DNOTIFY support and some timing
c.esken at cityweb.de
Tue Mar 4 22:34:55 GMT 2003
Am Sonntag, 23. Februar 2003 22:56 schrieb Josef Weidendorfer:
> On Sunday 23 February 2003 15:07, Christian Esken wrote:
> > Hello,
> > is there a good reason not to compile in DNOTIFY support by default?
> > The code in kio/kio/kdirwatch.cpp already checks the kernel version.
> > I agree, that there should be a possibility do --disable-dnotify ,
> > but default should be enabled.
> I agree.
> > For example SuSE8.1 (ships Kernel 2.4.19 and KDE3.0) has
> > not compiled KDE with "--enable-dnotify".
> Hmm. That's not our problem, though.
> Doesn't SuSE use FAM with DNOTIFY? This way, KDE programs should never need
> to do polling at all...
> > AFAIK KDE3.0 already had dnotify support?!?
> > Remark: I came across this, while working on a list of tips on how to
> > use KDE3 on slow computers. On "low end" computers like mine
> > (PIII - 450Mhz, 128MB Ram) doing polling has MAJOR impact on
> > overall KDE performance. Application startup and overall resposiveness
> > is much better with DNOTIFY. I blame this on the continuous task
> > switching from and to kded.
> You may be right. What's the sustained activity of kded in top?
> OTOH, DNOTIFY has drawbacks, too: If you write a big file, for each "write"
> syscall a DNOTIFY real-time signal is sent to each process watching the
> Can you open konqueror in your HOME, and check the result of a
> "while(true) do echo >> $HOME/log; done" in top?
Yes I can.
Sorry for not answering not earlier, but I am in the progress of setting up
a new computer. Here's the results for the new system:
Athlon XP2220+ , SuSE8.1 with preinstalled KDE 3.0.3.
CPU states: 23.7% user, 76.2% system, 0.0% nice, 0.0% idle
20697 chris 25 0 1728 1728 1696 R 37.1 0.3 1:19 bash
1183 chris -51 0 5532 5524 4116 S 2.9 1.0 1:40 artsd
20703 root 15 0 972 972 756 R 0.1 0.1 0:00 top
Rest of the processes uses 0.0% CPU (No, I don't know why
37.1% + 2.9% + 0.1% = 100%). And I do not see any fam process,
probably I just "forgot" to install/setup/whatsover the fam subsystem.
But basically this means in plain SuSE8.1 there is no FAM in KDE.
I can give results for my old system (PIII-450, current CVS, DNOTIFY)
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