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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93
votes
7answers
152k views

How do I get the CPU temperature?

How do I get the CPU temperature.
51
votes
7answers
121k 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 ...
48
votes
6answers
77k views

Any way to check the clock speed of my processor?

Is there any way to check at which clock speed my processor is running? I have already tried cat /proc/cpuinfo but the clock speed I'm running isn't showing. I know Ubuntu 12.04 (Precise Pangolin) ...
29
votes
4answers
18k views

Is Ubuntu optimized for multicore CPUs?

Does Ubuntu make use of multicore CPUs (as Windows 7 is said to do)? In other words, is it multitasking optimized so that users will take benefit of 4+ core processors?
26
votes
6answers
24k views

Is it normal for compiz to consume 40% of my CPU with no other programs running?

When I have no other programs running, compiz takes up at least 40% of my CPU. Is this normal? If it is normal, is there anyway I could make this program take a smaller percentage?
25
votes
3answers
62k views

How/Where do I check my ubuntu laptops's CPU usage?

How/Where do I check my ubuntu laptops's CPU usage? I want to check it but I don't know where.... Thank you
19
votes
2answers
3k views

Run program with only 1 CPU core

I'm trying to run a bunch of scripts related to a gaming server in Terminator. The only problem is when I do this, Terminator detects all my CPU cores and the PC lags. Is there any way to start it up ...
18
votes
4answers
28k views

Why does kworker cpu usage get so high? [duplicate]

I recently installed Ubuntu 12.04 on my Samsung laptop alongside Windows 7. Whenever I use Ubuntu (even when its idle) kworker uses almost 90% of one of 8-cores. Even though it doesn't really affect ...
18
votes
5answers
153k 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 ...
17
votes
2answers
29k views

High CPU usage without a process to blame. What is [migration/x]?

For the past few days my computer has been revving its fans while not doing very much. I'm talking an instance of Firefox, gedit, few terminator windows and that's about it. I have conky running on my ...
15
votes
3answers
33k views

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 ...
15
votes
2answers
60k views

CPU temperature monitor for 14.04LTS?

Is there a way to configure psensor so the temperatures read out in real time in the panel so it could be read at a glance? So far, in order to read the temperature I have to click on the applet ...
15
votes
1answer
28k views

Adding a CPU monitor widget in the top corner like in Gnome2

I wonder if you can add a widget or something like it in the top corner (next to volume and WiFi and things like that) that displays current use of CPU and maybe RAM. I know you could add stuff like ...
14
votes
4answers
19k views

When will we get Sandy Bridge support?

I'd like to build a machine running Ubuntu and using the new Sandy bridge (i5 2500 specifically) intel cpu's. I heard that 10.10 doesn't have the best support (or simply won't work) with the new cpus ...
14
votes
2answers
2k views

Ubuntu 10.10 trash CPU overload

I have a weird bug with Ubuntu 10.10 on one of my computer. When I empty the trash, the process - gvfsd-trash goes to 200% and does not stop until I kill it (using kill -9). Does not matter if I have ...
13
votes
4answers
4k views

Reinstall of OS after CPU Upgrade needed?

I recently upgraded my CPU from an Athlon II X2 250 to the Athlon II X4 610E(45W 4 cores -- can't beat the efficiency). Is an ubuntu reinstall required?
12
votes
2answers
5k views

Maximum CPU frequency stuck at low value

I have observed a problem with Ubuntu 13.04. The problem was not there on 11.10 I used earlier. The maximum CPU frequency is stuck at 2GHzon my Intel(R) Core(TM) i7-2620M CPU @ 2.70GHz (Dell Lattitude ...
11
votes
2answers
3k views

Does Ubuntu support Core Parking?

Core parking is a new feature that introduced in Windows 7 to get better Battery performance . Depending on the resource use of the operating system it may park one or multiple cores of a multi-core ...
11
votes
3answers
909 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 ...
10
votes
4answers
9k views

100.0% usage by Audio codec hwC0D0: Realtek

I ran powertop, and it says that the Realtek audio codec is using 100.0% of the cpu. Is this a problem? I'm running Ubuntu 11.10 32-bit on Intel® Core™ i7 CPU M 640 @ 2.80GHz × 4 Sony VAIO laptop.
9
votes
4answers
8k views

What can I do to prevent Ubuntu from overheating my Notebook?

I have an easynote tj65 (2.1 ghz dual core with Geforce GT240M) running Ubuntu 11.10 and Windows 7 in dual-boot-mode. While Windows 7 doesn't have any comparable issues, Ubuntu is making my notebook ...
8
votes
5answers
28k views

How can I see how many processor cores are working?

I have quad-core processor system. I was using Windows before installing Ubuntu. Windows by-default was using 1 core* and I could change that with msconfig. How can I do this in Ubuntu or is it ...
8
votes
4answers
11k views

Dropbox is taking too much CPU time. How can I fix it?

I recently noticed that Dropbox is taking about 50-90% of my CPU for more than just a few seconds sometimes - mostly when downloading/syncing many or large files. Still, I guess that even when ...
8
votes
4answers
3k views

Is it possible to disable a CPU (not a core)?

Is it possible to disable a CPU, not a core? I want to do a test to verify if the performance could make a big difference or not. I'm using Ubuntu 10.10.
8
votes
1answer
4k views

How to use cgroup in ubuntu 13.04

I'm trying to learn how cgroup works on Ubuntu and seems that cgroup doesn't work in Ubuntu 13.04. I am using the answer to this question How to set cpu limit for given process permanently. Cpulimit ...
8
votes
1answer
5k views

How to control CPU fan with no pwm-capable sensors?

I've tried to follow the directions on this thread: How to control fan speed? But at the end of the day, pwmconfig gives me this error: /usr/sbin/pwmconfig: There are no pwm-capable sensor ...
7
votes
1answer
2k views

Does my computer have 1 or 2 CPUs? (cpuinfo and lscpu differ)

When I run cat /proc/cpuinfo I get the following output (only the relevant line included): cpu cores: 1 However, lscpu gives me the following output: CPU(s): 2 Which of the two is correct, and ...
7
votes
3answers
3k views

How do I analyze my CPU usage over a long period of time?

I am just wondering if there's any Ubuntu app that can track my CPU usage. The problem is that I am currently using a quad core i5, whilst what I do most in daily usage is just browsing and rails ...
7
votes
5answers
9k views

High Idle CPU temperature under Ubuntu, but not Windows

I have a Dell Inspiron Mini 1012 running Ubuntu 10.04 and Windows 7 Starter in a dual-boot configuration. The CPU runs much cooler in Windows than it does in Ubuntu, even when the CPU has been ...
6
votes
4answers
10k views

Getting Processor Information

I have just ran lshw to get some information about a machine I know nothing about, and I just wanted to confirm something. Does this basically mean it is a dual core 64 bit processor that is ...
6
votes
2answers
16k views

How do I monitor CPU core usage per thread?

I need this information to optimize the number of worker threads my custom application is allocating. For example, if I just use top on a single-threaded application on a two-core machine, the 100% ...
6
votes
5answers
10k views

watchdog/0 process using all my CPU suddenly

I have a fresh installation of Ubuntu 12.04, I have been running it for about a week. Suddenly today I noticed my computer freezes every 5 seconds. I restarted the computer and I still get this. I ...
6
votes
2answers
4k views

How do I assign different CPU cores to different processes?

I'm using Ubuntu Server Edition 11.10 and I have two extremely CPU intensive programs running on the same core. Neither of these processes were programmed for multi-core processing. Is there a way I ...
6
votes
1answer
3k views

How to fix that only one out of four cores of my CPU is detected?

I have an Acer Aspire M5640/M3640 PC, featuring a Intel Core 2 Q8200 (Quad-core) processor running Ubuntu 12.04. Now it seems to only recognize just one CPU core. lscpu outputs: Architecture: ...
6
votes
1answer
2k views

How to control CPU frequency

On Lenovo T400 and Ubuntu 10.10, I am using CPU Frequency Scaling Monitor 2.30.0 on the panel to show and control CPU frequency. My CPU frequency by default will change according to load. But I want ...
6
votes
1answer
1k views

High CPU when I open nautilus

Everything else works fine but when I open my home folder or move stuff around in it my cpu gets really high and everything slows down. This started to happen after upgrading to 11.10. Everything in ...
6
votes
2answers
155 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. ...
6
votes
2answers
754 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]: ...
5
votes
6answers
43k views

Intel Core i3 CPU is not 64 bit?

According to this page: https://help.ubuntu.com/community/32bit_and_64bit the following Intel CPU's are 64bit: Intel F and 5x1 series Pentium 4 using the "Prescott" core Pentium D Core 2 (Solo, Duo ...
5
votes
2answers
5k views

Are AMD processors less well supported than Intel processors?

I am looking to buy a new laptop, and as the Toshiba C660s seem to have small speakers, off-center keyboards and touchpads, and terrible "two-touch to zoom" feature, i am browsing Lenovo Ideapads. ...
5
votes
3answers
9k views

How I can disable CPU frequency scaling and set the system to performance?

My processor is running at 40% of its maximum speed, I want it to use 100% of the speed, all the time. I searched on Google but the tutorials are very old and they all differ. So, how can I ...
5
votes
1answer
517 views

Much lower temps on Ubuntu [closed]

I've noticed that CPU temps and GPU on my laptop are much lower on Ubuntu than Windows 7. On Windows temperature is like 50 celsius to 58 and on Ubuntu 40 to 50 max. Cooling is also much cooler on ...
5
votes
1answer
2k views

ubuntu 14.04 - only performance and powersave governor available (i5 4.gen)

After updating my ubuntu 13.10 to 14.04 there only these to govenors available for my cpu, instead of additionally ondemand and conservative. cat ...
5
votes
1answer
2k views

How to make “R” use all CPUs

I am using GNU R to calculate a huge dataset. My PC has 4 CPU-cores, and I can see, that R is using only 1 CPU. Is there a way to tell R to use all 4 CPUs in order to make the calculation complete ...
5
votes
1answer
2k views

How can I check if my computer has AES-NI support?

I've heard that disk encryption works reasonably faster when CPU supports AES-NI. How can I check if my CPU supports it? Does the Ubuntus default encryption (dm-crypt) use it by default or do I have ...
5
votes
1answer
5k views

Using quad core, but only 1 CPU entry in `/proc/cpuinfo`? Is SMP running on my computer?

I just upgraded my system and did a clean install of Ubuntu when I did (Installed Oneiric Ocelot from the CD last week but yesterday upgraded to 12.04 LTS). I have an i7 920 (quad core with ...
5
votes
2answers
780 views

fancontrol on no pw-capable machines

I've installed Ubuntu 13.4 on my Alienware m14x and noticed one thing, cpu gets as high as 70 degrees centigrade (with nothing resourceful running) and cooler doesn't respond to that, just stays calm ...
5
votes
2answers
4k views

Fan speed high since upgrade to 12.04

Since I have updated to 12.04 LTS my desktop pc's fan runs permanently with high speed and is annoyingly noisy. CPU temperature is low. Here is what the sensors command gets me: nouveau-pci-0400 ...
5
votes
1answer
2k views

Lenovo ThinkPad L520 slows down when AC power adapter is plugged in

I have a new laptop Lenovo ThinkPad L520 (7859-5BG) Core i5-2520M(2.5GHz) with 4GB RAM. Having installed Ubuntu 11.10 32-bit, while browsing with Chrome on GNOME classic (no effects), I noticed 173% ...
5
votes
4answers
13k views

Is there any version of Ubuntu that does not require PAE?

For the first time I tried to install Xubuntu 12.04 on my computer using the Grub4dos way. However, it stuck and showed "This kernel requires the following features not present on the CPU : PAE". I ...