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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Can we calculate the bandwidth for a CPU?

I have read somewhere that we can calculate the bandwidth for a ram like this. Assuming the ram clocks at 1600 MHz without dual-channel, the bandwidth is 1600 MHz * 64 bits = 102400 Mbit/s, which as I ...
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5answers
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Kernel requires an x86-64 CPU, but only detected an i686 CPU. How can I install Lubuntu/Ubuntu?

I'm trying to install Lubuntu on my laptop (sorta old 2005). [Laptop stats: Intel® Celeron® CPU 410 @ 1.46 GHz 1.47GHz, 448 MB of RAM] I press Install and this message appears: This kernel requires ...
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7 views

nagios plugin to check cpu usage in my server

check_CPU Plug-In I need Plug-In for nagios3 to check CPU usage in Ubuntu. I don't found any Plug-In for that
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230 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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1answer
4k views

High CPU usage while playing Flash and using Jupiter

Hi guys from what I see by Googling around it's a common problem but somehow all the threads I've seen end in "Oooo Flash is terrible" and the post dies there. I'm experiencing a very high CPU usage ...
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1answer
39 views

number of logical cores exceed expectations

I have a system with an I3-3220 which based on Intel's info has 2 cores capable of 4 threads each (or total). However I noticed while watching htop with an avconv encode running that there were 16 ...
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16 views

systemd-udevd using a lot of CPU power

I noticed that my laptop started running a little hot and the fan started to kick in more and I saw that systemd-udevd was using a lot of my CPU High CPU usage shown in top so then i did a strace ...
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1answer
104 views

Celeron N3050 Braswell CPU usage too high on Ubuntu 14.04

I have an intel NUC with an N3050 in it. Just running Firefox and gnome system monitor seems to keep the CPU usage at 100% (sometimes but not others)! I am using it as a media center, and first ...
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2answers
51 views

Forcibly reduce usable CPU

I'm looking for some sort of method to reduce the heat produced by my laptop. I was wondering if there is a method to throttle the CPU usage in Linux. I have a laptop whose fan seems to be going a ...
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2answers
44 views

Is it good to operate the CPU at 71 degree Celcius

My laptop configuration are Dell 3521 Core i3 3227U @ 1.9Ghz 4GB RAM Intel HD4000 graphic + radeon HD7670m 1GB DDR3 dedicated graphics. As the CPU fan runs at max from staring of ubuntu, I am using ...
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Ubuntu 14.04 CPU fan issue

I just installed ubuntu 14.04 on my dell latitude e5450 and it doesn't seem like the cpu fan is working correctly. I had a 500 gb hdd in my computer and today took it out and installed a 240 gb ssd ...
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14.04, I have Disabled CPU throttling, but installing Atlas says: “CPU Throttling apparently enabled”

My PC is using ubuntu 14.04, and I need install Atlas. Atlas says: it need to disable CPU throttling, I have done the job to disable it. cat ...
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1answer
48 views

NMI watchdog on Haswell

When i'm trying to boot ubuntu on my laptop (Asus Transformer Book Trio TX201L), i'm getting this [ 60.079064] NMI watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [swapper/0:0] The only way i can ...
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8 views

How i can activate cpu.cfs_quota_us in Cgroup?

How I can activate cpu.cfs_quota_us function in Cgroup on Debian Jessie (raspberry pi 4.1.13-v7+ kernel)? This file not exist in cpu controller after creating the group and I didn't find how I can ...
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40 views

How to enable Ubuntu to use all of my CPU's cores

I'm running Ubuntu 15.10 with a AMD Six-Core 6100, I run the command lscpu and it shows up as this Can anyone help me :)
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82 views

Abnormal fan behavior: Sticking and persist on max speed (HP Envy 6-1154er & Ubuntu 14.04)

1. I have HP Envy 6-1154er under Ubuntu 14.04 LTS. I encountered the invalid fan behavior. As cpu load grows and if it makes fan to work on max speed the speed never goes back to "silent mode". When ...
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2answers
1k 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
2k views

TLP don't change CPU frequency

I check CPU clock speed with cat /proc/cpuinfo | grep "MHz", After sudo tlp start and sudo tlp bat still frequency is 2100MHz (Maximum). Could you please help me to solve this problem? I'm using ...
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1answer
23 views

View size of CPU cache through the command-line?

How do I view the size of my CPU cache using the command-line? I want to view information on L1, L2 and L3 cache. Also, would it be possible to ouput only information on cache, so that all other ...
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0answers
55 views

Idling VirtualBox Windows XP guest consumes >100% CPU host

As the title, I'm running a Windows XP 32bit guest on a Ubuntu 14.04 64bit host using Virtualbox 5.0.12. More often than not the Virtualbox process consumes more than 100% of CPU, even if the guest ...
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10 views

High fan utilization for 30 seconds every 50 seconds on Ubuntu 15.04

About twenty minutes ago, I was getting a fan speed of full every fifty seconds. This was slowing down my computer, and even moving the mouse or typing a key took seconds to affect a change. I took ...
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16 views

Does Ubuntu have a Windows SpeedBoost feature?

My computer only has 1GB of ram and I want to run a Minecraft Server which requires more ram. Can I use something like Windows SpeedBoost?
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18 views

How to extend the virtual memory in Linux?

I have a 1GB ram pc, is there a way to extend virtual memory? I cannot do anything because my pc is moving horribly slow. I am planning on buying a raspberry pi b+ and really need it fast for a ...
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10answers
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How can I discover why the game Dota 2 causes a reboot?

The background to my question The main problem is that, when I'm playing a game (Dota 2) the computer restarts only (and only) when the game finish (exactly when the scoreboard appears). It doesn't ...
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1answer
46 views

Intel Core i7-3612QM multi-core CPU not being utilised properly

I have a Dell Inspiron 7520 with an Intel Core i7-3612QM CPU that repeatedly cycles through 100% usage of each individual core while barely using any other core as shown in the screen shot below. ...
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2answers
77 views

This kernel requires an x84-64 CPU, but only detected an i686 CPU

I have used Ubuntu on my laptop for several years without problems. I now want to download it to my desktop. I followed all the steps, but when it starts to load I get "This kernel requires an x84-64 ...
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28 views

How do I fix high COMPIZ CPU consumption 14.04 other “fixes” haven't worked

So everything was working perfectly fine until I tried to install the proprietary drivers. (I have an Nvidia Ge Force 320m) I had a suspicion that I may be unable to boot, and my suspicion was ...
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1answer
102 views

Issues running ubuntu 15.10 on Acer r3 131t acpi need to be of

I am trying to install ubuntu 15.10 on my acer R3 131T. I have run in to several problems, most of which where easy to fix. However there is this one problem i can't seem to get by. I can not boot the ...
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1answer
2k views

Performance Ubuntu 14.04.3 LTS vs 15.10

I am running now on Windows 7, but i am thinking about going to Linux (Ubuntu), i have experiences only with debian (VPS) yet :) But i like Linux, so i would like to have Ubuntu as my primary desktop ...
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4answers
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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How do I find the right ubuntu kernel for an i686 CPU? [duplicate]

I burned a copy of Ubuntu to dvd, I went to install it on an Acer Aspire 5610z which had vista. I removed vista and put xp on it about 3 or 4 years ago. My problem is that I now have a black screen ...
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51 views

Problem with CPUPower

I have set my CPU frequency to min and max, but when my laptop is plugged to the adapter it changes it automatically the min and max frequency to the maximum CPU frequency (2.2Ghz). When it is ...
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1answer
78 views

Why is khubd process using too much of my CPU?

analyzing the process manager I found that the khubd process uses more CPU than other processes all that are running. It uses at least 25% and even uses around 40%. Does anyone know what this process ...
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30 views

fancontrol eating up cpu

I am experiencing huge fan control problems. I recently switched from windows 10 to ubuntu gnome 15.10, and I juste love it ! After trying to install nvidia drivers and prime support for several days ...
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1answer
44 views

L3 cache appears as disabled

In my XPS 8700 i7 4790, the comand lshw shows that the 8MB L3 cache is disabled, does this mean that the L3 cache is not working? should I not use ubuntu and go back to windows? does the operating ...
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2answers
577 views

My fan is DEAFENING - Please help, i googled and googled to no avail [VAIO Laptop]

- Greetings to all helpful Ubuntu Gurus - i'm using a VAIO VPC EB100C Laptop with an Ubuntu 11.10 OS running on it [64bit] and i'm having grave issues with my fan - it runs non stop. I doubt that ...
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2answers
75 views

top command on ubuntu multicore cpu shows cpu usage >100%

I have ubuntu running on a multi-core CPU with 32 cores. When I check the cpu usage using top command, sometime it shows more than 100 %, like 340%, 650% etc. I did some investigation and found that ...
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1answer
49 views

LibreOffice cpu usage 50% in Ubuntu and Xubuntu 15.10

When I load 400 pages of ODT document in Ubuntu 15.10 and Xubuntu 15.10, cpu usage becomes 31%. It is soffice.bin file. After editing, cpu usage becomes 50% (cpu0: 100%, cpu1: below 10% or vice versa) ...
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77 views

Kswapd0 using 100% of CPU

I've got a mini server running (L)ubuntu 14.04.3, kernel 3.4.39. Every once in a while, the process kswapd0 will use 100% of my CPU power, even though I only use about ~20% of my RAM at that time. ...
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1answer
168 views

Ubuntu 14.04 - crontab @reboot hang my PC

Trying to resolving the bug for KWORKERS HIGH CPU, as suggested in this answer. I put in my crontab the row: @reboot echo "disable" > /sys/firmware/acpi/interrupts/gpe06 After the reboot, the ...
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25 views

Is there certified version of Ubuntu for Dell Vostro 3300 i5?

I recently started using Ubuntu 14.04 LTS. I often get "System Problem" messages, as well as other small issues. (System freezes from time to time, especially when using LibreOffice.) I am not ...
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2answers
1k views

High CPU by Firefox

For some days, Firefox has been consuming high CPU percentage while simply loading pages. It drops down otherwise. It often crosses 100% and even goes beyond upto 150% sometimes(!). I ran Firefox in ...
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71 views

Why my desktop Ubuntu system has lag when CPU is not full?

I have a desktop workstation installed with Ubuntu 14.04. It has i7-5820 CPU, 6 cores 12 threads. When I run my 10-threads code which takes up 80-90% CPU usage. (See monitoring statistics below). I ...
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172 views

how to make cpugovernor intel_pstate stable?

I am trying to set to a specific frequency in cpu governor. However, I am not being able to do so. My processor is 12*Intel(R) Xeon (R) CPU E5-2620 v3 @2.40 GHz With intel_pstate driver it gives ...
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2answers
2k views

CPU benchmarking utility for Linux

I am looking for a utility that will benchmark CPU performance under single and multi threaded instances. At present I have an old rig with a dual core CPU (E7500) at 3.6 Ghz and I am looking at ...
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147 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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1answer
455 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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1answer
130 views

what could possible take 100% cpu but not show up in (sudo) top

When I start intellij, which loads an "haxe" project at startup, it sometimes happens that intellij hangs loading. I than start htop (also tried top) with "sudo". iotop is also not showing anything ...