7.8.1 plan

Austin Seipp austin at well-typed.com
Thu Apr 3 13:15:39 UTC 2014

Hi all,

One final update: I have found a workaround for the issue Mateusz
reported last week. Luckily it can be fought off somewhat easily for
now for OS X users, but there are more details here:

The final thing that ended up being a hold-up is now #8870 - the 32bit
Windows distribution is segfaulting. At first, I thought this was an
anomaly, but I saw several other people who also reported this
problem. After a bit of sweat I've finally reproduced this bug and
tracked this down part of the way, but I've been especially confused
by this issue because apparently it does not affect everyone! Which is
quite bizarre, as given the results I found, I'd suspect everyone to
see it.

Right now, Kyrill has suggested a fix I'm attempting (I slightly
botched my first try), and I have found a way to avoid it at the
moment by turning off optimization (which seems to reduce stack
pressure enough to get by on Windows - see the ticket for details).

Are there any Windows users who would be willing to test a 32bit
Windows binary distribution, should I make a provisional one? I can
have it up within a few hours from now. I'd really love some outside
confirmation of this problem and a resolution once we have it!

As this is the last bug, if I can at least get some confirmation a fix
works, I can have the final release out immediately afterwords - the
tree is otherwise quiet and will remain so.

On Tue, Mar 25, 2014 at 5:24 PM, Austin Seipp <austin at well-typed.com> wrote:
> Hello all,
> As an updated, I'm looking into the report Mateusz had of 'free'
> failing to build haddocks on OS X*, which I've reproduced. It seems
> nasty - I'll follow up with details ASAP.
> * See his recent email to ghc-devs about this problem.
> On Tue, Mar 25, 2014 at 12:11 PM, Mateusz Kowalczyk
> <fuuzetsu at fuuzetsu.co.uk> wrote:
>> On 25/03/14 17:09, kyra wrote:
>>> On 3/25/2014 20:52, Mateusz Kowalczyk wrote:
>>>> The only instances of Haddock becoming really slow that I can think of
>>>> is some rather old ticket (#101 on Haddock Trac) in presence of Template
>>>> Haskell but I have closed it a while ago due to lack of information to
>>>> go on and inability to replicate without the reporter's help. Perhaps
>>>> this was your use case?
>>> Aha, this is why I could not reproduce it! I checked it on packages
>>> which used no TH, and that slow behaviour occurred when TH was involved!
>>> I think it is TH which really triggers producing and splitting of an
>>> assembly output and in this case no-splitting gives *huge* benefit.
>>> Sadly, I have no time to check this right now.
>>> Regards,
>>> Kyra
>>> _______________________________________________
>>> ghc-devs mailing list
>>> ghc-devs at haskell.org
>>> http://www.haskell.org/mailman/listinfo/ghc-devs
>> There's no rush as it's not going to get into 7.8.1 anyway but I would
>> love to see some numbers before 7.8.2 so please keep us in mind.
>> Thanks!
>> --
>> Mateusz K.
>> _______________________________________________
>> ghc-devs mailing list
>> ghc-devs at haskell.org
>> http://www.haskell.org/mailman/listinfo/ghc-devs
> --
> Regards,
> Austin Seipp, Haskell Consultant
> Well-Typed LLP, http://www.well-typed.com/


Austin Seipp, Haskell Consultant
Well-Typed LLP, http://www.well-typed.com/

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