[Haskell-cafe] What could possibly be the reason of new GC-related problems after upgrading from ghc-7.6 to ghc-7.8.3 ?

[Carter Schonwald]

Please share the code or a minimal repro of the problem or there is no way
to help
On Nov 18, 2014 9:48 AM, "ducis" <ducis_cn at 126.com> wrote:

> I have done heap profiling on 7.8 and identified several hot spots but
> returning to 7.6 requires pretty a lot of configuration and waiting. There
> are hotspots, but as I have mentioned the code is convoluted and I don't
> think anyone will be able to really understand the code snippets if I post
> them here. I'm mainly looking for general hints and heuristics about how
> the GC would behave differently when upgraded to 7.8.
>
>
>
>
>
> At 2014-11-18 22:24:25, "Carter Schonwald" <carter.schonwald at gmail.com>
> wrote:
>
> Have you done any heap profiling? Eg 7.6 vs 7.8 heap profiles?
> On Nov 18, 2014 8:45 AM, "ducis" <ducis_cn at 126.com> wrote:
>
>> Recently I revived one of my projects set aside a year ago. As I'm an
>> archlinux user, the ghc version has now inevitably become 7.8.3.
>> Unfortunatly, the program starts to somehow have very bad GC performance
>> (less than 50% productivity) . While I don't have the statistics of the
>> older versions I'm pretty sure the current version has become visually less
>> responsive. And if the user performs a series of actions in quick
>> succession, the heap is not garbage collected in time and overflows. If the
>> user performs the same actions with longer pauses then everything is fine.
>> The GC seems to have become more loose in 7.8.
>> There is quite a large underdocumented pile of code so I don't think
>> posting it here would help.  But can anyone give me a hint about what could
>> be the reason?
>>
>>
>>
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>
>
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