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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30 views

High CPU with web streaming videos

Every time I start watching some video within a browser (both Firefox 40.0 and Chrome 44.0.2403.157 64-bit with no extensions) the CPU usage gets 100% (according to htop and system monitor) freezing ...
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13 views

Installing 13.04 with a heating CPU [on hold]

So, i have had Ubuntu 10.10 for a while now, and i never changed it. The problem is, my CPU heats really fast. It can last long if i dont run anything that uses a lot of memory. Dont tell me to change ...
0
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0answers
49 views

How to turn on AMD Turbo Core for AMD A6 6310 on Linux?

I use Lubuntu 15.04 I've noticed that my processor (AMD A6 6310) works at 1800 MHz frequency and not more, while AMD promised 2,4 GHz with Turbo Core option. How to enable Turbo Core option? $ ...
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0answers
22 views

gnome-keyring-d uses CPU too much

I'm using 14.04 LTS and always monitoring how much CPU resources are used by processes. gnome-keyring-d always attracts my attention by using too much CPU - almost 10%. After about 5 minutes OS ...
1
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0answers
36 views

CPUpower sets the frequency by itself

Whenever I try to change the governor or CPU frequency with CPUpower, after 10-20 seconds it starts to go up again.Lets say I set the maximum CPU frequency to 1.5GHz it will go to 1.76GHz and then to ...
4
votes
1answer
118 views

How do I diagnose a sudden slowdown

Running a particularly compute-intensive task on my computer (Tecra W50) for more than a few seconds causes it to become very slow. Performance does not return to normal after the task completes. ...
5
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0answers
62 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 ...
0
votes
1answer
42 views

GUI for monitoring CPU usage (including L1/L2 caches) in real time?

Is there any GUI available in Ubuntu which shows detailed CPU usage, including L1/L2 cache usage? So that while running a custom program, I can monitor the CPU utilization in detail. The default ...
4
votes
1answer
201 views

My laptop is seriously overheating

I installed Ubuntu 15.04 alongside Windows 7 on my laptop about an hour ago, and within two minutes of running Ubuntu (both during the Live CD and post-install), my CPU temperatures reach 100°C. In ...
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0answers
16 views

Slight stutter navigating Ubuntu

Ubuntu newbie here, I am on Dell Xps 15z, and have installed bumblebee and all that jazz to get my graphics to work. I also installed TLP and CPUFreq. The problem I have is that when I'm navigating ...
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0answers
34 views

100% CPU usage bugs

I am affected by a series of bugs in which some program starts to run using the 100% of the cpu. Among these programs, compiz indicator-bluetooth cups udisks update-apt-xapi This started a couple ...
1
vote
2answers
67 views

Increase processor utilisation of one application/program

I use ClustalX to align few unusually big sequences on my home desktop, this takes more than a week to complete and runs well below the maximum capacity of the machine. The top | grep clustalx gives ...
1
vote
1answer
152 views

Should I activate the additional driver: Processor microcode firmware for Intel CPUs for intel-microcode

I have recently noticed that there is an additional driver called Unknown: Unknown here which was not there before: I have already read this, and understand why it is there, but my question is, ...
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vote
0answers
43 views

Experiencing kernel panics, freezing and network errors. Please help!

I've had my own home server now for approximately 4,5 years and it's been running fairly smooth except for some disk breakdowns etc. Although, at various times I've been having issues where the server ...
2
votes
0answers
70 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 ...
2
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0answers
37 views

Debugging kernel running on AMD target from Intel host - how to return control to gdb?

I have compiled kernel 3.13.0-55 on Ubuntu on both AMD and Intel machines. I tried to copy compiled kernel to Intel target but it won't boot with that one. Therefore I have compiled the same version ...
0
votes
0answers
97 views

Proprietary Intel driver for processor microcode firmware seems to disable overclocking

I installed Ubuntu 14.04 on Asus B85M-G motherboard with G3258 CPU. This CPU has good overclocking possibilities and I was able to overclock it without hassle. Due to minor issues with hibernation and ...
0
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0answers
73 views

ffmpeg and libx264: Extremely high CPU temperature

Ahoy there! I turned my previous gaming rig into an Ubuntu Server 14.04 a year ago, and have been using it as a private nginx-rtmp live streaming server. Today I started to dabble with ffmpeg for ...
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0answers
50 views

CPU usage becomes extremely high after opening laptop lid after upgrading to kernel 3.19

So I recently upgraded my kernel to 3.19, and now, whenever I close my laptop's lid and re-open it, the CPU usage will spike to ~75% on all four cores of my CPU. However, Activity Monitor doesn't list ...
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0answers
25 views

CPU usage spikes to 75% and stay there after resuming from sleep mode?

So I recently upgraded my kernel to 3.19 (as part of a failed GNOME install that I have since undone), and now, whenever I close my laptop's lid and reopen it, CPU usage will spike after to minute or ...
6
votes
1answer
126 views

Ubuntu not recognizing all CPU cores

I'm not new to Linux but I'm not an expert either, so bear with me if this is a stupid question. We're running Ubuntu 14.04.2 from a live session USB to test out a new dual CPU workstation. It has ...
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3answers
278 views

15.04 Only Boots in Recovery Mode After CPU Change

I moved from an FX-6300 to an i5-4690k so I could have an ITX-size computer, and transplanted both the hard drive and the GPU. Gnome wasn't very happy about this, so now when I try to boot normally, ...
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2answers
70 views

Check CPU and other hardware components in Lubuntu [duplicate]

Tell me please which are the best ways to check the temperature of the CPU and other hardware components in Lubuntu? It would be better if the applications could even tell me which are the normal ...
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vote
2answers
294 views

How can I set the CPU frequency to always stay at its maximum?

Since I mostly use my laptop as a desktop, I'm trying to set its CPU to its maximum frequency. The CPU is an Intel Core i5-3337U (dual-core with Hyper-Threading), which caps at 2.5GHz (with 2 active ...
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0answers
65 views

Why is my Ubuntu running so slow?

AMD E2-1800 APU with Radeon(tm) HD Graphics × 2 4GB Memory (3.5 Usable) Gallium 0.4 on AMD PALM 64 Bit I know I have a slow processor but that shouldn't make my system run as slow as it is, even If I ...
1
vote
1answer
59 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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0answers
48 views

PCManFM and Nautilus 100% CPU usage

PCManFM and Nautilus take 100% of CPU (each one about 50%) I am on Ubuntu 14.04.2 LTS with lubuntu-desktop. Note that at start, Nautilus doesn't take anything, but takes 50% all the time once a window ...
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3answers
563 views

High System Load, Low CPU/RAM Utilization on Ubuntu 15.04

not really a system administrator here but really trying to just set up a server (a rented VDS, really) for some friends. I recently transferred basically game servers/MySQL/web sites over from one ...
2
votes
1answer
310 views

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 ...
0
votes
1answer
26 views

Dell D630 T7100 only 3 CPU Freq Steps

In my Dell D630 with a T7100 CPU i only get 3 FREQ-Steps : 800 Mhz, 1,2 GHz, 1,8 GHz but i want more as my other device with a T8300. How can i change it ? I want to have 400 MHz , 600 MHz, 800 MHz, ...
0
votes
1answer
60 views

Whats the meaning of CPU% for each process in top command?

I was running some heavy processes inside a VM and then I used top command to see how much loaded the system is. Overall CPU showed 29% while CPU% for qemu showed 133%. %CPU definition from top man ...
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0answers
51 views

CPU number differs in 'About this computer' and /cpu/cpuinfo

Question: I'd like to ask what may cause that there are two different informations about the number of processors. See the reports below. System dialog: If open the System settings/Details tab ...
0
votes
0answers
35 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 ...
1
vote
0answers
106 views

How to disable cpu frequency scaling on MacBook Air

I am having problems disabling CPU frequency scaling on a MacBook Air 6,1 (dual core 1.4 GHz i5-4260U with hyperthreading) laptop with ubuntu 14.04. I need to disable the frequency scaling to install ...
2
votes
0answers
327 views

Why aren't all of my CPU cores always detected in ubuntu 14.04 with an Intel Core Duo 2 CPU?

I'm using Ubuntu 14.04.2 LTS with kernel 3.16.0-38-generic #52~14.04.1-Ubuntu SMP Fri May 8 09:43:57 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux. Computer model: iMac Late 2009 ( ...
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vote
0answers
80 views

Ubuntu crashes frequently

I recently moved from Windows to Ubuntu 14.04LTS 64-bit OS. Initially everything worked really well. However for the last couple of weeks Ubuntu started behaving crazy. The transition from good to ...
5
votes
1answer
553 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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0answers
31 views

Ubuntu equivalent of windows 8 processor power management and system cooling policy?

what is the equivalent in Ubuntu of processor power management and system cooling policy that you would find in windows 8 ? thanks
0
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1answer
36 views

Pin virtualbox to core(s) on precise pangolin (12.04)

I'm trying to pin VirtualBox to a few cores with taskset like so: /usr/bin/taskset -c 1-3 VirtualBox &; disown But the taskset has no effect. I have verified that taskset works with processes ...
0
votes
1answer
98 views

My cpu slows down after a while and does not recover

Sometimes, and I can't reproduce it (but it happens often enough - a few times a week at least) my cpu slows down below its prescribed minimum. This is an example cpufreq-info output from a minute ...
1
vote
1answer
24 views

Will replacing Windows 8.1 with Ubuntu limit processor fearures?

I've bought a Lenovo Thinkpad Edge E540 and am intending to replace the pre-installed Windows 8.1 with Ubuntu. Will I be able to make use of processor technologies, such as Hyperthreading, VT-x etc., ...
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0answers
79 views

Machine Check error using Nvidia drivers on 15.04

Hwæt, Hardware specs: CPU: AMD FX 8350 8-core GPU: Nvidia GeForce GT 630 Motherboard: ASUS M5A78L-M/USB3 A few weeks ago, under Trusty Tahr, I started having graphics problems. Several bad ...
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vote
0answers
144 views

Firefox eventually for no aparent reason consumes all CPU and RAM and grinds to a halt pulling my computer along with it

I now use Firefox as my default browser and have found that after having it up and running for several hours, that it starts to use up more and more of my CPU and RAM, and this does not appear to have ...
0
votes
0answers
251 views

Dell XPS 13 2015 CPU performance on battery

I recently purchased a Dell XPS 13 with Ubuntu (i5 5200U CPU @2.7GHz) and I detected that system works slow on battery mode. cpufreq-info says: ... analyzing CPU 0: driver: acpi-cpufreq CPUs ...
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2answers
42 views

indicator-cpufreq disappearing from top bar

When I run indicator-cpufreq it shows the icon but when I leave the terminal it removes it. How can I make it permanent ?
0
votes
2answers
78 views

How to make cpupower not reset after each restart?

I use this command sudo cpupower frequency-set -u 1.5G To make the max CPU frequency to 1.5GHz but after restart it sets it back to default. How can I set this at boot ?
0
votes
3answers
471 views

Disabling Intel Turbo Boost in ubuntu

I'm new to Ubuntu and want to disable the turbo boost. I tried with cpufreq but i cant get it to work. is there any other way to do it. In windows it was as easy as changing the CPU speed from 100 ...
2
votes
0answers
54 views

14.04 - How to use integrated CPU graphics with NVIDIA driver?

I'm running Ubuntu 14.04, and am having some graphics troubles. Basically, what I want to do is have the NVIDIA driver installed, while still use CPU graphics for the display, and have my NVIDIA ...
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1answer
94 views

CPU frequency limit to 2000 on battery

I want set frequency to 2100 in battery mode but it have limit to 2000. I ran tlp ac and change CPU frequency with indicator-cpufreq to 2100 (and also check Performance) then check frequency with ...
0
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0answers
77 views

Is there an Ubuntu alternative for CPU core parking manager

Is there a Ubuntu alternative for CPU core parking manager (for windows) http://coderbag.com/Programming-C/CPU-core-parking-manager ? For my OpenGL app some CPUs will try to throttle and then start ...