Date: Tue, 24 Oct 2017 08:41:35 -0600 From: Alan Somers <asomers@freebsd.org> To: Borja Marcos <borjam@sarenet.es> Cc: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org>, freebsd-security@freebsd.org Subject: Re: Periodic jobs lockf timeout Message-ID: <CAOtMX2hb_Ur8XtTdoPju3ZQGMfJ_pApUKsZiaocxaG9n%2BDVycA@mail.gmail.com> In-Reply-To: <AEF2CF7D-BFAC-4ACE-95F2-EF5026E89959@sarenet.es> References: <AEF2CF7D-BFAC-4ACE-95F2-EF5026E89959@sarenet.es>
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On Tue, Oct 24, 2017 at 3:07 AM, Borja Marcos <borjam@sarenet.es> wrote: > > Hi, > > I’ve come across a problem with the “daily” security job. On an overloaded system with lots of ZFS datasets, > lots of files, heavy system load and, to add insult to injury, a ZFS crub going on the find’s issued by the > periodic checks can take forever. They can take so long, I have found several lockf’s waiting. > > Is it sane to have an unlimited timeout for lockf? Probably it would be better to have at least a configurable > timeout for each cathegory. It’s really unlikely to see an overlap for a weekly or monthly job, but for daily > jobs it would be good to have a sane default, say, an hour or two. > > There’s even a parameter on /etc/defaults/periodic.conf but it seems it’s not used right now. > > # Max time to sleep to avoid causing congestion on download servers > anticongestion_sleeptime=3600 > > > The alternative would be to have defaults for a sane timeout for each cathegory, like > > daily_lockf_timeout > weekly_lockf_timeout > monthly_lockf_timeout > > Thoughts? It’s pretty simple to do and overlapping periodic jobs are really useless. Are you talking about the lockf in /usr/sbin/periodic? It already has a timeout of 0, which should prevent overlapping periodic jobs. Or is there some other lockf involved? Without knowing which lockf you're talking about, I can't understand your problem. The anticongestion_sleeptime variable is unrelated to lockf. -Alan
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