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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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 ...
3
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436 views

How to set governors for Intel to work as old good ondemand?

I used to work on my laptop on ondemand governor, which was switching CPU frequency depending on CPU usage. It worked quite nice for years and had three very important advantages: low hardware ...
3
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0answers
151 views

16 cores are not being utilized out of 80 cores

Recently I discovered that our server does not utilize all 80 threads anymore in the system. It looks like if 16 cores are always idle, despite the high system load. Its a Dell powerEdge R900 server, ...
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86 views

One of my two cores suddenly flatlines at zero percent

I've been using Ubuntu for about three months, and twice now the first core of my dual-core laptop suddenly flatlined at zero percent for no apparent reason, while the second one seemed unaffected. ...
3
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0answers
2k views

Ubuntu CPU load

I'm new to Linux world and I have a problem with my fresh installation of Ubuntu 14.10 64-bit. My processor is Intel® Pentium(R) D CPU 2.80GHz × 2 with 4 GB of ram and GeForce 8600 GT/PCIe/SSE2. When ...
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0answers
3k 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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38 views

ubuntu black screen appears

I am using ubuntu 12.4 in that we have installed 2Gb RAM dual core processor I have installed some of the software like eclipse , SQL . while using these software's few seconds screen goes into black ...
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388 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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290 views

ubuntu 12.10 64-bit consuming 100% cpu power and high battery

I am new linux user, installed ubuntu 12.10 (64-bit) from wubi (getting boot option (windows7/ubuntu). But after opening ubuntu, laptop gets heat up, fan running very fast and performance is very ...
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149 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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561 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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662 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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50 views

What is the mediascanner-service and how to avoid getting it installed?

Since a few months, on one of the desktop Ubuntu 14.04 systems I use, CPU has regularly been going up to 80-100% for no apparent reason. htop would usually attribute responsability to file system ...
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92 views

fan control issues on Toshiba Satellite c655d-s5136

On Ubuntu 14.04, my fan always runs,even when idle. This is not the case when I am in Win7,in which it only runs when I am playing movies. This bothers me greatly and I have followed other threads ...
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16 views

Ubuntu 14 Idle - Non Activity Causes Poor Performance

I'm having an issue with Ubuntu 14. I have a touch screen and I noticed after medium to long periods of inactivity the device "throttles down" and takes a few moments to snap back. When I tap the ...
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0answers
36 views

ubuntu halts itself in high cpu workload

I have Core i3 M370 laptop. When i do high cpu intensive tasks such as kernel compilation with make -j4, the system halts itself. It doesn't happen like instant crashing. It happens like "shutdown -h ...
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107 views

CPU high usage with no reason

I am experiencing high CPU usage and overheating with Ubuntu 14.04 on a Dell Inspiron-N5110 laptop, seemingly for no reason. CPU: Intel(R) Core(TM) i3-2350M CPU @ 2.30GHz Cadencé à 2.30 GHz RAM: 4 ...
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122 views

After upgrading my CPU cpufrequtils does not work

After upgrading my CPU (nothing else changed on my system) I can't change the governor of my CPU. I tried reinstalling cpufrequtils, but got the following error: Setting up cpufrequtils (008-1) ... ...
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111 views

Why my PC turned off unexpectedly?

Let me tell the complete story. I have a normal PC with monitor, CPU, UPS, mouse and a keyboard. I use Ubuntu 12.04 LTS. For the last 15 days my computer is shutting down unexpectedly. Here in my case ...
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144 views

Java & High CPU usage

I use a certain java application to trade the stock market and it consumes 90% my CPU power. And the CPU temp usually remains around 90c. This is a real headache. What causes this problem and what are ...
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62 views

CPU usage varies from 0 to 100. Strange waveform

so I have a strange problem. I'm currently using an old Thinkpad T61 and Ubuntu 14.04 LTS, although this same problem was also happening when I had elementary OS Luna (based on ubuntu 12.04 LTS) ...
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309 views

xubuntu: compiz using 100%+ cpu

I seem to be experiencing an issue with Compiz in terms of cpu usage. The only thing I've been doing differently (been running this system for a month or two with no issues) is I have been running ...
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330 views

Ubuntu 14.04 lost cores on AMD CPU

It seems that I have a problem. Installed 14.04 a few days ago, everything was smooth sailing until yesterday it wouldn't boot up. Recovery mode says that CPU's 1-6 don't respond. After 7 it moves ...
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131 views

CPU fan not working in acer gateway ne56r

My laptop fan was not running in ubuntu 14.04 and hence it become heated up easily. Kindly help to get a solution for to get my laptop fan running. In windows i never had these kind of issues
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78 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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198 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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155 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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208 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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40 views

Processor Tunable status according to Powertop

I am absolutely new to the LINUX platform, since I just migrated to Ubuntu 13.10 from Windows8. I installed powertop so that I could assess my processor. The Tunables window of the output returned by ...
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80 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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0answers
155 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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136 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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286 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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757 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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283 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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0answers
267 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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20 views

what is the difference between x86_64 amd64 and 64 bit

what is the difference between x86_64 amd64 and 64 bit ? I think its a stupid question but still. I use a x86_64 bit Ubuntu, but when ever I try to do a live boot of any other 64 bit images like the ...
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0answers
23 views

CPU working at 100% clock spead on Ubuntu 14.04 LTS

I recently installed Ubuntu 14.04 LTS on my x64 laptop and now my CPU is working at 100% and overheating due to that. There is no software installed on the machine. I reinstalled the OS but my problem ...
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18 views

Ubuntu 14.04 gets a pegged CPU exactly when I plug in a new monitor

It used to work fine with an old TV screen I had with a VGA input. Didn't use it much, rather I'd VNC in normally. Recently got a new Dell monitor and I am absolutely baffled by how the CPU spikes the ...
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67 views

Overheating shutdowns after fresh installing Ubuntu 14.04

Since 10 days I can't figure out what might cause the overheating. The machine is Samsung np300v5z : Intel Core i5 2.450 M / GeForce GT 520MX, Optimus 1Gb/ 8 GB Ram OS - Ubuntu 14.04 Things I did ...
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0answers
24 views

AMD APU Driver Trouble

I just built a computer and installed ubuntu onto it and I'm new to ubuntu and I don't know how to install my APU driver onto my computer my APU is the AMD A6-5400k
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13 views

Virtualization hardware review

I'm running an home server based on Ubuntu 14.10 for running some services that I need on my LAN such as: mysql db, LAMP stack, NFS share, Squid proxy and so. My machine is built on Intel(R) ...
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114 views

T430 i5 overheating

Heavy overheating - How to stop? I have a ThinkPad T430 running a Intel® Core™ i5-3320M CPU @ 2.60GHz × 4 (IvyBridge) on Ubuntu 14.10. I reinstalled Ubuntu a few weeks ago. While I always thought ...
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0answers
13 views

Desktop computer slowdown on heavy loads

In Linux generally, is it possible to limit cpu, ram and iops(hdd,nic..) given for processes not belonging to core operating system, including system libraries, X server, system utilities, user ...
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11 views

Athlon 5150 drivers

what is the best driver for the Athlon 5150 for general use? and does one exceed in areas where the other falls short?
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0answers
24 views

Unable to resume from stand-by

I usually let my machine suspend to ram after time X. That used to work very well but within the last few days, I have had problems multiple times to wake my machine up and get it back into working ...
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12 views

how accurate are i7z readings

I'm running a very intensive program called Gromacs on ubuntu and use i7z to monitor temperatures and CPU frequencies. I noticed that the temperature is sky rocketing in ubuntu for frequencies that ...
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43 views

Unmet dependencies. Try 'apt-get -f install'

sjp@sjp-Lenovo-IdeaPad-Y530:~$ sudo apt-get install cpu-checker [sudo] password for sjp: Reading package lists... Done Building dependency tree Reading state information... Done You might want ...
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21 views

SCHED_BATCH policy for schedtool in Ubuntu 14.04

The INSTALL file of schedtool says that the SCHED_BATCH policy (-B) is implemented in kernels 2.6.16+. However, I am unable to use this policy in Ubuntu 14.04 (kernel 3.13.0-45)? The output of ...
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35 views

What in install.sh in Kubuntu 14.04?

My laptop fan is sometimes loud when running Kubuntu 14.04, I guess it is because of one process taking 12-13% of CPU memory. I am new with KDE/Kubuntu. What is that? Should it be running like ...