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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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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22 views

Battery consume

i know this is a frequently asked question. After trying win 8.1 and latest opensuse i feel ubuntu 13.10 to consume much power. Lenovo B590 notebook with 1TB 5200rpm hdd, 8 gigs of ram, i5 2.5GHz ...
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20 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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29 views

How to really check current cpu Hz? [duplicate]

All programs I've tried seem to be listing Hz from cpu's specifications not actually checking what the current Hz really is. for example a processor is marketed with 4GHz.But this is the max (unless ...
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33 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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32 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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14 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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54 views

Ubuntu 12.04 freezing during parallel processing [on hold]

I'm currently trying to implement a pretty cpu intensive task using Julia. I made a single threaded version which works fine. However, problems arose when I implemented a paralleled version, which ...
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8 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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45 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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18 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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28 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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33 views

Ubuntu 13.10 CPU1 usage over 75% and other core 20% [duplicate]

Ok i'm on Ubuntu 13.10 64bit and while doing nothing i can see from System monitor that CPU1 has a 75%+ of load meanwhile the other core stayat 20%...sometimes they go up but not for too long...What ...
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75 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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1answer
93 views

high CPU usage on Ubuntu 12.04

I just installed Ubuntu 12.04 on my Asus k53s notebook. Processor is Intel® Core™ i5-2410M CPU @ 2.30GHz × 4 5.7 GiB RAM. The CPU usage gets very high after a while, specially when using internet. ...
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25 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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38 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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1answer
48 views

apt-build on ubuntu, if I change processor will give problem?

I installed apt-build on Ubuntu, it is a program that compiles and installs programs. It compiles optimally for the user processor and this makes programs run quickly. But I thought what if I change ...
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1answer
26 views

Changing cpu from intel to amd

I currently have two computers using ubuntu, I want to switch the hard drives of the two so the one I use more has more space. My problem is one of my computers has a intel cpu and one has a amd CPU, ...
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104 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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34 views

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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1answer
74 views

Lubuntu Task Manager always shows CPU usage at 100% even at idle

Is there a way to find out what application is causing the high CPU? Top shows nothing eating up the CPU. Even at idle my CPU is at 100%. Never changes. Never goes down. Always at 100% no matter what. ...
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21 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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76 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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74 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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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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196 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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2answers
257 views

Ubuntu 12.10 gnome system monitor high cpu usage

I am totally new to Ubuntu. I tried to install numerous times, but always removed it because of loud fan noise. Me and my Bro have the same Notebook, a HP Compaq 615, and what grabbed my attention ...
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43 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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18 views

Is it there a software like Speedfan for Ubuntu? [duplicate]

I need to lower the CPU fan's RPM. Thanks in advance.
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1answer
72 views

How can I see my System details in a Graphical way? (in Lubuntu)

I am new to LUbuntu. In Windows, if I want to know my system properties, I see it by going to Control Panel and clicking on the System icon. What are the equivalents of these features in LUbuntu, ...
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83 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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52 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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32 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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1answer
119 views

How can I add the current CPU usage to my menu bar as a percentage?

I'm used to OS X and I use MenuMeters in my menu bar to monitor CPU usage as a percentage and memory as used/free totals. I really want to add this functionality in Ubuntu as I'm using it for ...
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1answer
47 views

safe to use Cpufreq

I have a hp pavilion dv5220us with a dual core T2050 (1.6Ghz , 2M L2 Cache , 533mhz Fsb.). I was womdering if it is safe to use CPU freq. the applet for Ubuntu 12.04.
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55 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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1answer
98 views

Can't scale frequencies, always jumps to lowest

The title pretty much explains it. I know this is not a hardware issue. CPU is an Intel Core Duo Output of cpufreq-info: cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009 Report errors ...
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27 views

My computer runs Windows 7 64-bit, but won't install the 64-bit version of Ubuntu [duplicate]

I have a laptop that runs Windows 7 64-bit. I'm trying to install Ubuntu to be a secondary operation system, but when I run the setup I get a screen that says This kernel requires an x86-64 CPU, but ...
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1answer
136 views

How do I use all available hardware resource in my Intel® Core™ i7-3517U?

My sony vaio has a processor model: Intel® Core™ i7-3517U It appears to me as being 4 cores but it does not show the threads. What is wrong? How could I fix it? How can I access that information? I ...
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88 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 ...
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1answer
104 views

Set A Lower P-State For My CPU (Underclocking)

In Windows 8 you can set a max/min cpu speed percentage allowing you to use your cpu at a lower or higher P-State. For example, my cpu has a default speed of 2.3ghz (turbo 3.2ghz), however using the ...
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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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2answers
185 views

Stop cpu from overheating

When running intensive apps like blender my CPU can get up to 80.C I can manually underclock the CPU from the BIOS but I would like to have my pc detect when the CPU temp gets too high and slow things ...
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10 views

What is kworker and why is it using almost 100% of the first cou core? [duplicate]

I know this question is asked several times, but I don't find a solution (if there is any) I have a samsung series 7 CHRONOS laptop. CPU - Intel® Core™ i7-3635QM CPU @ 2.40GHz × 8 I'm on Ubuntu ...
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148 views

cpu load not distributed over cores

Under heavy task it seems the cpu load is not spread accross all available cores and fan is triggered wile I am waiting for the opération to perform... Looking at the CPU monitor one CPU is 100% when ...
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92 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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2answers
118 views

How do I Manually Limit CPU Usage? [duplicate]

I have an old laptop prone to overheating and a good solution I found was limiting it's CPU usage to below 50%. On Windows, I can do this by changing the power plan I am currently using, and altering ...
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1answer
30 views

cpu power mode occasionally changing to performance

The CPU power mode is occasionally changing to performance which causes my laptop to overheat and shutdown :( Is there any way to prevent that?
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2answers
2k views

“Kernel requires x86-64 CPU, but only detects i686” in an Intel Intel Core i7-2600k?

I have a VM installed in my windows 7 PC, and I want to install an Ubuntu 13.04 on it, as a new virtual disk. I have this machine: Intel Core i7-2600k CPU @ 3.40Ghz - 8 GB RAM - 64 bit operating ...