CPU consumption

[Prashun Gupta]

All,
I have a application which is consuming 98-99% of cpu timings. Can anyone suggest the possible reasons for that, and the remedies of them.
Thanks
Prashun

[Pedro Sousa]

Prashun, could you post some more information? like:
- what's the application
- is it a process?
- some particular user?
- syslog messages?

generally: maybe restarting the app will solve it.

[John Bolene]

Reasons are:
it needs the cpu time (I run SETI processing which takes all of one processor)

it is in a loop somewhere (bad programming)

[Prashun Gupta]

Infinite loop possibility I am searching, can anybody suggest some method to detect that in code.
I have tried to put a time stamp,
Any other thing if you can tell
Prashun

[MANOJ SRIVASTAVA]

Hi Prashun

Do sar 2 10 and get the averages from there , where it shows the % of utilization in terms of or usr,sys,and i/o. Then if you have any indicators go from there and try with top , glance to know which processes are eating the CPU.

Manoj

[Dave Wherry]

Is there anything else running when this process runs? If it is not getting interupted by any other processes then it will just consume what ever is available. If it is hurting the performance of other processes when it runs then you have a problem.

[Prashun Gupta]

Hey Dave
Can you elaborate a little bit more
Prashun

[James R. Ferguson]

Hi Prashun:

Dave is absolutely correct. A single process with few interrupts (like waiting on an I/O to complete) can consume 100% of a processor, particularly in the absence of any competing processes.

There is not necessarily anything wrong with the code in a case like this.

More important than a percentage of the CPU consumed is the load average on your system. Use 'uptime' to see these values and/or use 'glance'. High load values (run queue depths) indicate contention for a processor (CPU). High CPU utilization alone may not be significant at all.

...JRF...