On Tuesday 19 April 2005 00:40, Andrew Kar wrote:
> The real killer though was the readahead file. I dont know how the Fedora team
> messed this up but I dont use any auto updates scheme at all yet this file
> was FULL of the wrong version numbers of files and libraries making it
> practically redundant.
> Since I dont use Gnome and didnt want its libs and apps filling up space that
> linux could better utilise for KDE and my instant app-start gratification I
> populated the readahead rather crudely with dir listings off apps that
> started with 'k' the whole contents of /usr/lib/kde and any k* and libk*
> stuff from /usr/lib as well as any commom apps and libs that I use.
> The result of all the above after rebooting?
> A desktop at least 30-40% faster although subjectively it feels at least twice
> as fast and is certainly far more responsive than XP.
> For those worried about the concept of preloading, linux has always utilised
> almost ALL available memory rather than let it sit there going to waste. This
> merely forces linux to allocate it more how you want it in a more user
> efficient way rather than linux keeping it as a disk cache or whatever.
Do you realize that there are machines with 'only' 128Mb of RAM?
Do you seriously propose users _manually_ tweak readahead?
It's error-prone as your own post shows.
Linux can do better.
> These are the techniques windows has always used in order to achieve its
> responsiveness except windows goes even further to another method we should
> look at which is to watch how an app loads itself and its libraries and then
> restructure its on disk form for maximum load speed.
>
> Anyhow I hope this info is of use to some of you. If your distro does not have
> readahead I see no reason why it cant be added. Prelinking is another matter
> though as AFAIK both the linker tools and the kernel need to support it. It
> is actually part of a package called kernel utilities If I recall correctly.
> Note also that KDEINIT should be disabled and not used if using prelinking.
> Both Suse and Fedora take care of this with environment variables.
I'd rather go uclibc way. That is, by stopping bloat instead of accomodating it.
--
vda
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