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<H1>[Mageia-dev] Anybody having high CPU by kded4 after upgrading to 4.6.90?</H1>
<B>Wolfgang Bornath</B>
<A HREF="mailto:mageia-dev%40mageia.org?Subject=Re%3A%20%5BMageia-dev%5D%20Anybody%20having%20high%20CPU%20by%20kded4%20after%20upgrading%0A%09to%204.6.90%3F&In-Reply-To=%3CCA%2Bh4nj6Dzrs8yS_KSpYnAanwsyPFdz%2BaPtZiNy0yoaYOEzXhFA%40mail.gmail.com%3E"
TITLE="[Mageia-dev] Anybody having high CPU by kded4 after upgrading to 4.6.90?">molch.b at googlemail.com
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<I>Sat Jul 2 09:45:15 CEST 2011</I>
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<PRE>2011/7/1 Christiaan Welvaart <<A HREF="https://www.mageia.org/mailman/listinfo/mageia-dev">cjw at daneel.dyndns.org</A>>:
><i> On Fri, 1 Jul 2011, Radu-Cristian FOTESCU wrote:
</I>><i>
</I>>><i> Now, it's tough to determine what exactly is making kded4 to eat the CPU.
</I>>><i> As I'm having a single core, I'm burned. At the same time, minor changes
</I>>><i> that are actually small improvements make me want to stay with 4.6.90, not
</I>>><i> to revert to 4.6.4....
</I>><i>
</I>><i> One way to figure that out is to attach gdb to it while it's running and
</I>><i> then print a backtrace. If you do that several times, you may break in the
</I>><i> code that's running a lot. But even if that works it is likely still not
</I>><i> easy to figure out what's going on.
</I>><i>
</I>><i> Other ways to get information would be to strace (or ltrace) this daemon to
</I>><i> get an idea what it's trying to do. But CPU usage by the application itself
</I>><i> cannot be seen this way.
</I>><i>
</I>><i> An easier way to start is to run iotop and check if kded4 is doing any I/O
</I>><i> related to this cpu usage.
</I>
Did that (after installing all updates up to 07:00 UTC), no signs of
any I/O activity other than the usual. Still, one of the 4 cores is on
full load. What strikes me here is:
- on a CPU with 1 core, this is fully loaded
- on a dual core CPU only 1 core is loaded
- on a quadcore CPU only 1 core is loaded.
So, whatever it is, it affects only one CPU core no matter how many
cores the CPU offers.
--
wobo
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