Using madvise for ld.so

[Luciano Montanaro]

On Tuesday 16 March 2004 14:16, Luciano Montanaro wrote:
> On Tuesday 16 March 2004 12:52, Lubos Lunak wrote:
> > On Tuesday 16 of March 2004 12:34, Michael Matz wrote:
> > > Hi,
> > >
> > > following up Lubos' hack in kdeinit and friends to use madvise to speed up
> > > loading DSOs and his observation that this better belongs inside ld.so I
> > > did so (thanks to Lubos for fixing a silly error in it).
> > >
> > > The patch is for glibc CVS.  With older glibc's the GLRO has to be
> > > replaced with GL, and the order of the fields in rtld.c has changed a bit.
> > > I'm sure you'll figure out.  Brings a bit of speed up, ask Lubos for
> > > details ;)
> > 
> >  I've build a RPM for SUSE 9.0, with the attached patch. The RPM is at 
> > http://ktown.kde.org/~seli/download/glibc-2.3.2-0.i586.rpm . The wrong 
> > revision number clearly shows that I'm a lame packager and this is at your 
> > own risk, and if it blows up your computer and fries your cat, it's your 
> > fault :). But I use this rpm right now, in fact. The source rpm was 2.3.2-92, 
> > as available in the FTP version.
> > 
> >  Could somebody give it a try and post some results? Michael says that he 
> > didn't get that high speedup as I did. Refer to the 'preloading of binaries' 
> > thread for details.
> > 
> 
> With standard glibc t takes ~15 seconds from kdm screen to the removal of the 
> splash screen. With the patched glibc it goes down to ~8.
> How does the patch affect memory-challenged machines, though?

Maybe I had been a little impatient to post my results. I probably saw caching effects...
Trying the patched and unpatched libraries, just after reboot, i obtain a 
startup time of ~18s. Does it need linux 2.6?

> 
> Luciano 
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