Prelink is a powerful application, it allows us to pre-link the libraries needed for a binary before using it. So instead of looking for which libraries the binary will need when we launch it, prelink will modify the binary addind a little descriptions of the libs it nees to run. This get rid of the search for shared libraries everytime we launch the binary, so it makes it faster.
Important: Everytime that you upgrade the libraries that are needed for the binaries, (for example glibc) you have to re-run prelink on the system.
This is a little optimization that we will thank when launching big applications like KDE (moreover, if you prelink your system KDE will not need to launch kdeinit, so it will also run faster). The little binaries are already pretty fast, so will not appreciate the difference.
Requirements: it is a must to have compiled the binaries with binutils-2.13.90.0.xx and gcc-3.2 or higher, and also have installed glibc-2.3.1-r2 or higher. The size of the binaries will be bigger with prelink, and to run the process you need enough free space on the hard disk.
Way to go:
# emerge prelink
Find config file at /etc/prelink.conf
# prelink -afmR
This is the common use of prelink, that will prelink ALL the binaries, and also will look if the binaries were already prelinked, and prelink them again if needed.
It is possible that you get some errors when running prelink, because some binaries can not be prelinked (the ones compressed with upx, for example).
blogged from here, http://forums.gentoo.org/viewtopic.php?t=231170
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