the 0th core cpu usage very high

Question

0.00/5 (No votes)

See more:

VB

Cpu0  : 68.9%us,  4.6%sy,  0.0%ni, 20.5%id,  0.0%wa,  1.0%hi,  5.0%si,  0.0%st
Cpu1  : 58.1%us,  4.3%sy,  0.0%ni, 33.6%id,  0.0%wa,  0.0%hi,  4.0%si,  0.0%st
Cpu2  : 56.1%us,  5.0%sy,  0.0%ni, 34.9%id,  0.0%wa,  0.3%hi,  3.7%si,  0.0%st
Cpu3  : 55.8%us,  4.0%sy,  0.0%ni, 36.2%id,  0.0%wa,  0.0%hi,  4.0%si,  0.0%st
Cpu4  : 53.0%us,  5.6%sy,  0.0%ni, 38.4%id,  0.0%wa,  0.0%hi,  3.0%si,  0.0%st
Cpu5  : 53.0%us,  5.6%sy,  0.0%ni, 36.8%id,  0.0%wa,  0.0%hi,  4.6%si,  0.0%st
Cpu6  : 54.0%us,  4.3%sy,  0.0%ni, 38.1%id,  0.0%wa,  0.0%hi,  3.6%si,  0.0%st
Cpu7  : 53.6%us,  4.6%sy,  0.0%ni, 37.4%id,  0.0%wa,  0.3%hi,  4.0%si,  0.0%st
Cpu8  : 49.8%us,  5.6%sy,  0.0%ni, 40.2%id,  0.0%wa,  0.0%hi,  4.3%si,  0.0%st
Cpu9  : 55.4%us,  5.0%sy,  0.0%ni, 36.3%id,  0.0%wa,  1.0%hi,  2.3%si,  0.0%st
Cpu10 : 54.3%us,  6.0%sy,  0.0%ni, 34.8%id,  0.0%wa,  0.0%hi,  5.0%si,  0.0%st
Cpu11 : 53.6%us,  6.3%sy,  0.0%ni, 36.4%id,  0.0%wa,  0.7%hi,  3.0%si,  0.0%st
Cpu12 : 55.0%us,  4.0%sy,  0.0%ni, 37.1%id,  0.0%wa,  0.0%hi,  4.0%si,  0.0%st
Cpu13 : 53.7%us,  4.0%sy,  0.0%ni, 38.7%id,  0.0%wa,  0.3%hi,  3.3%si,  0.0%st
Cpu14 : 52.8%us,  5.0%sy,  0.0%ni, 37.6%id,  0.0%wa,  0.0%hi,  4.6%si,  0.0%st
Cpu15 : 56.8%us,  4.0%sy,  0.0%ni, 34.9%id,  0.0%wa,  1.0%hi,  3.3%si,  0.0%st

The service process running on linux system of MIPS platform. The process had about 70 threads, 16 threads bond to the 16 cores, every core bond a single thread. The left threads do not bond operation. So from the result we can see that the 0th core's cpu usage very high. I doubt the linux system make the left threads running on the 0th core. So the 0th core's cpu usage very high. How can I handle this problem? Thanks.

Posted 1-Nov-12 21:25pm

gn7575

Add a Solution

Comments

Jochen Arndt 2-Nov-12 4:18am

Are some threads bound to specific cores by your application?
If so, remove the binding and let the kernel assign the cores to the threads.

gn7575 2-Nov-12 6:15am

Yes, the board has 16 cores, we bound 16 service threads to each cores. The other threads not bound. The 16 service threads do a lot of work. The other threads just auxiliary.

Jochen Arndt 2-Nov-12 6:22am

Just try it without binding and compare the loads. The kernel usually makes a good switching job. You may also give the service threads a higher priority than the auxiliary threads and/or lower the priority of the aux threads.

nv3 2-Nov-12 4:35am

I don't think that a slightly higher CPU usage on core 0 is so unusual. System processes or an uneven distribution of the remaining threads might easily cause that. As Jochen said, better leave the distribution of threads to cores to the operating system, except you know very well what you are doing.

gn7575 2-Nov-12 6:26am

You are right, but some time it will make some problem.

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Mehdi Gholam · Answer 1 · 2012-11-01T22:10:00

Solution 1

Generally the threads within an application will execute on a single CPU because of the complexities of managing shared memory and instruction pipe lining.

If you execute 2 or more processes then you will see more usage on other CPU's.

Posted 1-Nov-12 22:10pm

Mehdi Gholam