Help! Kernel_task using high percentage of CPU.

Hi guys,
I am using Macbook Pro with Retna. Recently my macbook started to slow down while making loud fan noise. I noticed that Kernel Task was using high percentage of CPU (aroung 600). This is not the first time. Last time I took it to apple store and got fix, but this time I can not do that because my warrenty expired.
I tried to fix it by formating the macbook, but it did not work.
Could anyone help me with this?!?

Do SMC reset. how u do it???????.... well connect the magsafe adapter to the mac, Shutdown the mac. Then Hold ctrl+opt+shift+power button for 6-8 sec. Leave all the keys and have a watch on the Magsafe, the amber should turn Green the moment u leave all the keys indicating a successfull Reset. Then unplug the magsafe wait fro 3 sec plug it again. Start the machine , still the issue is there then finally do a PRAM/NVRAM reset holding cmd+opt+p+r as u start the machine. Machine would chime Twicce on the 3rd chime leave all the keys. Even after this doesnot do good then battery reset is required for which u ll hav to take it to Apple service store.

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How to know which process is consuming high percentage of cpu?

Hi,
How to check which process is consuming high percentage of cpu ?
how to know the cpu time is atleast 80% of the elapsed time and how to know which code the process is running?
I know we can check high performance cpu can be find by TOP command
but i dont know on solaris?
please help me on this?

One way is to use my Snapper script for getting the breakdown ( see http://blog.tanelpoder.com/2007/12/06/oracle-session-snapper-v106-released/ for more info ).
An example snapshot (taken over 60 second period) is below:
SQL> @snapper out,gather=tw 60 1 "select sid from v$session where type = 'USER'"
-- Session Snapper v1.07 by Tanel Poder ( http://www.tanelpoder.com )
HEAD, SID, SNAPSHOT START , SECONDS, TYPE, STATISTIC , DELTA, DELTA/SEC, HDELTA, HDELTA/SEC
DATA, 2, 20080710 11:39:18, 61, TIME, repeated bind elapsed time , 1314, 22, 1.31ms, 21.54us
DATA, 2, 20080710 11:39:18, 61, TIME, parse time elapsed , 21518, 353, 21.52ms, 352.75us
DATA, 2, 20080710 11:39:18, 61, TIME, PL/SQL execution elapsed time , 809888, 13277, 809.89ms, 13.28ms
DATA, 2, 20080710 11:39:18, 61, TIME, DB CPU , 11204956, 183688, 11.2s, 183.69ms
DATA, 2, 20080710 11:39:18, 61, TIME, sql execute elapsed time , 12441308, 203956, 12.44s, 203.96ms
DATA, 2, 20080710 11:39:18, 61, TIME, DB time , 13825800, 226652, 13.83s, 226.65ms
DATA, 2, 20080710 11:39:18, 61, WAIT, read by other session , 4432, 73, 4.43ms, 72.66us
DATA, 2, 20080710 11:39:18, 61, WAIT, log file sync , 1215135, 19920, 1.22s, 19.92ms
DATA, 2, 20080710 11:39:18, 61, WAIT, db file sequential read , 1458168, 23904, 1.46s, 23.9ms
DATA, 2, 20080710 11:39:18, 61, WAIT, enq: TX - row lock contention , 11600, 190, 11.6ms, 190.16us
DATA, 2, 20080710 11:39:18, 61, WAIT, row cache lock , 420, 7, 420us, 6.89us
DATA, 2, 20080710 11:39:18, 61, WAIT, SQL*Net message to client , 1842, 30, 1.84ms, 30.2us
DATA, 2, 20080710 11:39:18, 61, WAIT, SQL*Net message from client , 9490531, 155582, 9.49s, 155.58ms
DATA, 2, 20080710 11:39:18, 61, WAIT, PL/SQL lock timer , 35759582, 586223, 35.76s, 586.22ms
DATA, 2, 20080710 11:39:18, 61, WAIT, events in waitclass Other , 302, 5, 302us, 4.95us
DATA, 20, 20080710 11:39:18, 61, TIME, repeated bind elapsed time , 1332, 22, 1.33ms, 21.84us
DATA, 20, 20080710 11:39:18, 61, TIME, parse time elapsed , 21439, 351, 21.44ms, 351.46us
DATA, 20, 20080710 11:39:18, 61, TIME, PL/SQL execution elapsed time , 799773, 13111, 799.77ms, 13.11ms
DATA, 20, 20080710 11:39:18, 61, TIME, DB CPU , 11303744, 185307, 11.3s, 185.31ms
DATA, 20, 20080710 11:39:18, 61, TIME, sql execute elapsed time , 12404247, 203348, 12.4s, 203.35ms
DATA, 20, 20080710 11:39:18, 61, TIME, DB time , 13792389, 226105, 13.79s, 226.1ms
DATA, 20, 20080710 11:39:18, 61, TIME, sequence load elapsed time , 752, 12, 752us, 12.33us
DATA, 20, 20080710 11:39:18, 61, WAIT, log file sync , 1228759, 20144, 1.23s, 20.14ms
DATA, 20, 20080710 11:39:18, 61, WAIT, db file sequential read , 1339772, 21963, 1.34s, 21.96ms
DATA, 20, 20080710 11:39:18, 61, WAIT, row cache lock , 395, 6, 395us, 6.48us
DATA, 20, 20080710 11:39:18, 61, WAIT, SQL*Net message to client , 1901, 31, 1.9ms, 31.16us
DATA, 20, 20080710 11:39:18, 61, WAIT, SQL*Net message from client , 9496607, 155682, 9.5s, 155.68ms
DATA, 20, 20080710 11:39:18, 61, WAIT, PL/SQL lock timer , 35786481, 586664, 35.79s, 586.66ms
DATA, 20, 20080710 11:39:18, 61, WAIT, events in waitclass Other , 96, 2, 96us, 1.57us
Tanel Poder
http://blog.tanelpoder.com

MacBook Air kernel_task using 130 to 150 % CPU overload with fan overheat

After hours and hours to get a diagnostic for this problem, I have solve it.
It seems to be a troubleshooting with the Apple ETHERNET to USB adapter used thru an USB Powered hub (A Kensington here)...
My configuration was:
MacBook Air 1.8Ghz SSD
Wireless BT Apple Keyboard (Aluminum) and Mouse
24" Apple Display (DVI)
USB USB Powered
iPod Classic 80 Go used by iTunes and Time Machine for Backups
__!! Apple Ethernet/USB Adapter !!__
Canon Pixma USB Printer
Overload CPU with kernel_task up to 150% was cycling.
That's the first reason of the difficulty to diagnose it.
Because the adapter was so hot I couldn't even touch it, I thought it was probably in charge of this mess.
Reading some forums, it's possible that there's multiple reasons for an overload CPU time by the kernel_task and this is one of these.
If you encounter messes with kernel_task using an Apple Ethernet/USB adapter, check it first to do anything else.
Hope to have help you...
Nick

it seems to be temperature issue, i.e. the system tries with the kernel task to avoid an overheating of the cpu/gpu. those guys here
- http://plasmadesign.wordpress.com/2008/04/02/macbook-air-core-shutdown/ (how-to)
- http://plasmadesign.wordpress.com/2008/08/23/apple-fix-macbook-air-core-shutdown -issue/ (update)
recommend a cpu undervolting to reduce this heating. they use CoolBook
- http://www.coolbook.se/CoolBook.html
you can get it for $10. i just installed it and hope that it helps...
on your own risk...

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http://support.apple.com/kb/ht1379?viewlocale=en_US
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See this: <br />
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Hello,
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ssls6 wrote:
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https://discussions.apple.com/message/23685234?tstart=0#23685234
Hope this helps you!!
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Help! Kernel_task using high percentage of CPU.

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