From mboxrd@z Thu Jan  1 00:00:00 1970
X-Msuck: nntp://news.gmane.org/gmane.linux.lib.musl.general/7789
Path: news.gmane.org!not-for-mail
From: Timo Teras <timo.teras@iki.fi>
Newsgroups: gmane.linux.lib.musl.general
Subject: Re: Question re: dynamic linking in musl
Date: Wed, 27 May 2015 16:09:55 +0300
Message-ID: <20150527160955.1bda26cf@vostro>
References: <20150527100844.GA306@alex-ThinkPad-L530>
	<alpine.LNX.2.11.1505271323270.19145@monopod.intra.ispras.ru>
	<5565A812.9090004@gmail.com>
	<alpine.LNX.2.11.1505271551280.19145@monopod.intra.ispras.ru>
Reply-To: musl@lists.openwall.com
NNTP-Posting-Host: plane.gmane.org
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
X-Trace: ger.gmane.org 1432732212 6099 80.91.229.3 (27 May 2015 13:10:12 GMT)
X-Complaints-To: usenet@ger.gmane.org
NNTP-Posting-Date: Wed, 27 May 2015 13:10:12 +0000 (UTC)
Cc: musl@lists.openwall.com
To: Alexander Monakov <amonakov@ispras.ru>
Original-X-From: musl-return-7801-gllmg-musl=m.gmane.org@lists.openwall.com Wed May 27 15:10:11 2015
Return-path: <musl-return-7801-gllmg-musl=m.gmane.org@lists.openwall.com>
Envelope-to: gllmg-musl@m.gmane.org
Original-Received: from mother.openwall.net ([195.42.179.200])
	by plane.gmane.org with smtp (Exim 4.69)
	(envelope-from <musl-return-7801-gllmg-musl=m.gmane.org@lists.openwall.com>)
	id 1Yxb63-0002Uo-JG
	for gllmg-musl@m.gmane.org; Wed, 27 May 2015 15:10:11 +0200
Original-Received: (qmail 30441 invoked by uid 550); 27 May 2015 13:10:09 -0000
Mailing-List: contact musl-help@lists.openwall.com; run by ezmlm
Precedence: bulk
List-Post: <mailto:musl@lists.openwall.com>
List-Help: <mailto:musl-help@lists.openwall.com>
List-Unsubscribe: <mailto:musl-unsubscribe@lists.openwall.com>
List-Subscribe: <mailto:musl-subscribe@lists.openwall.com>
Original-Received: (qmail 30419 invoked from network); 27 May 2015 13:10:08 -0000
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=gmail.com; s=20120113;
        h=sender:date:from:to:cc:subject:message-id:in-reply-to:references
         :mime-version:content-type:content-transfer-encoding;
        bh=wvyVZJuZU0aUVgpzQT+SbM/ZAKFLdrUaj6HoJLLS4yw=;
        b=SIE8VG7ktORVfIPfN2GCQ5fXgv389QDdxvvS0idyej/K/w0P6yRs08+oVrRABLL9L1
         o7KKVPULctlXACgPCpF7a0yvUfavVT09WbcLqgVQUsZrEW/TQ+/pi06Q1BmEihD/VzK8
         lW/6oH4xJ6sLoI0IBq5f6QooGutledkeF9R3HNKYzIqqHCIQUsEOvHomz7tFbABGamUx
         iRxqtkhKc/hDVRLv5bwOvgzd91fu5m9a/NRD+n/eyzodKXBAuxfesbVJrd2BQl/mpf08
         A3czw4QuGYIvBEyKJL/FtrRVkOLr5NQjV++cSTtk/puZVTBmPdQnZpLuRgtUqL8YNxMD
         9nkQ==
X-Received: by 10.152.3.33 with SMTP id 1mr27913021laz.109.1432732197414;
        Wed, 27 May 2015 06:09:57 -0700 (PDT)
Original-Sender: =?UTF-8?Q?Timo_Ter=C3=A4s?= <timo.teras@gmail.com>
In-Reply-To: <alpine.LNX.2.11.1505271551280.19145@monopod.intra.ispras.ru>
X-Mailer: Claws Mail 3.11.1 (GTK+ 2.24.25; x86_64-alpine-linux-musl)
Xref: news.gmane.org gmane.linux.lib.musl.general:7789
Archived-At: <http://permalink.gmane.org/gmane.linux.lib.musl.general/7789>

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