bigger project. Unfortunately I have no time
| > currently to dive into the issue, but I have it earmarked for later.
| >
| > Cheers,
| >
| >      Gabor
| >
| >
| >>
| >> SImon
| >>
| >> | -----Original Message-----
| >> | From: ghc-devs [mailto:ghc-devs-bounces at haskell.org] On Behalf Of
| Simon
| >> | Peyton-Jones
| >> | Sent: 19 September 2013 12:50
| >> | To: Joachim Breitner; ghc-devs at haskell.org
| >> | Subject: RE: recomp013
| >> |
| >> | that makes it work.!
| >> |
| >> | | -----Original Message-----
| >> | | From: Joachim Breitner [mailto:mail at joachim-breitner.de]
| >> | | Sent: 19 September 2013 12:41
| >> | | To: Simon Peyton-Jones; ghc-devs at haskell.org
| >> | | Subject: Re: recomp013
| >> | |
| >> | | Dear Simon,
| >> | |
| >> | | Am Donnerstag, den 19.09.2013, 11:33 +0000 schrieb Simon Peyton-
| Jones:
| >> | | > =====> recomp013(normal) 89 of 114 [0, 0, 0]
| >> | | > cd ./recomp013 && $MAKE -s --no-print-directory recomp013
| >> | | </dev/null >recomp013.run.stdout 2>recomp013.run.stderr
| >> | | > Actual stdout output differs from expected:
| >> | | > --- ./recomp013/recomp013.stdout	2013-09-18 12:38:22.000000000
| >> | +0100
| >> | | > +++ ./recomp013/recomp013.run.stdout	2013-09-19
| 12:15:22.611120935
| >> | | +0100
| >> | | > @@ -3,5 +3,3 @@
| >> | | >  [2 of 3] Compiling B                ( B.hs, B.o )
| >> | | >  [3 of 3] Compiling C                ( C.hs, C.o )
| >> | | >  second run
| >> | | > -[2 of 3] Compiling B                ( B.hs, B.o )
| >> | | > -[3 of 3] Compiling C                ( C.hs, C.o ) [B changed]
| >> | | > *** unexpected failure for recomp013(normal)
| >> | |
| >> | | It works here. So that means either two things:
| >> | |  * that the bug described in #8247 is actually present in HEAD,
| but
| >> | |    only under certain circumstances, or
| >> | |  * that there is a timing issue with the update of B.hs.
| >> | |
| >> | | The latter seems to be more likely. I notice that other recomp-
| tests
| >> | | have a "sleep 1" before updating the file: If you insert that in
| >> | | recomp013/Makefile, does it go through for you?
| >> | |
| >> | | Greetings,
| >> | | Joachim
| >> | |
| >> | | --
| >> | | Joachim "nomeata" Breitner
| >> | |   mail at joachim-breitner.de * http://www.joachim-breitner.de/
| >> | |   Jabber: nomeata at joachim-breitner.de  * GPG-Key: 0x4743206C
| >> | |   Debian Developer: nomeata at debian.org
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