Date: Tue, 28 Aug 2007 07:41:33 +0300 From: Kostik Belousov <kostikbel@gmail.com> To: Robert Watson <rwatson@freebsd.org> Cc: Ganbold <ganbold@micom.mng.net>, "freebsd-current@freebsd.org" <freebsd-current@freebsd.org> Subject: Re: computer becomes slow when compiling something Message-ID: <20070828044133.GR2332@deviant.kiev.zoral.com.ua> In-Reply-To: <20070827231419.H30469@fledge.watson.org> References: <46D25242.10504@micom.mng.net> <20070827231419.H30469@fledge.watson.org>
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[-- Attachment #1 --] On Mon, Aug 27, 2007 at 11:14:58PM +0100, Robert Watson wrote: > > On Mon, 27 Aug 2007, Ganbold wrote: > > >I'm running FreeBSD 7.0-CURRENT with SCHED_ULE, INVARIANTS, WITNESS > >enabled kernel. > > Try the same thing again without INVARIANTS and WITNESS, both of which can > consume a lot of CPU in kernel on a very active system, especially if lots > of vnodes are being allocated and freed. Especially WITNESS. It does happens on the kernels without debug options, in particular, WITNESS and INVARIANTS. It happens when a lot of short-lived processes are rapidly created. Compilation is a good example of such workload; running configure script is even better. [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (FreeBSD) iD8DBQFG06d8C3+MBN1Mb4gRAqisAKDrMamxMNqS40/pe3ezT/xozB7bawCfSfrc 8QQz2WuOWQVqrtL0jyHFeRQ= =m33C -----END PGP SIGNATURE-----
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