Re: Bug#415194: libextlib-ocaml-dev: No debugging information
On Mon, Apr 09, 2007 at 03:52:41PM +0200, Stefano Zacchiroli wrote:
> On Mon, Apr 09, 2007 at 03:12:48PM +0200, Sven Luther wrote:
> > This would strongly hint at a behaviour of always including the debug symbols
> > in libraries, and since the .cmo/.cma are in the -dev file anyway, this would
> > not impose a size penalty on the normal user at all.
> >
> > Do we have an idea of how much the size increase is ?
>
> I tested that on extlib, and I'm quite scared by the result:
>
> zack@aquarium:$ ls -l *deb
> -rw-r--r-- 1 zack zack 297300 2007-04-09 15:27 libextlib-ocaml-dev_1.5-6_i386.deb
> -rw-r--r-- 1 zack zack 529000 2007-04-09 15:34 libextlib-ocaml-dev_1.5-7_i386.deb
>
> As expected the changelog entry for -7 is:
>
> zack@aquarium:$ dpkg-parsechangelog | tail -2
> * compile objects with debugging information, patch from Ivan Jager
> (Closes: #415194)
>
> Some more details:
>
> zack@aquarium:$ dpkg --info *-6*.deb | grep -i size
> size 297300 bytes: control archive= 4908 bytes.
> Installed-Size: 1808
> zack@aquarium:$ dpkg --info *-7*.deb | grep -i size
> size 529000 bytes: control archive= 4907 bytes.
> Installed-Size: 2280
> zack@aquarium:$ dpkg-deb -x *-6*.deb no_debug/
> zack@aquarium:$ dpkg-deb -x *-7*.deb debug/
> zack@aquarium:$ du -sh no_debug/usr/lib/ocaml/3.09.2/extlib/
> 840K no_debug/usr/lib/ocaml/3.09.2/extlib/
> zack@aquarium:$ du -sh debug/usr/lib/ocaml/3.09.2/extlib/
> 1,3M debug/usr/lib/ocaml/3.09.2/extlib/
>
> About 50% more in the size of OCaml objects, that's *a lot*. IMO this is
> enough of an argument to give up the idea, and also to strip the
> standard library, but maybe we should ask for the opinions of the
> release managers / the cd team.
Well, it is a huge size increase, but how many libraries are affected ? What
is the size of all the ocaml bytecode libraries in the archive ? And if
you compare that to the -dbg versions of the C libraries, is it significant ?
I am still in favour of always including them, i was told some time ago by
someone close to the ftp-masters, that even the place gain of not rebuilding
coq for all non-native arches was a minor issue, so ...
Friendly,
Sven Luther
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