Re: prelink performance gains

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On Tue, 15 Oct 2013 20:24:06 +0200, Reindl Harald wrote:
> Am 15.10.2013 20:07, schrieb Jan Kratochvil:
> > This is a bug of update system it does not know if an updated service needs
> > restarting or not.
> 
> you can always point with your finger somewhere else
> the better way is solve the root cause

The root cause is really the update system.  Why should I look for what daemon
to restart by hand?  It should happen automatically, it is even a security
hole if nightly yum updates a daemon but its old version remains running.
IIRC it is some systemd feature in development but I cannot find it now.

You can always make your software development life more simple by giving up on
some useful feature.  That -O2 vs. -O0 build is a good comparison.


> > This is a known prelink Bug:
> > 	-y has false mismatches
> > 	https://bugzilla.redhat.com/show_bug.cgi?id=666143
> > 
> > Just the evil Fedora Bugs autoclose has already closed it but it is still
> > valid.  I have provided even a single line fix there.
> 
> you can always point with your finger somewhere else
> the better way is solve the root cause

You can always make your software development life more simple by giving up on
some useful feature.  That -O2 vs. -O0 build is a good comparison.


> >> there are people wich shut down or suspend machines when they are not in use
> >> how do you imagine the cronjob run while they are not in use for this
> >> *majority* of users?
> > 
> > These users really should uninstall prelink as they cannot use it
> 
> if the majority should uninstall something because they can't
> use it it must not be active in a default setup

If the majority of Fedora users then yes.  IMO Fedora is more used on servers
but I really do not know the user base.


> > BTW all my servers run 24x7
> 
> and *there* you do *not* need prelink because the theoretical gain
> in faster startup does *not matter*

It does matter, I run even large builds there, regression testing, besides
that even web server CGIs benefit from it.  "server" is a wide term.


> so, and now come on and list some *real* benefits,

Improved performance.


> take the wasted time into account

If you find software development of performance features a wasted time then
I see it really does not make sense to discuss it more.


> stop to defeat prelink in the default
> install and agree that it has to be removed from it

I do not say anything about prelink in the default install as I have no idea
what is the default Fedora user.  But it is a useful feature at least on
servers and 24x7 running workstations.


Jan
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