[EMAIL PROTECTED] writes:
> On Mon, 1 Dec 2008, Aleksey Tsalolikhin wrote:
>
>> Hi. I've got a Linux system that is spending more CPU time in system
>> than in user. sometimes more than double.
>>
>> I'd like to see what is the system call(s) that is chewing up the CPU.
>>
>> Is there any way to do that in Linux out of the box? I am afraid the
>> answer is no but I am hoping it's just a gap in my knowledge. Are
>> people using SystemTap? I really don't want to install some
>> expiremental kernel module...
>
> OProfile is one way to tell what system calls are being made. it's
> part of the standard kernel (although your distro may or may not have
> enabled it by default)
I have, previously, found this very valuable. It takes a bit of setup
effort, but can apply across more or less anything, and gives good
performance details.
To my surprise, I have also found the 'powertop' tool to be valuable in
finding out what is causing activity on the system, and reasoning from
that about where that causes load.
[...]
> what's your disk activity like? that can eat a _lot_ of CPU time.
My first guess was a PIO disk or similar, also.
Daniel
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