deer, list!
I currently try to minimize the application startup-time for my
gentoo-laptop.
Even with prelink it takes about one minute to start kde and all programs in
autostart due to the heavy disk i/o load.
In the last days I did some tests with taking a copy of my regular /usr
(ext3)
dir and storing it in a squashfs file. I then mount it as loopback device
on /usr. (Leaving the original copy still intact but hidden.)
Those are the effects I try to achieve:
1. The filesystem has no fragmentation at all. Files in my regular /usr dir
are somewhat fragmented, but not too badly.
2. It's compressed: less disk i/o and more cpu load.
So far the results have been promising. With the new squashfs I'm down to
around 50 secs (-16%). But at the moment my benchmark methods are quite
primitve. I simply have a stopwatch nearby and meassure the time from login
to when the disk is idle again. I'm looking forward to some input on this.
greets
Roman
Some things that I believe help with startup time are:
-Os and LDFLAGS="-Wl,-O1 -Wl,--hash-style=gnu -Wl,--as-needed"
In order to use the new --hash-styles, you need at least
=binutils-2.17.50.X, which is keyworded with -*
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