On 10/16/2013 01:24 AM, Thiago Macieira wrote:
On terça-feira, 15 de outubro de 2013 17:35:13, ?ukasz Stelmach wrote:
This is not madness. Before we had dynamic shared libraries we had
static shared libraries. No runtime linking required, everything is
done via table lookups. You can't delete interfaces from a static
shared library, so they make development slightly more difficult. They
are lots faster.
a.out? I may be too young to remember.
Yeah, that's pre-ELF. It's also before my day. My first Linux install still had
a.out support and libc.so.4, but that was only for compatibility.
ELF is a big beast, however. To speed up, I recommend prelinking libraries,
executables, using techniques like ELF symbol visibility, protected
visibility, -Bsymbolic, etc.
i'm not so sure on prelinking. it does have perf upsides, but comes with
downsides. namely ANY change of a shared lib (eg upgrade, security fix
etc.) requires re-running prelink on all binaries and other shred libs
that depend on it. this is costly and requires a lot of tracking. it
also negates the ability to keep md5/sha1 hashes of all files in a
"secure place" and compare against it to detect intrusion and hacking...
:( prelink is a bit of a faustian bargain... :)
See
http://www.macieira.org/blog/2012/01/sorry-state-of-dynamic-libraries-on-linux/
http://www.macieira.org/blog/2012/01/update-and-benchmark-on-the-dynamic-library-proposals/
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