Increased memory usage with GHC 7.10.1

[Dan Doel]

You aren't the only one. The vector test suite also has these kind of
issues. In its case, it's hard for me to tell how big the code is, because
template haskell is being used to generate it. However, I don't think the
template haskell is what's using the additional performance, because the
test suite is compiled with both -O0 and -O2, and only the latter runs into
performance issues.

In vector's case, 7.6.3 compiles significantly faster than 7.8.4, which is
in turn significantly faster than 7.10.1. And memory usage follows the same
pattern (with -O2 at least). 7.6.3 uses ~400MB of memory, 7.8.4 1-2GB and
7.10.1 3-4GB (if I'm remembering correctly). And while I can build the
tests on 7.10 in around 5 minutes, travis times out building them after
around half an hour.

On Thu, Apr 2, 2015 at 8:47 AM, Jan Stolarek <jan.stolarek at p.lodz.pl> wrote:

> I will. But I was curious whether this is only me or is anyone else seeing
> similar behaviour. And
> what about performance comparisson between 7.8.4 and 7.10.1? Do we have
> any numbers?
>
> Janek
>
> Dnia czwartek, 2 kwietnia 2015, Richard Eisenberg napisał:
> > Post a bug report! :)
> >
> > On Apr 2, 2015, at 8:19 AM, Jan Stolarek <jan.stolarek at p.lodz.pl> wrote:
> > > An update frrom my second machine, this time with 4GB of RAM. Compiling
> > > Agda ran out of memory (again Agda.TypeChecking.Serialise module) and I
> > > had to kill the build. But once I restarted the build the module was
> > > compiled succesfully in a matter of minutes and using around 50% of
> > > memory. This looks like some kind of memory leak in GHC.
> > >
> > > Janek
> > >
> > > Dnia środa, 1 kwietnia 2015, Jan Stolarek napisał:
> > >> Forall hi,
> > >>
> > >> I just uprgaded both of my machines to use GHC 7.10.1. I keep
> sandboxed
> > >> installations of GHC and this means I had to rebuild Agda and Idris
> > >> because the binaries built with GHC 7.8.4 were stored inside
> deactivated
> > >> 7.8.4 sandbox. Sadly, I had problems building both Agda and Idris due
> to
> > >> GHC taking up all of available memory.
> > >>
> > >> With Idris the problematic module was Idris.ElabTerm (~2900LOC). The
> > >> interesting part of the story is that when I do a clean build of Idris
> > >> GHC consumes all of memory when compiling that module and I have to
> kill
> > >> the build. But when I restart the build after killing GHC the module
> is
> > >> compiled using a reasonable amount of memory and within reasonable
> time.
> > >>
> > >> With Agda the problematic module is Agda.TypeChecking.Serialise
> > >> (~2000LOC). The trick with killing the build and restarting it didn't
> > >> work in this case. I had to compile Agda with GHC 7.8.4 (which works
> > >> without problems though the mentioned module still requires a lot of
> > >> memory) and alter my setup so that Agda binary is not stored inside
> GHC
> > >> sandbox.
> > >>
> > >> I wonder if any of you came across similar issues with GHC 7.10.1? Do
> we
> > >> have any performance data that allows to compare memory usage and
> > >> performance of GHC 7.10.1 with previous stable releases?
> > >>
> > >> All of the above happened on 64bit Debian Wheezy with 2GB of RAM.
> > >>
> > >> Janek
> > >>
> > >> ---
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> > >> Lodz University of Technology
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>
> Treść tej wiadomości zawiera informacje przeznaczone tylko dla adresata.
> Jeżeli nie jesteście Państwo jej adresatem, bądź otrzymaliście ją przez
> pomyłkę
> prosimy o powiadomienie o tym nadawcy oraz trwałe jej usunięcie.
>
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> If you are not the intended recipient or if you have received this message
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