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From: John Baldwin <jhb@freebsd.org>
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Date: Mon, 9 Jan 2012 08:59:05 -0500
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	(bigwig.baldwin.cx); Mon, 09 Jan 2012 09:00:18 -0500 (EST)
Cc: Phil Kulin <schors@gmail.com>
Subject: Re: kproc_info system and user time is broken for processes with
	threads
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On Saturday, January 07, 2012 5:06:46 pm Phil Kulin wrote:
> kproc_info system and user time is broken for processes with threads,
> when fetch then by kvm_getprocs() function call.
> For example, modern 'ps' on server running mysqld (145 precached threads)
> 
> # ps -ax -o comm,cputime,systime,usertime | grep mysqld
> mysqld        16872:35.39 5249:07.68 3353:36.79
> # ps -ax -o comm,cputime,systime,usertime | grep httpd
> httpd        0:00.02   0:00.00   0:00.02
> httpd        0:00.00   0:00.00   0:00.00
> httpd        0:02.51   0:01.77   0:00.75
> 
> Sum systime+usertime=cputime for httpd, but different for mysqld.
> systime and usertime for mysqld not changed many times, but cputime 
increased.
> Modern ps uses ki_rusage.ru_stime and ki_rusage.ru_utime from
> kproc_info for systime and usertime statistic.
> 
> What wrong?

Hmm, I can't see anything that would explain this.  What if you
look at individual threads of mysqld (using 'H') flag?  Also, which OS
version are you using?

-- 
John Baldwin