Daen1543's Short Guide to Prelinking

[daen1543]

I'm absolutely 100% sure that all that's needed to correctly prelink your system is:

1) emerge prelink;
2) edit /etc/prelink.conf to check that what you want prelinked is there;
3) if you're using Nvidia drivers and Qt:
---> opengl-update xfree; or
---> USE="-opengl" emerge qt : this is my preferred choice;
4) prelink -amfR -nv : do a dry run - look for errors. On my system the only problematic libraries are from the libcap package. Any libraries or binaries depending on non-prelinkable libraries will not be prelinked;
5) prelink -amfR : this may take ~5 minutes and requires some free disk space.

Now, to check it's working:
6) LD_DEBUG=statistics konqueror & (or any other prelinked app). Look for "number of relocations: 0."

When you update any libraries or binaries, run prelink again with:
7) prelink -amR

I can't say this makes an obvious effect on my system (AMD1800+), but slower systems may benefit from this.

Does anyone know what effect disabling the opengl USE flag has on Qt? I haven't noticed any.

[sebsebseb]

well I followed your guidelines, and it worked perfectly for me... I had read somewhere else that with gcc optimization flags (like -O3 -pipe etc...), one could end with an unusable system.

i'm using gentoo 1.4rc4 on a Compaq Presario 1200 laptop. Here are the specs, and the results :

Compaq Presario 1200
Celeron 733 (Coppermine)
316 MB RAM
CyberBlade i1 gfx card
kernel 2.4.20-gaming-r3
GCC 3.2.3
libtool 1.4.3-r1
Qt 3.1.2-r4
KDE 3.1.4
prelink 20030811

i used "-march=pentium3 -O3 -pipe -fomit-frame-pointer -fforce-addr falign-functions=4 -fprefetch-loop-arrays" in /etc/make.conf

system boots up in 45s, with added 30s for KDE to come up. I'm not sure of the speed increase, but now KDE apps run really smooth.

i was really scared to blow my install (24h compilation, don't want to do that again ;o)) but it was well worth !

[GentooBox]

[MighMoS]

Um, that wouldn't do anything when you change it back to nvidia. Because if prelink detects a different version, it'll just link in the different version at runtime, nullifying the speed increase (or so I've heard). Also, if you use wine, I've heard "prelink -amfR --no-execshield" prevents some problems.
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