Date: Sat, 4 Sep 2004 00:33:27 -0300 (ADT) From: "Marc G. Fournier" <scrappy@hub.org> To: Don Lewis <truckman@freebsd.org> Cc: freebsd-current@freebsd.org Subject: Re: what is fsck's "slowdown"? Message-ID: <20040904003222.J812@ganymede.hub.org> In-Reply-To: <200409032158.i83LwdWg030214@gw.catspoiler.org> References: <200409032158.i83LwdWg030214@gw.catspoiler.org>
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On Fri, 3 Sep 2004, Don Lewis wrote: > On 3 Sep, Marc G. Fournier wrote: >> >> I'm running another fsck on a 4.x system ... I know 5.x brings in the >> background mode for it, which would definitely make my life easier, *but* >> ... when running fsck, it says its using up 99% of the CPU: >> >> # ps aux | grep fsck >> root 67 99.0 5.0 184252 184284 p0 R+ 12:46PM 254:16.68 fsck -y /vm >> >> now, its a dual CPU system ... on an MP system, is it not possible to have >> it parallelize on a file system, so that it makes use of all available >> CPU? >> >> For instance, right now, its in Phase 4 ... on a file system where ctl-t >> shows: >> >> load: 0.99 cmd: fsck 67 [running] 15192.26u 142.30s 99% 184284k >> /dev/da0s1h: phase 4: cyl group 408 of 866 (47%) >> >> wouldn't it be possible, on a dual CPU system, to have group 434 and above >> run on one process, while group 433 and below running on the second, in >> parallel? Its not like the drives are being beat up: > > Would the file system in question happen to be full of UNREF files that > fsck is deleting? mostly 'ZERO LENGTH DIRECTORY' ... ---- Marc G. Fournier Hub.Org Networking Services (http://www.hub.org) Email: scrappy@hub.org Yahoo!: yscrappy ICQ: 7615664
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