[Haskell-cafe] ghc -O2 out of memory

[Carter Schonwald]

there SHOULD be a 32bit 7.8.4 build available somewhere for windows, and if
not , thats a real problem! I'm gonna shift this thread to ghc-devs,
because that *should* get addressed

@ghc-devs, how can we help this user get ahold of a 32bit windows 7.8.4
build? (eg, why do we not have one available yet?)

-Carter

On Mon, Mar 9, 2015 at 4:13 AM, Kees Bleijenberg <K.Bleijenberg at lijbrandt.nl
> wrote:

> Thanks for your answer.
>
> I also use ghc to create 32 bits dll’s. 7.8.4 is 64 bits GHC and can’t
> create 32 bits dll’s (?). This means I have to install 7.8.3 and 7.8.4 on
> the same Windows machine. Is this possible?
>
>
>
> Kees
>
> *Van:* Carter Schonwald [mailto:carter.schonwald at gmail.com]
> *Verzonden:* zaterdag 7 maart 2015 20:02
> *Aan:* Kees Bleijenberg
> *Onderwerp:* Re: [Haskell-cafe] ghc -O2 out of memory
>
>
>
> Upgrade to ghc 7.8.4, theres some known bugs in O2 optimization that
> resulted in excessive memory usage that are fixed in 7.8.4
>
> You'll still have painful compilation times with a 30kloc module , but
> memory usage should be physically possible after the upgrade.
>
> On Mar 7, 2015 10:58 AM, "Kees Bleijenberg" <K.Bleijenberg at lijbrandt.nl>
> wrote:
>
> I’ve written a program that reads a Excel file, parses the contents and
> generates a haskell module. Every cell in the xls has it’s own function in
> the module. This worked fine.
>
> Now I have a bigger xls. The resulting module Xls.hs contains 30000 lines
> haskell code (without comment). I created a testprogram test.hs that
> calculates and prints one cell.
>
> I did ghc --make test.hs and everything works fine.  The generated
> execuatable is very slow.
>
> I did ghc --make –O2 test.hs. The compilations takes 15 minutes and aborts
> with   ‘ghc: out of memory’. I’am working on Win 7 64 bits , ghc version =
> 7.8.3.
>
>
>
> What can I do to fix this? I do need –O2. I found with smaller xls’s that
> optimization speeds up the executable dramatically.
>
> Before I start experimenting, does it help to split up the xls .hs in
> seperate  files? I.e. the cells that refer to other cells and cells that
> don’t refer to other cells. Or will I still get ‘out of memory’ because the
> optimization is global?
>
>
>
> Kees
>
>
>
>
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