Increased memory usage with GHC 7.10.1

[Simon Peyton Jones]

Can you open a ticket, please? And put as much data as you can.  Using `-dshow-passes` (both for 7.10 and prior versions) and showing the output would be helpful.

Simon

From: Glasgow-haskell-users [mailto:glasgow-haskell-users-bounces at haskell.org] On Behalf Of Paolino
Sent: 01 May 2015 09:42
To: glasgow-haskell-users at haskell.org
Subject: Re: Increased memory usage with GHC 7.10.1

Hello, I'm using ghc 7.10.1 to compile OpenGLRaw which is now impossible with -O1 and -O2 due to "ghc : out of memory error" on a 4GB linux host. The file making memory explode is  Graphics.Rendering.OpenGL.Raw.Functions<https://hackage.haskell.org/package/OpenGLRaw-2.4.1.0/docs/src/Graphics-Rendering-OpenGL-Raw-Functions.html>. With -O0 it uses 600 MB.
The file is really huge, but I could compile it with prior versions of ghc.
Regards
paolino

2015-04-17 1:33 GMT+02:00 David Laing <dave.laing.80 at gmail.com<mailto:dave.laing.80 at gmail.com>>:
Hi all,
I've been playing around with profiling GHC recently, so I thought I'd chime in with a pointer that might save people searching for the right docs - you could configure a cabal sandbox to work with multiple version of ghc, which I've found useful:

https://www.haskell.org/cabal/users-guide/installing-packages.html#sandboxes-advanced-usage

Cheers,

Dave

On Fri, Apr 17, 2015 at 6:01 AM, Michal Terepeta <michal.terepeta at gmail.com<mailto:michal.terepeta at gmail.com>> wrote:
Hi Richard,

Thanks updating the ticket! What I did was: build GHC HEAD/7.8.4 with build flavor 'prof' then get the haskell-src-exts sources, install the dependencies and finally add +RTS -p -RTS to the cabal file and compile it, the resulting ghc.prof contains the profiling information.

For anyone interested about CallArity slowness, the problem is tracked in https://ghc.haskell.org/trac/ghc/ticket/10293

Cheers,
Michal

On Wed, Apr 15, 2015 at 1:40 AM Richard Eisenberg <eir at cis.upenn.edu<mailto:eir at cis.upenn.edu>> wrote:
I've pasted Michal's numbers in #9630, which seems like a good place to track this. Michal, would you mind fleshing out a bit precisely what you did to get those numbers? That would be helpful (though you've already been very helpful indeed in getting the data together)!

Thanks,
Richard

On Apr 14, 2015, at 9:09 PM, Joachim Breitner <mail at joachim-breitner.de<mailto:mail at joachim-breitner.de>> wrote:

> Hi,
>
> Am Dienstag, den 14.04.2015, 21:54 +0200 schrieb Michal Terepeta:
>> On Mon, Apr 13, 2015 at 10:34 PM, Christiaan Baaij
>> <christiaan.baaij at gmail.com<mailto:christiaan.baaij at gmail.com>> wrote:
>>> Actually, I meant only with -fno-specialise.
>>
>> Done. Helps quite a bit but CallArity is still a pretty expensive.
>
> I’m on that, and I think I have a quite neat fix for it. I’ll report on
> that in the trac ticket:
> https://ghc.haskell.org/trac/ghc/ticket/10293#comment:4
>
> Greetings,
> Joachim
>
> --
> Joachim “nomeata” Breitner
>  mail at joachim-breitner.de<mailto:mail at joachim-breitner.de> • http://www.joachim-breitner.de/
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