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From: Timo Teras <timo.teras@iki.fi>
To: Alexander Monakov <amonakov@ispras.ru>
Cc: musl@lists.openwall.com
Subject: Re: Question re: dynamic linking in musl
Date: Wed, 27 May 2015 16:09:55 +0300	[thread overview]
Message-ID: <20150527160955.1bda26cf@vostro> (raw)
In-Reply-To: <alpine.LNX.2.11.1505271551280.19145@monopod.intra.ispras.ru>

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


  reply	other threads:[~2015-05-27 13:09 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-05-27 10:08 Alex Dowad
2015-05-27 10:40 ` Alexander Monakov
2015-05-27 11:18   ` Alex Dowad
2015-05-27 13:01     ` Alexander Monakov
2015-05-27 13:09       ` Timo Teras [this message]
2015-05-27 13:15         ` Alex Dowad
2015-05-27 13:23           ` Timo Teras
2015-05-27 14:06             ` Szabolcs Nagy
2015-05-27 14:06             ` Rich Felker
2015-05-28 14:03               ` Natanael Copa
2015-05-27 13:06     ` Szabolcs Nagy

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