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.
Questions tagged [cpu]
1414 questions
266
votes
20 answers
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) requires 700 MHz and VGA, but will an AMD Mobile…
user1610406
- 3,105
203
votes
6 answers
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 ports; whenever I plug in an USB drive, the…
davorao
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139
votes
3 answers
How/Where do I check my ubuntu laptops's CPU usage?
How/Where do I check my ubuntu laptops's CPU usage?
Lisa
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50
votes
3 answers
How to determine if CPU VT extensions are 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 pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht…
pcapademic
- 1,371
44
votes
3 answers
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 its actually a sum of usages across different…
Poonam Srivatava
- 461
40
votes
4 answers
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 to 99.
Ivaylo
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37
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2 answers
How to run a program with only one 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 but trick it into thinking I only have 1 CPU…
user245115
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votes
2 answers
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 desktop and it tells me the following:
Worse…
Oli
- 293,335
15
votes
3 answers
CPU number of cores seems not correct
As the image shows number of processors are 4.
But intel i5-4210U has only 2 cores as shown below. (Intel's own specs.)
So, if i5-4210U has only 2 cores than what is "4" indicating in the 1st pic?
lscpu gives this result:
Architecture: …
foxtrot9
- 557
14
votes
4 answers
High CPU usage even when no application is running(Desktop)
I always have high CPU usage in Ubuntu in every version of it that I have used. I have been using Ubuntu from 10.04 version.
My CPU usage even at idle is more than 30% for each core(unlike Windows 7 uses only 5%) due to which i'm getting my…
Murali Krish
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votes
1 answer
How to really check current cpu Hz?
All programs I've tried seem to be listing Hz from cpu's specifications not actually checking what the current Hz really is.
for example a processor is marketed with 4GHz.But this is the max (unless you over/under/clock) and if the cpu isn't doing…
fdsfgdsdf
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10
votes
4 answers
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.
LeoYuan 袁力皓
- 245
7
votes
2 answers
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 to make CPU work at the lowest level and so I…
Tim
- 25,177
5
votes
2 answers
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 interesting.
I can see that one of my cpus is used…
Nathan
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5
votes
2 answers
CPU overheating. What can I do?
I've experienced a few emergency shutdowns due to overheating. (Always while playing Minecraft) I checked what sensors would say me and I got this reply:
coretemp-isa-0000
Adapter: ISA adapter
Physical id 0: +52.0°C (high = +80.0°C, crit =…
s3lph
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