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 determine if CPU VT extensions enabled in bios?

I know the command to figure out if a CPU can support VMware Workstation 8 or VMware Player 4: $ grep flags /proc/cpuinfo flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov ...
3
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1answer
66 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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1answer
462 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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2answers
189 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 ...
0
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1answer
34 views

ubuntu 14.04.2 on VM Machine in Windows 8

I have installed Ubuntu 64 bit with the same version on VM machine but it works very slowly. I have gave 2GB ram and 1 Processor to it. But after a little search i came to know 32Bit will work better ...
6
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5answers
7k views

Dropbox very high CPU usage without any actual data transfer

The Dropbox process constantly clocks more than 50% CPU usage sometimes going up to the higher 80s and 90s. At the same time it does not even upload/download the files it is supposed to. The progress ...
20
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5answers
161k views

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 ...
5
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0answers
45 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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0answers
57 views

how can I get Ubuntu to use MORE of of my CPU power? [closed]

My laptop is a Lenovo B750 quad-core machine Intel® Core™ i3-2350M CPU @ 2.30GHz × 4 However, except in unusual circumstances (eg: opening very large files in Geany, or javascript bugs/loops in a ...
0
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1answer
21 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 ...
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2answers
618 views

Nvidia 331 driver, Ubuntu 14.04 and Wine - lags, fps drops and surprising, temporary boost

I experience weird fps drops while playing games, mostly with Wine. Some tested games: Hearthstone - fps drops happens pretty often; interesting fact is that while browsing cards every page needs ...
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2answers
60 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 ...
4
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1answer
124 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 ...
6
votes
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 ...
0
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0answers
11 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 ...
2
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2answers
2k views

Can I install a 64-bit version of Ubuntu on my 32-bit machine?

I have 3 GB of RAM. lscpu Architecture: i686 CPU op-mode(s): 32-bit, 64-bit
0
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0answers
28 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 ...
0
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2answers
307 views

Overclocking with Ubuntu

I overclocked my CPU in BIOS using a multiplier. Everything in Ubuntu still shows the CPU frequency is stock. Is the CPU running at stock frequency, or is it overclocked like it's supposed to be? Is ...
7
votes
3answers
771 views

Can't start Ubuntu - Package power limit notification

I used Ubuntu 12.10 on my current laptop for a couple of weeks without problems... Now there is no way to start it. When I try to boot Ubuntu during the startup process I get this error: [CPU0]: ...
1
vote
1answer
82 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, ...
0
votes
2answers
3k 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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0answers
58 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 ...
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0answers
33 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 ...
0
votes
2answers
74 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 ?
2
votes
2answers
471 views

Why Ubuntu 15.04 with kernel 3.19.0-15 is using significantly more power?

I've recently upgraded to 15.04 and immediately noticed significantly faster battery depletion and warmer case. My MacBook Air 6,2 would easily hold 10-12 hours on battery power with Ubuntu 14.10 and ...
2
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0answers
30 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 ...
2
votes
1answer
189 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
0answers
55 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
votes
2answers
112 views

why does /proc/cpuinfo show a single processor on the BQ Aquaris phone?

phablet@ubuntu-phablet:~$ cat /proc/cpuinfo Processor : ARMv7 Processor rev 3 (v7l) processor : 0 BogoMIPS : 2072.57 Features : swp half thumb fastmult vfp edsp thumbee neon vfpv3 tls ...
111
votes
9answers
183k views
0
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0answers
54 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 ...
0
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0answers
36 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 ...
6
votes
1answer
104 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 ...
12
votes
5answers
1k 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 ...
0
votes
0answers
21 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 ...
1
vote
3answers
201 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, ...
1
vote
2answers
64 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 ...
0
votes
0answers
60 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
35 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 ...
1
vote
3answers
417 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 ...
0
votes
0answers
37 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 ...
0
votes
1answer
24 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
0answers
75 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 ...
0
votes
1answer
149 views

lightdm using too much of CPU resources

I am using ubuntu 12.04. The lightdm is taking too much amount CPU constantly. I have tried restarting the system many times, but no use. Please help. lightdm version : 1.2.3 Thanks Saravanan
0
votes
1answer
46 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 ...
52
votes
7answers
131k views

Kworker, what is it and why is it hogging so much CPU?

I recently upgraded to the Kubuntu Natty Beta 1 and I've been having a lot of issues with the process kworker. At moments it uses almost half my CPU. Also, strangely enough it seems to affect my USB ...
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0answers
43 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 ...
4
votes
1answer
527 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 ...
0
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0answers
30 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 ...
2
votes
0answers
211 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 ( ...