Date: Sat, 06 Aug 2011 10:57:35 -0700 From: Yuri <yuri@rawbw.com> To: Alexander Best <arundel@freebsd.org> Cc: freebsd-hackers@freebsd.org Subject: Re: top(1) loses process user time count when threads end Message-ID: <4E3D808F.1030101@rawbw.com> In-Reply-To: <20110806091127.GA39951@freebsd.org> References: <4E3CC033.6070604@rawbw.com> <20110806091127.GA39951@freebsd.org>
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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. Yurihome | help
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