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>
next in thread | previous in thread | raw e-mail | index | archive | help
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
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?4E3D808F.1030101>