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List:       binutils
Subject:    Re: -Bdirect linking patch
From:       michael meeks <michael.meeks () novell ! com>
Date:       2005-11-10 17:32:57
Message-ID: 1131643977.857.23.camel () linux ! site
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On Fri, 2005-10-28 at 07:30 -0700, Ulrich Drepper wrote:
> michael meeks wrote:
> > 	So - I have an evily hackish prototype for glibc & binutils that gives
> > me a really nice speedup with relocation processing. It's inspired by
> > the Solaris -Bdirect feature of the same name, and is implemented in the
> > same way - by adding a section containing a 16bit word per .dynsym entry
> > with an index into the libraries DT_NEEDED table, built at library link
> > time.
> 
> Forget it, we have prelinking, which is much more efficient.

	Just wondered if you'd had some time to re-consider this. I had hoped
the 'gettimeofday' measurements across my calls to glibc 'dlopen' would
be slightly convincing; I re-did them with a more complete set of markup
the results are:

	Normal:   2.693, 2.721, 2.714		- Avg. 2.709 ~3 seconds
	-Bdirect: 0.675, 0.679, 0.682           - Avg: 0.679 ~1/2 second

	ie. this makes the work done by dlopen for OO.o a factor of ~4 faster;
and cuts the OO.o startup time in half.

	Is there any way you'll contemplate just discussing including this
feature in glibc ? and/or - are you aware of some better method that I
can persue instead ? [ prelinking is not useful here ].

	Thanks,

		Michael.

-- 
 michael.meeks@novell.com  <><, Pseudo Engineer, itinerant idiot

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