Re: Improve Startup-Speed for KDE!?

André Schneider wrote:
> Hi Michael,
> 
> michael schuster wrote:
>> hmm ... this is an interesting statement - in my experience, once you
>> know and use DTrace, a lot of issues can be resolved much more quickly
>> then without 
> 
> I'm interested in DTrace but I didn't used it before.
> 
> Please, could you give some hints. What I have to do?
> The goal is to observe a certain KDE application.
> 
> - Are there any changes at OS level necessary?
>   (reboot?)

no! that's the nice thing about DTrace: it comes with the OS *but* has 
no (none, nix, keinen) impact on the system as long as it's not 
activated ;-)

> - ... changes at application level ...?

not initially - you may want to add probe points at a later time once/if 
you've narrowed it down to something specific.

> - How can I start the observation process using DTrace?

example (prints a LOT of output! you may want to pipe this through 
less/more/pg):

# dtrace -n 'pid$target:libc::entry,pid$target:libc::return{}' -c 'ls'

-c takes exactly one string as an argument, so if your program uses 
options/args, enclose the whole thing in quotes, eg
	-c '~/bin/myprog one_arg two_arg'

(you'll need to run this as root or assign yourself the appropriate 
dtrace_* privileges).

subscribe to [email protected] (seriously - you can learn a 
lot by "hanging around")

Depending on the release of Solaris you're running, there may also be a 
few examples in /usr/demo/dtrace/

> - How can I see or postprocess the results?

see above. (it's just text ...)

I'm not familiar with the specific issues, so I can't go into more 
detail. I *strongly* recommend you download and read the DTrace guide 
from http://www.opensolaris.org/os/community/dtrace/ - it (and that 
page) is probably the best starting point.

HTH
Michael
-- 
Michael Schuster	Sun Microsystems, Inc.
recursion, n: see 'recursion'
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