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List: kde-optimize
Subject: Re: comments on KDE performance tips
From: Roger Larsson <roger.larsson () norran ! net>
Date: 2003-01-17 7:28:24
[Download RAW message or body]
On Friday 17 January 2003 06:34, Andrew Morton wrote:
> Waldo Bastian <bastian@kde.org> wrote:
> >
> > I think it is possible to let the linker tell the kernel that the whole
thing
> > should be read, but that's a suboptimal solution in that you read a lot of
> > stuff you rather not read. The best solution is to read what you need in
one
> > go, and nothing of the stuff that you don't need. Such solution would mean
> > that you put all the stuff that you need (at startup) in one continguous
part
> > of your lib and then the (runtime) linker should tell the kernel that it
must
> > read all that in.
>
> The cost of reading all the blocks in a file is negligibly higher than
> reading (say) half of them.
>
> For example, this script:
>
> #!/bin/sh
> PROG=$(which $1)
> for lib in $(ldd $PROG | cut -d ' ' -f 3)
> do
> cat $lib > /dev/null
> done
> $*
>
> when used as
>
> ./launch.sh konqueror
>
> speeds up the initial launch of konqueror by maybe 2x (didn't bother
benching
> it too hard, but the difference is quite plain).
Not for me. It slows it down.
Maybe I have too little memory, or too much debug info in my files.
(full debug compiled)
But loading all small can be a great win... a little program that lists all
shared memory for all programs.
cat /proc/*/maps | sort --key=6 -u | sort -n --key=5 | awk
'BEGIN{limit=131072}
; {if ($5 > limit) {print total; limit *= 2}; total += $5; printf "% 7s %s %s
%s
%s\n", $5, $2, $3, $4, $6}; END{print total}'
My final lines read:
2535865 r-xp 00000000 03:07 /opt/qt-copy/plugins/imageformats/libqjpeg.so
2536861 r-xp 00000000 03:07 /opt/qt-copy/plugins/imageformats/libqmng.so
2747510 r-xp 00000000 03:07 /usr/lib/GL/libGL.so.1.3.mesasoft
2748112 r-xp 00000000 03:07 /opt/kdecvs/lib/kde3/plugins/styles/keramik.so
168685464
/RogerL
--
Roger Larsson
Skellefteċ
Sweden
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