0
votes
0answers
14 views

What is kworker and why is it using almost 100% of the first cou core? [duplicate]

I know this question is asked several times, but I don't find a solution (if there is any) I have a samsung series 7 CHRONOS laptop. CPU - Intel® Core™ i7-3635QM CPU @ 2.40GHz × 8 I'm on Ubuntu ...
6
votes
1answer
1k views

check-new-release process eating up resources on Ubuntu server 13.04

A small Ubuntu 13.04 virtual machine instance I run in a cloud environment regularly becomes slow/unresponsive because of a proces called check-new-release. Is there any way to disable this process ...
1
vote
0answers
68 views

How to investigate scheduler issues?

I have a server process that should runs multiple threads at close to 100%, each on its own CPU. When I run the process on a RHEL box, the CPUs in question appear to stay pegged at 100%, according to ...
4
votes
2answers
5k views

What is process “/usr/bin/X :0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch -background none”?

I am experiencing some serious performance issues with my Ubuntu 12.04 setup and thus looking for the culprit by running htop alongside my usual tasks. Aside from the usual suspects like chromium, ...
1
vote
0answers
238 views

unrar causes CPU spike and can't be killed [closed]

From time to time I see my CPU usage spike and my laptop starts to heat up. I run top and see that an unrar process is running and consuming anything from 40 - 99% of CPU capacity. I try to kill ...
1
vote
1answer
1k views

Why are Ksoftirqd -processes pushing my CPU-LOAD to 100%?

When I suspend or hibernate my laptop, the Ksoftirqd/0 or Ksoftirqd/1 process runs on 100% continuously. I have to reboot or shutdown my laptop then. This happens in Ubuntu 10.04, 10.10, 11.04 and ...
5
votes
3answers
825 views

Why % CPU doesn't add up to 100?

Why doesn't the "% CPU" in System Monitor add up to 100? (% CPU is the third column on the following screenshot)
5
votes
1answer
7k views

'htop' does not show the correct CPU%, but 'top' does

While running mencoder with threads=4 (on a quad-core cpu). I've noticed that htop does not show its true CPU usage, but top does. It seems that htop is only reporting on one core. Is this a ...
26
votes
3answers
64k views

Why is ksoftirqd/0 process using all of my CPU?

I was feeling Ubuntu was running a bit sluggish, and then I went to see the processes running on it, and found one which was using something like 50% of CPU called ksoftirqd/0. Does anyone know what ...