Date: Tue, 02 Jun 2009 19:19:49 -0400 From: Greg Larkin <glarkin@FreeBSD.org> To: Steve Bertrand <steve@ibctech.ca> Cc: Glen Barber <glen.j.barber@gmail.com>, "freebsd-questions@freebsd.org Questions -" <freebsd-questions@freebsd.org> Subject: Re: Set task priority Message-ID: <4A25B395.6060502@FreeBSD.org> In-Reply-To: <4A25B1DA.10201@ibctech.ca> References: <4A25B029.1030608@ibctech.ca> <4ad871310906021609y4b85025bwe16346b824df7bf3@mail.gmail.com> <4A25B1DA.10201@ibctech.ca>
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Steve Bertrand wrote: > Glen Barber wrote: >> Hi Steve >> >> On Tue, Jun 2, 2009 at 7:05 PM, Steve Bertrand <steve@ibctech.ca> wrote: >>> Hi everyone, >>> >>> I'm attempting to "mysqldump" a database on a box that is hovering near >>> max CPU and mem usage. >>> >>> When I run the command, other critical programs fail to respond causing >>> an 'outage-like' situation. >>> >>> Normally, this is a time-of-day task and will run happily later into the >>> night, but I want to run it now. >>> >>> What is the best way to set priority on my task in order to ensure it >>> completes as quickly as possible, but does not cause a situation where >>> other programs and their children can't respond? >>> >> You can use nice(1) or renice(1) to set priorities, but I/O and >> bandwidth will end up being your bottleneck. > > Thanks Glen, > > I'll have to play around a bit. Looking closer, it does appear to be a > disk I/O issue, but I figured that if I tried to prioritize the job, it > might ease-up on all system aspects. > > Cheers, > > Steve Hi Steve, I had the same situation here, and nice(1) wasn't cutting it for me. I finally switched to idprio(1): http://www.freebsd.org/cgi/man.cgi?query=idprio&sourceid=opensearch idprio 31 mysqldump ..... will run only when other processes are idle. That should prevent any further self-incurred DOS symptoms for you. Cheers, Greg - -- Greg Larkin http://www.FreeBSD.org/ - The Power To Serve http://www.sourcehosting.net/ - Ready. Set. Code. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFKJbOV0sRouByUApARAs7DAKC2+IC4xaB+ErFBlIAdhvoLd9isigCgr9Gc 8nScru/gfYcptK1EeFaekfI= =SS04 -----END PGP SIGNATURE-----
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