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Date: Sat, 06 Aug 2011 10:57:35 -0700
From: Yuri <yuri@rawbw.com>
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To: Alexander Best <arundel@freebsd.org>
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Cc: freebsd-hackers@freebsd.org
Subject: Re: top(1) loses process user time count when threads end
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On 08/06/2011 02:11, Alexander Best wrote:
> On Fri Aug  5 11, Yuri wrote:
>> I have the process that first runs in 3 threads but later two active
>> threads exit.
>>
>> top(1) shows this moment this way (1 sec intervals):
>> 30833 yuri            3  76    0  4729M  4225M nanslp  4   0:32 88.62% app
>> 30833 yuri            3  76    0  4729M  4225M nanslp  6   0:34 90.92% app
>> 30833 yuri            1  96    0  4729M  4225M CPU1    1   0:03  1.17% app
>> 30833 yuri            1  98    0  4729M  4226M CPU1    1   0:04 12.89% app
>>
>> Process time goes down: 0:34 ->  0:03. Also WCPU goes down 90.92% ->
>> 1.17% even though this process is CPU bound and does intense things
>> right after threads exit.
>>
>> getrusage(2) though, called in the process, shows the correct user time.
>>
>> I think this is the major bug in the process time accounting.
> could you check, whether kern/128177 or kern/140892 describe your situation?

I have ULE scheduler. kern/128177 talks about single thread with ULE 
scheduler, and my issue is with threads. So I am not sure if it is 
related. There have been no motion on kern/128177 since Feb 9, 2009.
kern/140892 is probably the same as mine.

In any case, both these PRs have to be fixed since they are very user 
visible, not just some obscure issues.

Yuri