Date: Fri, 25 May 2007 21:06:43 -0700 From: Garrett Cooper <youshi10@u.washington.edu> To: Michiel Boland <Michiel.Boland@internl.net> Cc: freebsd-current@freebsd.org Subject: Re: gcc memory consumption: amd64 v i386 Message-ID: <4657B253.7070001@u.washington.edu> In-Reply-To: <Pine.GSO.4.64.0705252135230.2140@neerbosch.nijmegen.internl.net> References: <Pine.GSO.4.64.0705252135230.2140@neerbosch.nijmegen.internl.net>
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Michiel Boland wrote:
> Hi. I noticed that compilation of xorg-server on i386 with the new gcc
> proceeds normally, whereas compilation on amd64 would crash because the
> compiler would consume all memory. The i386 and amd64 boxen have the
> same amount of RAM and swap, obviously. And they run, give or take a few
> hours, more or less same version of -CURRENT.
>
> So it appears that memory consumption of gcc on amd64 is significantly
> greater than on i386. To test this further I created a very simple C
> source file:-
>
> void n0() { }
> void n1() { }
> void n2() { }
> void n3() { }
> ...
> void n49998() { }
> void n49999() { }
>
> (i.e. a file with 50000 trivial function definitions.)
>
> I compiled this file with several optimization levels, and then got the
> following
>
> no optimization -O
> amd64 164M 445M
> i386 142M 247M
>
> I was wondering if anyone can make any sense out of this.
>
> Cheers
> Michiel
What are your CFLAGS and CXXFLAGS? What -O did you build with?
-Garrett
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