creation, context switch time of process and thread

From: liuzhiyou.cs@gmail.com (刘智猷)
To: kernelnewbies@lists.kernelnewbies.org
Subject: creation, context switch time of process and thread
Date: Thu, 24 May 2012 22:30:51 +0800	[thread overview]
Message-ID: <4FBE461B.1040408@gmail.com> (raw)
In-Reply-To: <CAF8DjXjjj75yM6d_4K-rj5U5OEA6t-UuHK=HRsTHRbjKdBCPxQ@mail.gmail.com>

On 05/24/2012 08:25 PM, Srinivas Ramanan wrote:
> Can someone give the  information of following typical values in 
> Kernel 3.x
> in a 2Ghz machine with sufficient RAM
>
> Process creation time ?
> Process context switch time ?
> pthread creation time ?
> pthread context swich  time ?
> kernel thread creation time ?
> kernel thread context swich  time ?
>
> What is the best way to measure these values?
> I wrote  a simple test for measuring kernel thread context switch
> A simple test like
>
> 1. get_time(start)
> 2. schedule();
> 3. get_time(end)
> 4. print( context sw time = (end-start) )
>
> But it doesnt seem to work correctly.
>
> Thanks.
> Ramanan
>
>
>
>
>
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Hi,

Check things supporting tracepoints like perf, systemtap and kprobe. 
They could help you a lot.

Regards,
LIU zhiyou
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