Kernel Task 350 % CPU usage...
Hey guys... ive a big problem with my macbook pro 13 eary 2011...
since yesterday evening its very very slow and my fans are allways at 100% fan speed...
my problem is that it start directly after the start...
i turn on my macbook and my fans go full power and my macbook is slown down...
what did i try..
smc reset by clicking (left) + alt+ctrl+shift and powerbutton... nothing happened...
reinstalled my mac osx 10.7 (needed 3 hours for installation)
do u have some tips for me? i dont know anymore...
in the first moment ive watched series and then ... fans full speed and slowing down...
The kernel is using excessive processor cycles. Below is a partial list of causes for this condition.
Throttling
When it gets high temperature readings from the hardware, or a low-voltage reading from the battery, the kernel may try to compensate by interrupting the processor(s) to slow them down and reduce power consumption. This condition can be due to a buildup of dust on the logic board, to high ambient temperature, to a worn-out or faulty battery, or to the malfunction of a cooling fan or sensor. Note that if the problem is caused by a sensor, there may be no actual overheating or undervoltage.
If the computer is portable, test with and without the AC adapter connected. If kernel_task hogs the processor only on battery power, the fault is in the battery or the logic board.
The Apple Hardware Test, though not very reliable, is sometimes able to detect a bad fan or sensor.
Installed software
User-installed software that includes a device driver or other kernel code may thrash the kernel. Some system-monitoring applications, such as "iStat," can also contribute to the problem. You can test for this possibility by completely disabling or removing the software according to the developer's instructions, or booting in safe mode. Note, however, that disabling a system modification without removing it or booting in safe mode may not be as easy as you think it is.
Corrupt NVRAM or SMC data
Sometimes the problem is cleared up by resetting the NVRAM or the SMC.
Peripherals
According to at least one report, connecting an external display to a MacBook Pro via a Thunderbolt-to-DVI adapter may cause this issue. I can't confirm.
Encryption
Transferring large amounts of data to or from an encrypted disk image or FileVault volume may put an extra load on the kernel. If both the source and the destination are encrypted, the load may be doubled. If you transfer data from an encrypted disk image on an encrypted partition to another such image on another encrypted partition, the load may be quadrupled.
This issue probably doesn't affect late-model Macs with an Intel i-series, recent Xeon, or later processor. Those processors support hardware-accelerated encryption. You can determine what kind of processor you have by selecting About This Mac from the Apple menu in the menu bar.
Similar Messages
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So I noticed my macbook pro (17" 2011, 16GB RAM) running slow, especially graphics. opened up the activity monitor, and lo and behold there is something using 283% of my CPU: kernel_task. Before I even ask how this is possible, what is kernel task, and could this be responsible for my sluggish machine?
I did notice a week ago that google chrome is allowing many pop up windows with messages trying to get me to download system checks and other nonsense... Not sure if this is related but that's annoying too.
Any ideas?
ThanksALso, restarting does nothing to alter this slow state it seems. Restarted twice with no improvement
-
File copy results in kernel task high CPU usage
Macbook Pro
MacBook Pro
Model Identifier: MacBookPro6,1
Processor Name: Intel Core i5
Processor Speed: 2.53 GHz
2010 year model.
Snow Leopard 10.6.7
Copying files over the network, or via external Firewire 800 harddrive invariably results in rather hight cpu utilization for kernel task process. The number are in the range of 15-20% in the Acivity Monitor. To compare, iMac 27", 2009, full speed FireWire bus file copy at 80 mb/sec makes only 2-3% kernel task CPU use. Why is Macbook pro so much worse? Is it due to chipset limitations, or what?Just now I have been copying some movie files over Gigabit local area network, the data received per second is up to 55 mb, and kernel task consumes 50% or more of CPU. The same task on iMac or on Windows based computer does not tax the CPU in any way, since it is handled properly by network adapter I suppose. So what is wrong with 2010 Macbook Pro?
-
How could i get the kernel and user cpu usage for each process
Hi all,
In order to monitor the system CPU usage, I would like write a script to gather the kernel and user CPU usage for each process, like the prstat or top does. As always missing the shortlived kernel usage, prstat or top cann't get the precise CPU usage. I checked with the dtrace syscall, proc and fbt provider, but don't get which one is useful.
Please provide your comments and suggestion.
Thanks in advmail2sleepy wrote:
As I've studied the "dtrace" for a while, and seems Sun gives a pretty high score on this new feature.....I do want to know whether there's some probe can work for it, like writing a "dtrace" version prstat.You can write a prstat without dtrace. Because that's just polling at specific intervals and reading some process structures from /proc. You could have dtrace fire a probe every 5 seconds and read the same thing, but it wouldn't really be using any features of dtrace. Trhying to write it "in dtrace" doesn't make much sense.
What you could do that would be harder via other methods is to fire a probe at process exit that displayed the process information including total CPU time. They could print exactly when processes exited. Doing that without dtrace would be very difficult.
Darren -
Kernel task 300% CPU and sleep problem
MacBook Air 13-inch, Early 2014, ПО OS X 10.9.5 (13F34)
The system seems overloaded, big delays on keyboard typing. Activity Monitor shows kernel_task consume 300-400% of CPU, but otherwise system does not look as overloaded - laptop is not hot
and fan silent.
Also there is problems with system wakeup. It is impossible to wakeup system after closing the lid for more then 20 seconds, it turns off.
I think you have to add battery info.
Информация о модели:
Серийный номер: D8641061KJ3F90KAU
Производитель: SMP
Имя устройства: bq20z451
Pack Lot Code: 0
PCB Lot Code: 0
Версия прошивки: 511
Версия аппаратного обеспечения: 000a
Версия батареи: 1200
Информация о заряде:
Оставшийся заряд (мА·ч): 7282
Полностью заряжен: Да
Идет зарядка: Нет
Полная емкость заряда (мА·ч): 7282
Информация о степени исправности:
Количество циклов перезарядки: 43
Состояние: Обычный
Установлен аккумулятор: Да
Ток (мА): 0
Напряжение (мВ): 8539In safe mode the problem does not go away. Actual overheating the computer does not have, it is cold. The problem is with the power on and without. All programs are not included in the basic package, I removed. I also tried to reinstall the OS with the protection of personal data. The problem exist. The problem may be due to high humidity? I live in Sri Lanka. And there is a problem with sleep mode.
"Also there is problems with system wakeup. It is impossible to wakeup system after closing the lid for more then 20 seconds, it turns off." -
I'm just wondering what's up with the RAM usage on my macbook. Right when I start up 500MB of RAM is being used (wired and active), 100MB of it being the kernel task. After a typical session of use, I close all programs and find that the RAM usage is about 800MB and the kernel task is using 250MB. Just wondering why the kernel task's RAM usage creeps up like that and doesn't go back down. It's just a little perplexing to have the same exact programs running and be down 300MB of free RAM.
I was having the same problem and looked into it, this may help:
http://discussions.apple.com/thread.jspa?messageID=11084568� -
Hi
Ever since the kernel update my CPU usage has its own will. Would it normally stay under 10%, does it now ad 20% while only moving a window around. (nothing else open) Scrolling up and down got me to 95%! (with firefox 1 tab open/nothing else open) And as you can imagine this is getting annoying. Is there a solution? Someone who could help me?
I have Openbox as a WM. No DE. /usr/bin/X -nolisten tcp uses almost always around 5% with tops to 40%.
The problem occurs with my Acer Extensa 5230.
Processor
Intel® Celeron® Processor 900
(1MB L2 cache, 2.20GHz, 800MHz FSB)
Chipset
Mobile Intel® GL40 Express
Any more information? Logs? Errorfiles?Hi Klaus1
I have several plug-ins by cfx and the slick volumes 4, 6 8 and 10. I can post a list of all of them if you like. Up to now they never made any trouble, but you'll never know...
The edit in the timeline is about 25 minutes long. But the project file contains captured dv-footage of about 2 hours, so that alone adds up to something like 26 GB. Then there are a few rendered effect-clips done with some of the plug-ins like stabilizing or color correction which also add to the 30 GB, as well as some audio-files (some music, my voice-over commentary). I emptied the trash several times while working on the movie. At this moment there are only a few MB of erased audio in it.
It all sounds a bit like this is an insanely huge and complex project, but as i said, i have done projects like this in imovie without the massive cpu-usage. I'd like to continue to use imovie, but if this problem keeps coming up with future projects, i might as well take the step and switch to Final Cut Express.
For now I will try your idea of exporting the movie as it is now and open it in a new project file.
Thanks for your help and input so far! -
A Projector with minimal CPU usage?
How do i make a Projector with minimal CPU usage?
Windows XP Pro SP3.
Director 11.5.
Using Windos Task Manager - CPU Usage History. I like to use less then 5%.www.director-online.com - Ending CPU Hogging in Director
http://www.director-online.com/buildArticle.php?id=1122
UIHelper.x32 - xtra UiHelper
*sleep int timeInMs -- make this process sleep a while
on idle
sleep 1
end -
Windows 2000 SP4, 1g RAM, Firefox 9.0.1
We keep IE6 and Firefox open simultaneously for 2 different mail accounts. Firefox was always much faster even with 3 or 4 tabs open, but for the past couple of weeks when trying to update a screen the CPU suddenly goes to 100% usage and of course nothing will move until the particular process is finished. Closing one or more tabs does not help. If I close Firefox completely with Task Manager CPU usage goes back down to nil. After restarting Firefox CPU usage may or may not go back up depending upon whether it tries to continue the previous task that was locking it up.
It did not do this with Firefox 3.6 but then again it didn't happen immediately after updating to 9.0.1 either.100% CPU usage occurred most often toward the end of the working day when busy trying to print on-line postage. We don't have any memory-consuming plugins but according to the knowledge base articles Firefox memory usage can gradually increase during the day even if you do nothing. It seems that may be the problem so we close and restart Firefox more often now as that usually fixes the problem. However, if we get stuck on a particular website update that causes the CPU to to go 100%, we can always start Firefox without previous tabs so the update will stop, or simply use a different browser until we have time to let the computer play games with itself.
So our workaround of restarting Firefox turns out to be the final solution (until we find something better - will post it if we do). Vic -
High CPU usage on MaxDb instance
Hello Everyone,
I have a system showing high load on the CPU :
top - 00:05:05 up 311 days, 13:03, 9 users, load average: 50.72, 127.39, 110.54
Tasks: 500 total, 1 running, 499 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.3%us, 0.3%sy, 0.0%ni, 64.8%id, 34.3%wa, 0.0%hi, 0.0%si, 0.3%st
Mem: 49160M total, 48507M used, 652M free, 149M buffers
Swap: 20479M total, 1940M used, 18539M free, 3548M cached
I checked everything and noticed shared memory error in the dbmsrv file
Can anyone let me know if the shared memory could be a cause in the high load?
Or do I need to do any other basic checks?
Any help would be appreciated
Below is the output of 'x_cons HPT show active :
ID UKT UNIX TASK APPL Current Timeout/ Region Wait
tid type pid state Priority cnt try item
T2 2 18679 Logwr Vector IO 9 124866639(r)
T68 12 18689 User 23028* LogIOwait(234) 1 0 68 784358517(r)
T71 13 18690 User 23710* Vwait 0 909589452(s)
T78 17 18694 User 3024* LogIOwait(234) 0 906420743(r)
T79 9 18686 User 27748* LogIOwait(234) 0 750068811(r)
T90 11 18688 User 28215* Vwait 0 845220668(r)
T95 8 18685 User 32328* LogIOwait(234) ! 0 804631101(r)
T114 16 18693 User 20711**Command wait no 0 888322907(r)
T117 13 18690 User 18944* LogIOwait(234) 0 909589452(s)
T120 13 18690 User 28175* Vwait 0 909589452(s)
T141 18 18695 User 5611* Vwait 0 890340046(s)
T149 9 18686 User 29715* Connect close 5 750068811(r)
T320 16 18693 User 20068* Vwait 0 888322907(r)
T369 9 18686 User 28212* LogIOwait(234) 0 750068811(r)
T370 10 18687 User 3699* LogIOwait(234) ! 0 745931359(s)
T378 11 18688 User 28206* Vwait 0 845220668(r)
T454 18 18695 User 27238* IO Wait (R) ! 0 51 890340046(s)
T456 10 18687 User 3129* LogIOwait(234) 0 745931359(s)
T457 9 18686 User 29232* LogIOwait(234) 0 750068811(r)
T461 18 18695 User 28223* IOWait(R)(041) 0 890340046(s)
T463 12 18689 User 28177* Vector IO 0 784358517(r)
T470 10 18687 User 11683* LogIOwait(234) 0 745931359(s)
T473 8 18685 User 16966* Vwait 0 804631101(r)
T482 13 18690 User 13975* LogIOwait(234) 0 909589452(s)
T489 16 18693 User 28232**Command wait no 0 51 888322907(r)
T497 11 18688 User 18937* Connect close 17 845220668(r)
T500 11 18688 User 28207* Enter ShareLck 0 SQL_SessionList 1 (w) 845220668(r)
T503 10 18687 User 30325* LogIOwait(234) 0 745931397(s)
T505 16 18693 User 28221**Command wait no 0 888322907(r)
T577 15 18692 User 1940* Connect close ! 17 898282814(r)
T582 11 18688 User 13480* LogIOwait(234) 0 845220668(r)
T585 18 18695 User 1560* LogIOwait(234) ! 0 890340051(s)
T590 18 18695 User 20116* LogIOwait(234) 0 890340051(s)
T594 9 18686 User 5409* LogIOwait(234) ! 0 750068816(s)
T624 9 18686 User 1225* Vwait 0 750068816(s)
T639 16 18693 User 28253* LogIOwait(234) 0 888322907(r)
T658 13 18690 User 3719* LogIOwait(234) 0 909589453(s)
T663 9 18686 User 28247* Vwait 0 750068816(s)
T687 16 18693 User 27614* LogIOwait(234) ! 0 888322907(r)
T715 12 18689 User 4077* Vwait 0 784358517(r)
T724 8 18685 User 23921* LogIOwait(234) 0 804631101(r)
T727 13 18690 User 31523* LogIOwait(234) 0 909589453(s)
T731 12 18689 User 28205* Vwait 0 784358517(r)
T745 18 18695 User 27608* LogIOwait(234) ! 0 890340051(s)
T748 9 18686 User 17691* Vwait 0 750068816(s)
T754 16 18693 User 11312**Command wait no 0 888322907(r)
T759 16 18693 User 1514**LogIOwait(234) 5 0 888322907(r)
T761 15 18692 User 27641* LogIOwait(234) ! 0 898282814(r)
T766 11 18688 User 3745* LogIOwait(234) 0 845220668(r)
T771 9 18686 User 23176* Vwait 0 750068816(s)
T777 9 18686 User 30883* Vwait 0 750068816(s)
T781 18 18695 User 22235* LogIOwait(234) ! 0 890340051(s)
T787 17 18694 User 5980* Connect close 5 906420743(r)
T790 8 18685 User 5420* LogIOwait(234) 0 804631101(r)
T813 17 18694 User 2476* LogIOwait(234) ! 0 906420743(r)
T823 14 18691 User 309**Enter ShareLck 7 0 SQL_SessionList 1 (w) 902276702(r)
T832 8 18685 User 20739* LogIOwait(234) 0 804631101(r)
T845 13 18690 User 24777* LogIOwait(234) 0 909589453(s)
T850 13 18690 User 30893* LogIOwait(234) 0 909589453(s)
T853 14 18691 User 28194* Vwait 0 902276702(r)
T858 8 18685 User 23512* LogIOwait(234) 0 804631101(r)
T861 14 18691 User 20739* Vwait 0 902276702(r)
T865 18 18695 User 23706* Vwait 0 890340052(s)
T868 12 18689 User 20733* LogIOwait(234) 0 784358517(r)
T874 11 18688 User 28239* LogIOwait(234) 0 845220668(r)
T888 18 18695 User 22080* IOWait(R)(041) 0 890340052(s)
T894 13 18690 User 12231* Enter ShareLck 0 SQL_SessionList 1 (w) 909589453(s)
T895 17 18694 User 2578* Vwait ! 0 906420767(s)
T944 16 18693 User 23704* LogIOwait(234) 0 888322916(r)
T951 10 18687 User 5932* Vwait 0 745931493(s)
T953 10 18687 User 28252* Vwait 0 745931493(s)
T961 14 18691 User 28154* Running 296 902276747(r)
T972 10 18687 User 23711* Vwait 0 745931493(s)
T975 16 18693 User 22238* LogIOwait(234) 0 888322916(r)
T980 11 18688 User 2907* Vwait 0 845220677(s)
T989 14 18691 User 23714* LogIOwait(234) 0 902276747(r)
T1009 13 18690 User 9270* LogIOwait(234) 0 909589459(s)
T1010 15 18692 User 6137* LogIOwait(234) 0 898282825(s)
T1023 10 18687 User 28180* LogIOwait(234) 0 745931493(s)
T1041 15 18692 User 16138* Vwait 0 898282825(s)
T1047 9 18686 User 28161* Vwait 0 750068824(s)
T1067 18 18695 User 28168* IOWait(R)(041) 0 890340099(s)
T1068 15 18692 User 12678* Vwait 0 898282825(s)
T1070 10 18687 User 18967* LogIOwait(234) ! 0 745931493(s)
T1084 9 18686 User 16135* LogIOwait(234) 0 750068824(s)
T1100 10 18687 User 11196* LogIOwait(234) 0 745931493(s)
T1114 13 18690 User 1972* Vwait 0 909589459(s)
T1134 15 18692 User 28225* Vwait 0 898282825(s)
T1138 13 18690 User 23709* Vwait 0 909589459(s)
T1163 13 18690 User 28200* IO Wait (R) 0 16 909589459(s)
T1166 8 18685 User 28188* LogIOwait(234) 0 804631119(s)
T1199 18 18695 User 22297* Vwait 0 890340099(s)
T1211 17 18694 User 31118* Vwait 0 906420767(s)
T1240 17 18694 User 12901* LogIOwait(234) 0 906420767(s)
T1265 9 18686 User 14086* LogIOwait(234) 0 750068824(s)
T1286 15 18692 User 28230* Vwait 0 898282825(s)
T1313 15 18692 User 28220* Vwait 0 898282825(s)
T1314 16 18693 User 14699* LogIOwait(234) 0 888322916(r)
T1316 15 18692 User 28155* LogIOwait(234) 0 898282825(s)
T1342 12 18689 User 28222* Vwait 0 784358541(s)
T1344 17 18694 User 1557* LogIOwait(234) ! 0 906420767(s)
T1365 18 18695 User 28234* Vwait 0 890340099(s)
T1370 17 18694 User 28236* Vwait 0 906420767(s)
T1376 12 18689 User 28158* Vwait 0 784358541(s)
T1378 11 18688 User 10397* Vwait 0 845220677(s)
T1384 8 18685 User 28245* Vwait 0 804631119(s)
T1420 14 18691 User 24592* Vwait 0 902276747(r)
T1440 11 18688 User 22960* LogIOwait(234) 0 845220677(s)
T1463 9 18686 User 28185* Vwait 0 750068824(s)
T1471 11 18688 User 27611* Vwait 0 845220677(s)
T1496 8 18685 User 31179* LogIOwait(234) 0 804631119(s)
T1501 12 18689 User 28973* LogIOwait(234) 0 784358541(s)
T1517 14 18691 User 23708* Vwait 0 902276747(r)
T1524 16 18693 User 28151* Vwait 0 888322916(r)
T1547 10 18687 User 28216* IO Wait (R) 0 5 745931493(s)
T1558 15 18692 User 15863* LogIOwait(234) 0 898282825(s)
T1593 12 18689 User 22513* Vwait 0 784358541(s)
T1597 12 18689 User 12902* Vwait 0 784358541(s)
T1601 9 18686 User 23173* LogIOwait(234) ! 0 750068824(s)
T1604 8 18685 User 31556* Vwait 0 804631119(s)
T1612 10 18687 User 1281* LogIOwait(234) ! 0 745931493(s)
T1646 14 18691 User 4260* Vwait 0 902276747(r)
T1649 10 18687 User 23862* Vwait 0 745931493(s)
T1664 8 18685 User 32197* Vwait 0 804631119(s)
T1666 16 18693 User 23735* LogIOwait(234) 0 888322916(r)
T1676 12 18689 User 15167* Vwait 0 784358541(s)
T1680 18 18695 User 22282* Vwait 0 890340099(s)
T1683 9 18686 User 3034* LogIOwait(234) 0 750068824(s)
T1686 9 18686 User 23364* Vwait 0 750068824(s)
T1696 17 18694 User 28244* Vector IO 0 906420767(s)
T1709 14 18691 User 15351* Vwait 0 902276747(r)
T1733 18 18695 User 30535* IOWait(R)(041) 0 890340099(s)
T1735 11 18688 User 28179* LogIOwait(234) 0 845220677(s)
T1738 18 18695 User 22187* LogIOwait(234) 0 890340099(s)
T1740 14 18691 User 28160* Vwait 0 902276747(r)
T1779 16 18693 User 22606* Vwait 0 888322916(r)
T1843 12 18689 User 28224* Vwait 0 784358541(s)
T1849 15 18692 User 23707* LogIOwait(234) 0 898282825(s)
T1859 10 18687 User 28197* IOWait(R)(041) 0 745931493(s)
T1874 16 18693 User 28951* Vwait 0 888322916(r)
T1887 9 18686 User 29220* LogIOwait(234) ! 0 750068824(s)
T1913 15 18692 User 5598* Vwait 0 898282825(s)
T1918 9 18686 User 9654* Vwait 0 750068824(s)
T1924 17 18694 User 24524* Vwait 0 906420767(s)
T1950 8 18685 User 16727* LogIOwait(234) 0 804631119(s)
T1953 12 18689 User 10400* Vwait 0 784358541(s)
T1964 8 18685 User 23729* LogIOwait(234) 0 804631119(s)
T1967 18 18695 User 31693* Vwait 0 890340099(s)
T1992 16 18693 User 28184* Vwait 0 888322916(r)
T1998 16 18693 User 5737* Vwait 0 888322916(r)
T2003 14 18691 User 28204* Vwait 0 902276747(r)
T2008 9 18686 User 28240* LogIOwait(234) 0 750068824(s)
T2012 10 18687 User 28241* Vwait 0 745931493(s)
T2014 14 18691 User 20680* Vwait 0 902276747(r)
T2018 4 18681 PrefLOB Vector IO 0 325778572(s)
T2019 4 18681 PrefLOB Vector IO 0 325778572(s)
T2221 4 18681 Savepnt IO Wait (W) 0 14 325778572(s)
T2222 4 18681 AutoLgW Vsuspend (204) 0 325778572(s)
T2223 4 18681 AutoLgR Vector IO 0 325778572(s)
Regards,
VinayHi Vinay,
the x_cons output does not show any user tasks with CPU usage. There are all in some kind of wait situation. It really looks strange.
We have a lot of User Tasks in status VWAIT ->
T2014 14 18691 User 20680* Vwait 0 902276747(r)
-> vwait means that the Task requested a SQL lock but could not get this lock because it ia already locked by another task. The task has to wait -> Please check the SDQL LockSituation.
Then I see a lot of Tasks in LOGIOWAIT
T1166 8 18685 User 28188* LogIOwait(234) 0 804631119(s)
There are as well in a wait situation - write Log to disk - the reason for the suspent is no: 234
If you run x_cvons show supend you will get a list of Wiat situations ->
Which string do you get for 234
We see as well that you already tried to cancel or kill some of the Tasks -> see the '!'
T895 17 18694 User 2578* Vwait ! 0 906420767(s)
We have also read wait situation on the log - looks like a rollback is curerntly active as well.
If this is a SAP system I would recommend to open a SAP ticket to check the system directly.
Regards, Christiane -
Kernel Task over 400% CPU usage
Hello, I have some questions about the Kernel Task in my activity monitor.
Recently, after a hard disk failure, I have my Macbook Pro wiped and start afresh with Mavericks. All was well, but it slowed down tremendously in the last couple of days. I checked the activity monitor and Kernel Task is always around 400-470%, sometimes it even peaked to 1000+%! I closed all my applications but it is still taking up all my RAM. I cannot work when it is freezing up every 2 seconds. What is the problem?
Here is the report, if it helps:
EtreCheck version: 1.9.12 (48)
Report generated 3 August 2014 12:38:14 BST
Hardware Information:
MacBook Pro (13-inch, Early 2011) (Verified)
MacBook Pro - model: MacBookPro8,1
1 2.7 GHz Intel Core i7 CPU: 2 cores
4 GB RAM
Video Information:
Intel HD Graphics 3000 - VRAM: 384 MB
Color LCD 1280 x 800
System Software:
OS X 10.9.4 (13E28) - Uptime: 1 day 8:2:57
Disk Information:
WDC WD5000LPVX-00V0TT0 disk0 : (500.11 GB)
EFI (disk0s1) <not mounted>: 209.7 MB
Macintosh HD (disk0s2) / [Startup]: 499.25 GB (121.06 GB free)
Recovery HD (disk0s3) <not mounted>: 650 MB
HL-DT-ST DVDRW GS31N
USB Information:
Apple Computer, Inc. IR Receiver
Apple Inc. FaceTime HD Camera (Built-in)
Apple Inc. Apple Internal Keyboard / Trackpad
Apple Inc. BRCM2070 Hub
Apple Inc. Bluetooth USB Host Controller
Thunderbolt Information:
Apple Inc. thunderbolt_bus
Gatekeeper:
Anywhere
Kernel Extensions:
[not loaded] com.m-audio.driver.firewire.dice (2.4.2 - SDK 10.6) Support
Launch Daemons:
[loaded] com.adobe.fpsaud.plist Support
Launch Agents:
[running] com.maudio.profire.helper.plist Support
User Launch Agents:
[loaded] com.google.keystone.agent.plist Support
User Login Items:
iTunesHelper
Google Drive
Internet Plug-ins:
FlashPlayer-10.6: Version: 14.0.0.145 - SDK 10.6 Support
Flash Player: Version: 14.0.0.145 - SDK 10.6 Support
QuickTime Plugin: Version: 7.7.3
JavaAppletPlugin: Version: 14.9.0 - SDK 10.7 Check version
Default Browser: Version: 537 - SDK 10.9
Safari Extensions:
Searchme: Version: 1.3
Audio Plug-ins:
BluetoothAudioPlugIn: Version: 1.0 - SDK 10.9
AirPlay: Version: 2.0 - SDK 10.9
AppleAVBAudio: Version: 203.2 - SDK 10.9
iSightAudio: Version: 7.7.3 - SDK 10.9
iTunes Plug-ins:
Quartz Composer Visualizer: Version: 1.4 - SDK 10.9
3rd Party Preference Panes:
Flash Player Support
PreferencesPane Support
Time Machine:
Time Machine not configured!
Top Processes by CPU:
11% Disk Utility
11% repair_packages
7% helpd
5% WindowServer
3% hidd
Top Processes by Memory:
233 MB Finder
66 MB mds_stores
49 MB WindowServer
37 MB mds
34 MB Disk Utility
Virtual Memory Information:
1.22 GB Free RAM
1.35 GB Active RAM
394 MB Inactive RAM
1017 MB Wired RAM
1.50 GB Page-ins
100 MB Page-outsThe kernel is using excessive processor cycles. Below are some possible causes for the condition.
Throttling
When it gets high temperature readings from the hardware, or a low-voltage reading from the battery, the kernel may try to compensate by interrupting the processor(s) to slow them down and reduce power consumption. This condition can be due to:
☞ a buildup of dust on the logic board
☞ high ambient temperature
☞ a worn-out or faulty battery in a portable
☞ the malfunction of a cooling fan, a temperature sensor, a voltage sensor, or some other internal component
Note that if the problem is caused by a sensor, there may be no actual overheating or undervoltage.
If the computer is portable, test with and without the AC adapter connected. If kernel_task hogs the processor only on battery power, the fault is in the battery or the logic board. If it happens only on AC power, charging is causing the machine to heat up. That may be normal on some models. CPU usage should drop when charging is complete.
Apple Diagnostics or the Apple Hardware Test, though not very reliable, is sometimes able to detect a fault. For more thorough hardware testing, make a "Genius" appointment at an Apple Store, or go to another authorized service provider.
If nothing is wrong with the hardware, then whatever you can do to improve cooling may help.
Installed software
User-installed software that includes a device driver or other kernel code may thrash the kernel. That category includes virtualization software, such as Parallels and VMware, as well as most commercial "anti-virus" products. Some system-monitoring applications, such as "iStat," can also contribute to the problem. You can test for this possibility by completely disabling or removing the software according to the developer's instructions, or starting in safe mode. Note, however, that disabling a system modification without removing it or testing in safe mode may not be as easy as you think.
Corrupt NVRAM or SMC data
Sometimes the problem is cleared up by resetting the NVRAM or the SMC.
External display
Connecting an external LCD display to some MacBook Pro models while the lid is open may cause this issue. If applicable, test by closing the lid or disconnecting the display. You might get better results with a newer LED display. -
Kernel task is hogging lots of threads and CPU time
My Mavericks Quad Macbook Pro is getting pretty slow these days and at some point I'll have to reinstall everything I think. However I can't start that for a while as I have important projects on the go. I looked in Activity Monitor first and I can see a kernel task constantly running with no indication of what it is doing. So I opened Console and looked at the Diagnostic log. I can see a lot of lines referring to com.apple.message. Hundreds of identical lines actually. I did not have Messages running so I opened it, and sure enough that showed up in console live. However the log shows a slightly different app and a totally different UUID, which seems odd.
Anybody understand what this is all about? See below. I opened one of the endlessly repeating items plus one that I know is from the Messages app below it.
23/03/2015 08:28:29.242 UserEventAgent[235]: com.apple.message.domain: com.apple.usage.app_activetime
com.apple.message.signature: universalAccessAuthWarn
com.apple.message.signature2: com.apple.accessibility.universalAccessAuthWarn ||| 1.0 (190.1)
com.apple.message.value: 633
com.apple.message.value2: 0
com.apple.message.value3: 0
com.apple.message.value4: 0
com.apple.message.value5: 0
com.apple.message.value6: 0
com.apple.message.value7: 0
com.apple.message.result: NO
com.apple.message.summarize: YES
Sender_Mach_UUID: 55428B1C-9198-32BF-80EA-4731081F402E
23/03/2015 08:44:17.426 Messages[8722]: com.apple.message.domain: com.apple.iChat.app.weeklyStats
com.apple.message.video_chat_passed: 0
com.apple.message.video_chat_failed: 0
com.apple.message.video_chat_noop: 0
com.apple.message.audio_chat_passed: 0
com.apple.message.audio_chat_failed: 0
com.apple.message.audio_chat_noop: 0
com.apple.message.screen_sharing_passed: 0
com.apple.message.screen_sharing_failed: 0
com.apple.message.screen_sharing_noop: 0
com.apple.message.average_message_length: 0.000000
com.apple.message.messages_sent: 0
com.apple.message.messages_received: 0
com.apple.message.sms_sent: 0
com.apple.message.sms_menu_used: User never selected SMS menu
com.apple.message.result: pass
com.apple.message.imessage_offered_upgrades: 0
com.apple.message.imessage_upgrades: 0
com.apple.message.imessage_declines: 0
com.apple.message.imessages_sent: 0
com.apple.message.imessages_received: 0
Sender_Mach_UUID: 212E34A8-B310-3729-8D11-879E9985A0BD
23/03/2015 08:44:17.427 Messages[8722]: com.apple.message.domain: com.apple.iChat.app.servicesUsedThisWeek
com.apple.message.aim: 0
com.apple.message.bonjour: 0
com.apple.message.yahoo: 0
com.apple.message.jabber: 0
com.apple.message.google_talk: 0
com.apple.message.imessage: 1
com.apple.message.other: 0
com.apple.message.result: pass
Sender_Mach_UUID: 212E34A8-B310-3729-8D11-879E9985A0BD
23/03/2015 08:44:32.607 Messages[8722]: com.apple.message.domain: com.apple.iChat.app.prefs
com.apple.message.one_on_one_style: com.apple.iChat.Styles.Balloons-ShowPictures
com.apple.message.group_style: com.apple.iChat.Styles.Balloons-ShowPictures
com.apple.message.incoming_bg_color: Automatic
com.apple.message.outgoing_bg_color: Automatic
com.apple.message.incoming_font: Default 12.000000
com.apple.message.outgoing_font: Default 12.000000
com.apple.message.save_history: Don't Save
Sender_Mach_UUID: 212E34A8-B310-3729-8D11-879E9985A0BDThe kernel_task is the heart of the operating system. It will have on the order of a 100 threads (more or less). So when you ask the operating system to do something, like read/write a disk, do network I/O, talk to your mouse/trackpad, keyboard, monitor, etc... kernel_task is the code that is going to do that at the lowest levels.
Also if you have installed any 3rd party drivers (kernel extensions), they are going to become part of kernel_task and the CPU time they use will be part of kernel_task.
If you have anti-malware, Mac cleaner or memory cleaner software installed, many of these packages install drivers that then try to out-guess the kernel_task and often result in slowing down the system, interfering with the normal operation of the system, or causing kernel panics. These kinds of packages are not recommended by long term forum contributors.
Please provide the output from EtreCheck, which will show the 3rd party additions you have installed.
<https://discussions.apple.com/docs/DOC-6174> -
My kernel task is using 400% of my CPU
My coMputer is very slow, i need help. I saw the kernel task and is using yhe 400% of my CPU.
Hardware Information:
MacBook Pro (13-inch, Mid 2012)
MacBook Pro - model: MacBookPro9,2
1 2.5 GHz Intel Core i5 CPU: 2 cores
4 GB RAM
Video Information:
Intel HD Graphics 4000 - VRAM: 1024 MB
System Software:
OS X 10.9.2 (13C64) - Uptime: 0 days 0:5:35
Disk Information:
APPLE HDD HTS547550A9E384 disk0 : (500.11 GB)
EFI (disk0s1) <not mounted>: 209.7 MB
MacBokk Pro CJ4LV4R3z (disk0s2) / [Startup]: 499.25 GB (473.36 GB free)
Recovery HD (disk0s3) <not mounted>: 650 MB
MATSHITADVD-R UJ-8A8
USB Information:
Apple Computer, Inc. IR Receiver
Apple Inc. BRCM20702 Hub
Apple Inc. Bluetooth USB Host Controller
Apple Inc. Apple Internal Keyboard / Trackpad
Apple Inc. FaceTime HD Camera (Built-in)
FireWire Information:
Thunderbolt Information:
Apple Inc. thunderbolt_bus
Launch Daemons:
[System] com.adobe.fpsaud.plist 3rd-Party support link
User Login Items:
iTunesHelper
Internet Plug-ins:
FlashPlayer-10.6: Version: 12.0.0.77 - SDK 10.6 3rd-Party support link
Flash Player: Version: 12.0.0.77 - SDK 10.6 3rd-Party support link
QuickTime Plugin: Version: 7.7.3
Default Browser: Version: 537 - SDK 10.9
Audio Plug-ins:
BluetoothAudioPlugIn: Version: 1.0 - SDK 10.9
AirPlay: Version: 2.0 - SDK 10.9
AppleAVBAudio: Version: 203.2 - SDK 10.9
iSightAudio: Version: 7.7.3 - SDK 10.9
iTunes Plug-ins:
Quartz Composer Visualizer: Version: 1.4 - SDK 10.9
3rd Party Preference Panes:
Flash Player 3rd-Party support link
Old Applications:
None
Time Machine:
Time Machine not configured!
Top Processes by CPU:
18% com.apple.WebKit.Networking
13% syncdefaultsd
7% WindowServer
5% com.apple.WebKit.WebContent
4% mdworker
Top Processes by Memory:
98 MB Safari
94 MB com.apple.WebKit.WebContent
33 MB Dock
33 MB WindowServer
29 MB EtreCheck
Virtual Memory Information:
2.47 GB Free RAM
890 MB Active RAM
130 MB Inactive RAM
543 MB Wired RAM
191 MB Page-ins
0 B Page-outsThe kernel is using excessive processor cycles. Below are some possible causes for the condition.
Throttling
When it gets high temperature readings from the hardware, or a low-voltage reading from the battery, the kernel may try to compensate by interrupting the processor(s) to slow them down and reduce power consumption. This condition can be due to
a buildup of dust on the logic board
high ambient temperature
a worn-out or faulty battery in a portable
the malfunction of a cooling fan, a temperature sensor, a voltage sensor, or some other internal component
Note that if the problem is caused by a sensor, there may be no actual overheating or undervoltage.
If the computer is portable, test with and without the AC adapter connected. If kernel_task hogs the processor only on battery power, the fault is in the battery or the logic board. If it happens only on AC power, charging is causing the machine to heat up. That may be normal on some models. CPU usage should drop when charging is complete.
Apple Diagnostics or the Apple Hardware Test, though not very reliable, is sometimes able to detect a fault. For more thorough hardware testing, make a "Genius" appointment at an Apple Store, or go to another authorized service provider.
If nothing is wrong with the hardware, then whatever you can do to improve cooling may help.
Installed software
User-installed software that includes a device driver or other kernel code may thrash the kernel. That category includes virtualization software, such as Parallels and VMware, as well as most commercial "anti-virus" products. Some system-monitoring applications, such as "iStat," can also contribute to the problem. You can test for this possibility by completely disabling or removing the software according to the developer's instructions, or starting in safe mode. Note, however, that disabling a system modification without removing it or testing in safe mode may not be as easy as you think.
Corrupt NVRAM or SMC data
Sometimes the problem is cleared up by resetting the NVRAM or the SMC.
External display
Connecting an external LCD display to some MacBook Pro models may cause this issue. If applicable, test by disconnecting the display. You might get better results with a newer LED display. -
Kernel.task using 300% of CPU. MacBookAir mid 2013
Hi
I have a MacBookAir mid 2013, 13-inch.
Starting my mac up after sleep to weeks ago, it behaved very strange and has done it since that day. The fan turns on at full speed, and the Kernel.task operation is taking up 300% of the CPU, or in other words the system is constantly using between 65 - 80 % of the memory, hereby making the Mac very slow, and useless to use for anything. Also at the same time the sound disappeared, in the system configuration there is no output audio to select.
I have tried a lot of things in order to fix this problem, based on things I found in the discussion forum here. I have tried memory cleaner, to remove sound files, to remove plists (as many suggests, but for this MacBookAir6,2.plist, does not exist), I have formatted my hard disk and reinstalled the original OS X system (Mountain Lion), and the upgraded to the current version (Yosimite). But nothing has worked.
Does anyone having the same problem? Or know how to fix this? Anyone been in contact with Apple related to this problem?
Best regards
MortenFirst, get rid of "Memory Cleaner," which is useless at best. Then see below.
The kernel is using excessive processor cycles. Below are some possible causes for the condition.
Throttling
When it gets high temperature readings from the hardware, or low voltage readings from the battery of a MacBook, the kernel may try to compensate by interrupting the processor(s) to slow them down and reduce power consumption. This condition can be due to:
☞ a buildup of dust on the logic board
☞ high ambient temperature
☞ a worn-out or faulty battery in a portable
☞ the malfunction of a cooling fan, a temperature sensor, a voltage sensor, or some other internal component
Note that if the problem is caused by a sensor, there may be no actual overheating or undervoltage.
If the computer is portable, test with and without the AC adapter connected. If kernel_task hogs the processor only on AC power, charging is causing the machine to heat up. That behavior may be normal for some models. CPU usage should drop when charging is complete.
Apple Diagnostics or the Apple Hardware Test, though not very reliable, is sometimes able to detect a fault. For more thorough hardware testing, make a "Genius" appointment at an Apple Store, or go to another authorized service provider.
If nothing is wrong with the hardware, then whatever you can do to improve cooling may help.
Installed software
User-installed software that includes a device driver or other kernel code may thrash the kernel. That category includes virtualization software, such as Parallels and VMware, as well as most commercial "anti-virus" products. Some system-monitoring applications, such as "iStat," can also contribute to the problem. You can test for this possibility by completely disabling or removing the software according to the developer's instructions, or starting in safe mode. Note, however, that disabling a system modification without removing it or testing in safe mode may not be as easy as you think.
Corrupt NVRAM or SMC data
Sometimes the problem is cleared up by resetting the NVRAM or the SMC.
External display
Connecting an external LCD display to some MacBook Pro models while the lid is open may cause this issue. If applicable, test by closing the lid or disconnecting the display. You might get better results with a newer LED display. -
Anormal cpu usage with kernel 2.6.17
Hi,
After upgrading my kernel, i noticed a strange cpu usage.
Outpout of top :
top - 13:34:40 up 34 min, 3 users, load average: 0.00, 0.00, 0.01
Tasks: 85 total, 1 running, 83 sleeping, 1 stopped, 0 zombie
Cpu(s): 0.0%us, 0.3%sy, 0.0%ni, 87.7%id, 0.0%wa, 0.3%hi, 11.6%si, 0.0%st
why 11.6 %si, i nerver see that before the last upgrade.
Thanks for your help.
Edit :
[seb@pingus ~]$ cat /proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 6
model : 8
model name : AMD Athlon(tm) XP 2600+
stepping : 1
cpu MHz : 2075.627
cache size : 256 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 mmx fxsr sse syscall mmxext 3dnowext 3dnow up ts
bogomips : 4152.85tomk wrote:
Does this make any noticeable difference to your PC's performance?
Just curious.
For me, yes. As I said in the bug report, my computer is very laggy when the problem exists. I can't stand using it.
At the moment, I am using custom compiled versions of the 2.6.16 kernel (2.6.16.27, will update to .28 today) and the latest NVIDIA drivers. With this configuration, everything is fine.
There is the same behaviour with or without nvidia driver.
Bummer. I guess our problems are different. I experience the slowdown only when using X with the NVIDIA drivers. When X is not running, or I am using the "nv" driver, the problem does not occur.
- Rpg Cyco
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