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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How to enable cpuset on Ubuntu 12.04?

I have set up CPU sets with cset in Ubuntu 12.04, but they are not respected. Processes just use all the CPU they can, no matter what set they are assigned to. It seems that cpuset is not enabled. ...
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2k views

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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243 views

In Ubuntu 12.04, odd whining/humming coming from left side of MBP (2,2)

I have been searching for a similar issue to mine, but unfortunately haven't found anything. Anyhow, this week I installed 12.04 on my 2006 MBP (2,2). Pretty much everything seems to work OK, but ...
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126 views

CPU fan kicks in to full gear when i try to install ubuntu 12.10 or LTS

Whenever I try to install (DUAL BOOT WITH WINDOWS 7) both versions of Ubuntu desktop on my PC the CPU fan starts spinning so fast that I couldn't even go through the installation for fear of my CPU ...
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357 views

Screenlets RingSensors has to many CPU sensors, what are they?

I just installed screenlets to get some onscreen information about my system. I'm trying the RingSensors screenlet to monitor cpu load, but there are more sensors available to monitor than I'd expect. ...
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563 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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33 views

kworker taking 100% of one core

I updated from ubuntu 13.10 to 14.04. I have a quad core, and one core is pegged at 100% usage because of kworker. I know that kworker generally is doing things on behalf of the kernel, but I don't ...
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15 views

Amilo V8210 cpu fan speed issue

I got a Fujitsu-Siemens Amilo Pro V8210 with Intel® Core™2 CPU T5500 @ 1.66GHz × 2 and have installed Ubuntu 13.10. CPU fan issue as many others. Checked the BIOS settings, nada. BIOS is updated. ...
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40 views

What is causing Ubuntu on MacBook Pro to have high CPU usage?

I installed Ubuntu 13.10 on a MacBook Pro 10,1. However, after installing, the kworker process consumes over 90% of CPU usage. I tried the following: (Suggested in this answer) Execute grep . -r ...
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26 views

How to find out which service uses a certain CPU core?

How can I find out which process/application uses Core number 4? As I saw in Htop there isn't any application which uses high CPU, but still my fan is running "wild" and also the CPU graphic in Htop ...
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44 views

Banshee CPU usage > 100%

Banshee CPU usage peaks and maintains >= 100% (according to htop) when I do simple, nontrivial things. Even deleting files via Banshee results in >= 100% CPU usage. I have tried several ...
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88 views

ubuntu 12.04 Init process provokes memory leak and CPU intensive usage

I have lately been having some memory and CPU issues with init process. After rebooting, the memory used by it keeps increasing at quite high pace, and after half hour it occupies all the memory RAM ...
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28 views

Xorg High CPU When Redrawing

For about the past week or so, xorg has been going crazy whenever the screen updates, for example scrolling a webpage, or just moving a window around. I can hear the fan turn up, and there is a huge ...
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84 views

ubuntu 12.04 - fuser high cpu

The problem is fuser high cpu and server load high. root 20 0 7580 840 692 D 10 0.0 0:00.31 fuser 16061 root 20 0 7580 844 692 D 10 0.0 0:00.31 fuser 16062 root ...
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54 views

Laptop with Battery is faster than Power Connection at Ubuntu 13.04

Recently, I found a very strange phenomenon on my laptop. When the laptop is plug-in the power, then the CPUs work slowly, but when it is unplugged, i.e. it works with battery, then the CPUs work with ...
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60 views

Why my CPU of 2.1GHz clocks at 800mhz in Ubuntu 13.10?

I've a problem with my notebook DELL INSPIRON 1720. This notebook have a CPU Intel t8100 2.1GHz and it doesn't work perfectly. It works at 800MHz stable, like in power-safe. But when I change the ...
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94 views

How to find CPU shutdown temperature? (Think it's called TJMax, maybe not though…)

In Windows there is a program called CPU Temp which shows various CPU temperatures, one which being the temperature at which point the computer will shut down to prevent damage to the CPU. I have a ...
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167 views

TOSHIBA Satellite U400 kernel 3.10 3.11 3.12 cpu fan

After switching to any kernel above 3.9.11 my cpu cooler acts like cpu was overheating, it spins all the time trying to cool down processor even if it's below 50 Celcius. I don't think it's the distro ...
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501 views

Measuring load - %CPU in top is different than %us on server running tomcat

When I run TOP on a remote server, I see a very small system utilization (3.8%us). However, for the actual process I am seeing 29.6% of the CPU. Since this server has 8 CPU cores, is the %CPU the ...
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115 views

Overclocked CPU speed not detected in Ubuntu 13.04

I have a stable overclock that I have been running since Ubuntu 12.04. However, after upgrading to 13.04, the available frequencies only includes up to my stock speed as per: cat ...
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156 views

12.04 gvfs-afc-volume CPU usage high, no iphone

I've notice many people reporting this problem and I'm suffering from it too on Ubuntu 12.04. I'm using GVFS for android support, but I rarely connect to any GVFS devices yet this problem appears all ...
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226 views

High CPU temperature when using GNOME

I have ASUS Extensa 4220 laptop.If I install Kubuntu (any KDE-based), then the CPU temperature looks normal for a long time (now it is 74 degree Celsius). But when I install GNOME-based distros, then ...
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63 views

How to investigate scheduler issues?

I have a server process that should runs multiple threads at close to 100%, each on its own CPU. When I run the process on a RHEL box, the CPUs in question appear to stay pegged at 100%, according to ...
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203 views

Ubunut 12.10 64 bit using 100% CPU

Configuration Ubuntu 12.10(64 bit) i3 Processor Ruby 1.9.3 Java openjdk(6 or 7) Any ruby or java command using 100% CPU. It works perfectly fine with ubuntu 10 or 11 (32 bit).
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586 views

Xorg and compiz using 20% of CPU

I'm not doing anything in particular but Xorg is currently using 8-15% of my CPU and Compiz is using 5-15% as well. I have 4 virtual desktops (aka workspaces) and like 10 windows open but I see no ...
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235 views

Increased CPU temp compared to Windows 7

I have a Lenovo Z570 Thinkpad with windows 7. One of my friends suggested that a 4GB RAM is much more effective when working on Linux than on Windows, so I searched a lot and installed Ubuntu ...
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161 views

high interrupts

I have high Rescheduling interrupts and Local interrupts. while doing nothing my total CPU wakeups reach 275-400. While watching movies it reaches up 900-1000. And while browsing the Internet it ...
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91 views

CPU performance decreases with AC power

I am doing CPU-intensive work on my Thinkpad X220 laptop and I find the performance bad. Interestingly, the CPU becomes more powerful if I disconnect the AC power and run only on battery! It does slow ...
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166 views

Can't Boot Kernal Error -CPU Features

When I try to use Ubuntu on my PC (Windows), I get the following error: This kernel requires the following features not present on the CPU: pae Unable to boot - Please use a kernel appropriate for ...
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217 views

Reading cpu temperature Intel Celeron (R) with lm-sensors

I know there are already a lot of questions like this, but non of the answers provided there could fix my problem. I try to read out my cpu temperature with lm-sensors on my ubuntu 10.04 LTS ...
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475 views

CPU heating up too much and locking the notebook [12.10 32bits]

I have an AMD A6-3400m. When installing ubuntu 12.10 the CPU gets too hot. When I go to see the cpu usage not see anything unusual. I think she is working at or above the specifications of the cpu. I ...
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6 views

Asus G75VW cpu runs hot up to 70c, using Ubuntu

Any idea at all would be helpful. Specifications: Brand: ASUS G75 Series Model: G75VW-BBK5 CPU: Intel Core i7-3610QM 2.3GHz Screen: 17.3" Memory: 32GB DDR3 Hard Disk: 120 ssd 1TB Optical Drive: ...
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73 views

Unreliable CPU thermal sensor; monitoring disabled Ubuntu 14.04

I installed Ubuntu 14.04 on my PC and it shows something like that when i boot: unreliable CPU thermal sensor; monitoring disabled Is there something wrong with my CPU or is it sensor fault ?
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40 views

i7 temperature too high

I use Ubuntu 14.04 and a notebook with i7 cpu. The problem is that I've 50° on cpu in idle, while in Windows I've 40°. Can you tell me why I've this problem? I've also installed nvidia proper ...
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21 views

command not found when trying to set governor

In response to my questioning here: How to really check current cpu Hz? Sylvain Pineau told me to do this command to change cpu governor: echo "powersave" ...
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46 views

100% I/O usage due to jbd2

I have 14.04 Beta 2 64-bit and Intel i7 Processor with 2.2Ghz clock, 4 GB RAM and 500 GB Harddrive. After using Ubuntu for some time, everything goes so slow and I cannot even move my USB mouse ...
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17 views

CPU Problem with 13.10 VMware Player Appliance

I have mounted a 64-bit Ubuntu .iso onto a VMware Player virtual machine, but it came up with a messsage saying my host is unable to run 64-bit guest OS-es. I have checked this issue with the VMware ...
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9 views

Heavy CPU usage with LTspice on Ubuntu 12.04 32 bit

I currently have LTspice IV installed on my ubuntu 12.04 32 bit machine through wine. I have no major problems running the actual software, but the thing that worries me is how much CPU power the ...
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52 views

High CPU usage for graphical (Streaming/Offline Video) usage

Whenever I stream video (HTML5 mostly, sometimes flash) my CPU usage shoots quite high, often reaching close to 90%, although very less RAM is being used. I installed libvdpau-va-gl to enable hardware ...
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21 views

Making CPU online doesn't work (armv71)?

I am trying to turn CPU status to online, but it doesn't seem to work. I run this: echo 1 | sudo tee /sys/devices/system/cpu/cpu0/online Here is what I get when I run lscpu: Architecture: ...
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43 views

How do sensors-indicator colors work?

I have been using lm-sensors for a while now, and decided to try sensors-indicator not to enter the command manually on Terminal each time I want to take a quick look at my laptop's temperature. My ...
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85 views

Is this CPU usage for TeamViewer on Ubuntu normal? If so, are there any better options?

This image was taken while logged in remotely via TeamViewer to my workstation. There are four TeamViewer_Desktop processes open (why?), two of them taking a large amount of CPU (why?). I tried ...
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0answers
115 views

lm-sensors not showing CPU temperature?

I have a machine running on top of AMD Opteron 6380 (16-core) x2 CPUs. OS details are as follows: Version: Ubuntu 12.04.3 LTS (precise) uname -a: Linux sysname 3.5.0-23-generic #35~precise1-Ubuntu ...
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22 views

MacBook Mid 2008 use both CPU cores/Deactivate nolapic

I'm quite new to this community so bare with me if I happen to do anything wrong. I've got a problem with my MacBook 5,2 (mid 2008) running Ubuntu 13.10. It detects only one core, though the System ...
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79 views

How to change CPU fan speed? (Works in Windows)

I've got an MSi G45 board and a 3570K with a CM 212 EVO cooling it. In the BIOS, I change the ambient fan speed for my CPU cooler to 12.5% - so when I boot up and it through POST, etc., the fan spins ...
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201 views

High CPU usage in any browser

For about the last week, browsing the web from Chrome beta, Chrome stable, or firefox causes unusually high cpu usage. It Idles OK, but spikes a fair amount, but loading any page, with or without ...
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45 views

Installed FX-6300 (6 core) from Semphron (1 core) and now interrupt request storm (ksoftirqd)?

Scrypt mining in cgminer used to have no issues with Semphron 145, I switched to FX-6300 and processor usage shot up to 100% and stuck there. cgminer process is consuming about 20% and six ksoftirq ...
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33 views

Ubuntu 12.04 new kernel taking way more CPU usage

I recently upgraded to Linux Kernel 3.2.0-58 on Ubuntu 12.04. It works well but today I noticed that it was using 60% CPU usage of the computer. The only programs that were open were GKrellM System ...
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60 views

Numerical performance of Intel's 4th generation vs 3rd generation cpu's on ThinkPad

Maybe a stupid question, but any feedback would be appreciated! I just purchased a new pc in order to run the latest Haswell cpu on some numerical benchmarks. To my surprise, I found that the exact ...
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90 views

CPU usage increased to 90-100% after installing Nvidia X server

I have latest version of lubuntu and i5 2500K cpu. Yesterday I installed nvidia drivers using this guide at www.dedoimedo.com, first method. Before I installed drivers I did sudo apt-get update sudo ...