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Date: Wed, 27 May 2015 16:09:55 +0300
From: Timo Teras <timo.teras@....fi>
To: Alexander Monakov <amonakov@...ras.ru>
Cc: musl@...ts.openwall.com
Subject: Re: Question re: dynamic linking in musl

On Wed, 27 May 2015 16:01:50 +0300 (MSK)
Alexander Monakov <amonakov@...ras.ru> wrote:

> On Wed, 27 May 2015, Alex Dowad wrote:
> > > Can you also provide exact figures?  For example your callgrind
> > > logs?  Or just
> > > 'time' statistics for executables that spend much time in the
> > > dynamic linker.
> > Callgrind data attached.
> 
> Oh.  The profile makes it evident that most of the libraries
> lack .gnu.hash, and the lookup is almost always using SysV lookup.
> With many dependencies SysV lookup is slower: in my testing with
> Clang/LLVM I got something like 420 ms (compared to 240 ms unpatched
> or 110 ms patched musl with .gnu.hash lookup).
> 
> I'm not familiar with Alpine.  Hopefully someone else can chime in
> whether .gnu.hash is deliberately disabled.

We have not touched, so we are using the gcc default. Which apparently
then is sysv only (bummer).

I wonder if it's better to have both, or gnu only?

/Timo

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