CPU stands for Central Processing Unit, and is the main processing chip used in every computer. Brands include Intel, AMD and ARM. CPUs are commonly available in 32- and 64-bit, and come in a variety of frequencies or with multiple cores.

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Kworker consuming %100 CPU [duplicate]

Possible Duplicate: Kworker, what is it and why is it hogging so much CPU? I have a process, named kworker which is continuously consuming 100% of the CPU's computing capacity. I have tried ...
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224 views

How to maximize Java resources for gaming?

I notice that when I play Minecraft, my CPU usage is only around 15 to 20 percent, at most. Is it possible to force my computer to allocate as much RAM, CPU time, etc. to the game, in order to get the ...
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1k views

Downclock CPU reaching critical temperature

I have an HP tx1250 laptop. It always had serious overheating problems and although usually it runs fine I'm now running a continuous test for my dissertation, this brings the CPU temp close to the ...
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2answers
95 views

HELP! i cant run the machine! [duplicate]

Possible Duplicate: What is the difference between 32-bit and 64-bit and which should I choose? when i try to run the machine a messeage appear in the black screen sayinh "this kernel ...
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2answers
3k views

How can I lower the CPU temperature?

I have installed Ubuntu 12.04 on my EeePC 1015PX and I've noticed that the CPU temperature does not go below 60ºC (70 is usual). Looking at powertop it seems the 2 cores (Atom N570) are idle most of ...
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Intermittent 100% CPU running e.g. Firefox or Libre Office writer on 12.04 Unity

Occasionally some applications lock and their windows goes dark or changes colour. This has happened most frequently when running Firefox but happened today when running Libre Office Writer and ...
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1answer
2k views

Why is Ubuntu detecting only one processor core?

My processor is Intel P6100 which is a Dual Core processor. When I do cat /proc/cpuinfo this is what get varun@varun-K52F:~$ cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu ...
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1answer
954 views

System suggest for PowerMac G4 [duplicate]

Possible Duplicate: Is the current version of Ubuntu usable on a PPC mac? Processor: 400 MHZ (PPC 7400) Ram : 768 MB PC133 (+1 GB swap on HDD) Graphics : 256 MB HIS ATI Radeon 9550 ...
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153 views

CPU usage problem

A few days ago I bought a notebook (Asus N56VZ) and detect a problem with CPU usage. When I am surfing on the Internet or using some programs, CPU usage is jumping from 1-7% to 65-80%. Can you give ...
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4k views

How to change CPU fan speed on ThinkPad?

I checked this post on AskUbuntu, but like the OP my BIOS does not have a setting for 'smart fan'. My BIOS though has something similar called 'Thermal Performance' wherein it's already set to maximum ...
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561 views

Why is only one CPU detected on a Macbook with a dual-core processor?

I have a January, 2009 Macbook5,2. It has an Intel Core 2 Duo 2Ghz processor. Since installing Xubuntu 12.04, it runs very slowly. The CPU gadget in the top panel shows only 1 dark column to the left ...
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Why does kworker cpu usage get so high?

I recently installed Ubuntu 12.04 on my Samsung laptop alongside Windows 7. Whenever I use Ubuntu (even when its idle) kworker uses almost 90% of one of 8-cores. Even though it doesn't really affect ...
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155 views

Limit overall cpu usage Ubuntu 12.04 [duplicate]

Possible Duplicate: CPU frequency scaling for 12.04? I was wondering if there is a way to limit the total cpu usage percentage? I know that you can limit the usage per process with cpulimit ...
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1answer
387 views

Netbeans 7.2 suddenly has CPU spikes and slows down completely

When I first installed Netbeans 7.2 everything was pretty smooth. But for the past couple of days I've noticed that after a few hours of usage the CPU usage begins to spike to unbearable levels. ...
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3answers
569 views

How to speed up installation?

I have an Acer 4736z with 2gb Ram and ubuntu 12.04 is running too slow for my standards. I would like to know if I am running useless processes that I am not aware of and remove packages I will never ...
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1answer
493 views

Can't find “/sys/devices/system/cpu/sched_mc_power_savings”

I'm currently working on Ubuntu 12.04 x64. A lot of manuals about power saving in Linux tells about using parameters /sys/devices/system/cpu/sched_mc_power_savings and ...
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1answer
2k views

java uses 100% CPU and cannot be stopped

I've encountered that the java-process is started without any reasing (while no java-application should be run) and after a while uses 100% of the CPU (AMD Phenom II X4) I kill it with the gnome ...
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1answer
310 views

High CPU load during flash playback [closed]

I got a CPU load indicator applet and whenever I play a flash vid I see it going through the roof and staying high. I'm running 12.04 with the latest updates, restricted extras installed. Browser is ...
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1answer
2k views

Is there a way to change the speed of a CPU fan?

I got a more powerful CPU and can see from the system load applet that whenever the CPU has got some work, the fan turns up very much. It's much louder than before even if the CPU was working hard. ...
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1answer
566 views

System monitor show 8 CPUs for my Intel i7-3820QM?

I have a new System76 Gazelle laptop with an Intel i7-3820QM CPU. My understanding was that this chip was a quad-core. If so, why does system monitor show 8 cpus?
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1answer
370 views

Question on reported processor speed in System Settings>details

I have a Gigabyte motherboard and cpu I inherited from my son when he bought a new gaming machine. I changed the BIOS from 8x to 6x multiplier as I don't need the speed and I'd rather it ran cooler ...
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2k views

CPU temp on ubuntu 12.04 higher than on windows 5-10C in “normal usage”

This is something that I've been seeing on older ubuntu versions, too. I bought a new laptop recently and am seeing the same old thing. It's Asus K53S with i7 2670QM processor, 8G ram and a somewhat ...
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2answers
780 views

My CPU fan stop working on dell Inspiron 1545

After installing Ubuntu 12.04 my CPU temperature gets abnormally high: 80-86 °C. I saw that the CPU fan isn't running. Is it possible for this problem to be caused by Ubuntu or not?
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Fan always on and overheating problems on HP G62

I have a HP G62 with i5 processor, 4G Ram and ATI HD 5470. Started using Ubuntu 4 months ago, first was 11.10 and after 12.04. Everything worked perfectly until some weeks ago when my cpu fan became ...
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3answers
5k views

Ubuntu for Acer netbooks?

I want to install Ubuntu on my Acer netbook. But I've had problems with the new version. The problem is with the cpu or something like this. Is there an Ubuntu version for netbooks? What can I do? ...
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2answers
2k views

cpu fan always working and the air is hot

My laptop is a Dell N5110, i3, two video cards: Intel HD3000 and Nvidia GT323M. Recently I installed Ubuntu 12.04. After I login in the system, the fan starts working non-stop, the fan air is hot ...
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3answers
2k views

How do I analyze my CPU usage over a long period of time?

I am just wondering if there's any Ubuntu app that can track my CPU usage. The problem is that I am currently using a quad core i5, whilst what I do most in daily usage is just browsing and rails ...
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3answers
2k views

Is the CPU power management set permanently to Performance mode in 12.04?

after installing 12.04 from 11.04 and using the gnome-fallback desktop I installed the CPU scaler app in the top bar. It shows that my laptop is always running in Performance mode and never goes to ...
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1answer
370 views

Why is my AMD Quad 645 CPU running at 800MHz per core on Ubuntu 12.04

I've just loaded Ubuntu 12.04 onto a brand box with an AMD 645 quad CPU with 8GB RAM. In the BIOS it says, the CPU is running at 3100MHz. However when i boot into Ubuntu 12.04 it says 800MHz? I've ...
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1answer
1k views

interpreting Sensors command line output

I need some help in interpreting the output of sensors command : acpitz-virtual-0 Adapter: Virtual device temp1: +56.0°C (crit = +128.0°C) temp2: +67.0°C (crit = +128.0°C) temp3: ...
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1answer
58 views

What are these abbreviations?

can anyone tell me for what these abbreviations stands for? Coudn't find it on the web. Cpu(s): 3.2%us, 0.8%sy, 0.0%ni, 95.6%id, 0.4%wa, 0.0%hi, 0.0%si, 0.0%st Thanks in advance.
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89 views

Problem with my CPU

I wanted to ask if this is normal: Cpu(s): 6.3%us, 0.9%sy, 0.0%ni, 92.8%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st I typed "top" and got this result, I realise that only 1-2 cores are really ...
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3answers
926 views

Does ubuntu reduce CPU usage due to overheating?

I have been running for a day at 100% CPU and suddenly seems that for the same tasks as before its usage has been limited to 50%. I suspect that overheating may be the cause. I am using 11.10. Is ...
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1answer
2k views

CPU usage goes to 100% when I lock the screen

Whenever I lock the screen, after a certain amount of time, the CPU and the CPU fan go to their limits, and they return back to normal the moment I unlock the screen again (as shown by psensor). How ...
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1answer
67 views

Why after a time of inactivity three cores of cpu go off?

I run ubuntu 11.10 on a Dell inspiron N4050 which has an Intel Core i3 CPU. After a time of inactivity sometimes few seconds, sometimes 2 or three miutes or even more CPU2 3 and 4 spike then go to ...
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1answer
704 views

99% CPU usage for no reason

10 minutes ago I was just surfing the web as usual on my Ubuntu 10.04, when all of a sudden the system became slow. I realized that the CPU usage is 99%. I opened System monitor and everything seemed ...
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4answers
4k views

How to keep the laptop's temperature low without hardware cleaning?

Last few days I found out that when I open Google Chrome and the laptop's fans start working really hard and I can not touch the mousepad because of heating. I use Ubuntu 11.10 on my Toshiba A350-22z ...
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3answers
972 views

Acer 5749 laptop is overheating

I have an Acer 5749 laptop with core i3 CPU. I have migrated to Ubuntu 12.04 and am experiencing a serious problem: My laptop gets really hot when I use Ubuntu. I didn't have this problem with Windows ...
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3answers
980 views

mpirun -np N, what if N is larger than my core number?

Say I have a 4-core workstation, what would linux (Ubuntu) do if I execute mpirun -np 9 XXX Q1. Will 9 run immediately together, or they will run 4 after 4? Q2. I suppose that using 9 is not good, ...
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2answers
4k views

Fan speed high since upgrade to 12.04

Since I have updated to 12.04 LTS my desktop pc's fan runs permanently with high speed and is annoyingly noisy. CPU temperature is low. Here is what the sensors command gets me: nouveau-pci-0400 ...
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1answer
1k views

Psensor only shows HDD and CPU usage, not temperature

Okay I have psensor installed, I installed lm-sensor and some other related packages, I ran sensors-detect and didn't come up with anything. It is only showing my HDDs, and my CPU usage not ...
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2answers
22k views

Why ubuntu 12.04 Operating System too slow..?

I was using ubuntu 10.10 from last year. every thing was Ok with that. recently I've installed Ubuntu 12.04 in place of 10.10, after installing that on my Dell laptop, I started to feel uncomfortable. ...
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2answers
3k views

CPU High temperatures 12.04

Hi I have a Acer Aspire 4530 With a AMD Athlon(tm) X2 Dual-Core QL-62 × 2 prossesor. I installed Ubuntu 12.04 and now my laptops temperatures are realy high specially when using flash. This is one of ...
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2answers
2k views

Ubuntu 11 and 12 initially fast but later bogs down, CPU pegged

I started with Ubuntu 11 a few weeks ago. It's on a DELL M4300 with a OCZ SSD. Default setup, except that I've installed the proprietary NVIDIA graphics and BROADCOM wireless drivers. Dual boot ...
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1answer
530 views

Why does the system become laggy when connected to Internet?

Why when I connect my netbook to the Internet via LAN or Wifi does whole system becomes laggy? Even when in idle, the CPU monitor shows 100% usage when connected. I've had this problem about half a ...
8
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1answer
4k views

How to control CPU fan with no pwm-capable sensors?

I've tried to follow the directions on this thread: How to control fan speed? But at the end of the day, pwmconfig gives me this error: /usr/sbin/pwmconfig: There are no pwm-capable sensor ...
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4answers
6k views

watchdog/0 process using all my CPU suddenly

I have a fresh installation of Ubuntu 12.04, I have been running it for about a week. Suddenly today I noticed my computer freezes every 5 seconds. I restarted the computer and I still get this. I ...
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0answers
709 views

Flash videos overloads CPU [duplicate]

Possible Duplicate: How do I fix Flash issues? During streamig flash, in Chrome or in Firefox, in few minutes after start CPU is loaded for a 100%. Previously I have never had such problem ...
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1answer
397 views

CPU spikes when monitor shuts off

On my laptop, whenever the computer is idle a period of time (10 minutes I think) the monitor shuts off. At this time the cpu usage spikes, I know this because the fan starts going crazy. When I move ...
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1answer
467 views

Ubuntu install error

I get the following error when installing ubuntu 12.04: *Stooping CPU interrupts balancing deamon .............................. [OK] This is printed on black screen. I get this when I want to ...