-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 On 10/15/12 15:21, Xin Li wrote: > On 10/15/12 13:52, Garrett Cooper wrote: >> On Mon, Oct 15, 2012 at 1:44 PM, Ian Lepore >> <free...@damnhippie.dyndns.org> wrote: >>> On Mon, 2012-10-15 at 22:26 +0200, Pawel Jakub Dawidek wrote: >>>> On Mon, Oct 15, 2012 at 08:21:50AM +0000, Maxim Sobolev >>>> wrote: >>>>> Author: sobomax Date: Mon Oct 15 08:21:49 2012 New >>>>> Revision: 241576 URL: >>>>> http://svn.freebsd.org/changeset/base/241576 >>>>> >>>>> Log: Add per-second scheduling into the cron(8). Right now >>>>> it's only available via the new @every_second shortcut. >>>>> ENOTIME to implement crontab(5) format extensions to allow >>>>> more flexible scheduling. >>>>> >>>>> In order to address some concerns expressed by Terry >>>>> Lambert while discussing the topic few years ago, about >>>>> per-second cron possibly causing some bad effects on >>>>> /etc/crontab by stat()ing it every second instead of every >>>>> minute now (i.e. atime update), only check that database >>>>> needs to be reloaded on every 60-th loop run. This should >>>>> be close enough to the current behaviour. >>>>> >>>>> Add "@every_minute" shortcut while I am here. >>>> >>>> Do I read the code correctly and the cron deamon will wake >>>> up every second now even if @every_second is not used at >>>> all? >>> >>> It appears to, which I don't think is a bad thing at all. But >>> the way it waits is to wake up, do some work, and go back to >>> sleep for an integer 1 second. That will occasionally lead to >>> a second in which no wakeup happens, as the "do some work" >>> part always takes some fraction of a second. > >> This is silly. It should be waking up at the lowest common >> denominator of time quanta, not every second; this could be >> determined via the crontab its managing. > > This will break crontab change detection -- instead of pickup the > change in a minute, now you end up with the smallest common > divisor. *greatest > BTW it seems that I need to clean dust on my forever WIP cron > update sooner :-/ > > Cheers, >
- -- Xin LI <delp...@delphij.net> https://www.delphij.net/ FreeBSD - The Power to Serve! Live free or die -----BEGIN PGP SIGNATURE----- iQEcBAEBCAAGBQJQfI0cAAoJEG80Jeu8UPuz4awH/jO2L6/aA7ocMQYGaT+epiOg XqfbhcnvmzI5X1Fgjx5rJI+B8bO2r9HCcuvwYq3RFRPdEUQPG3HGHKWnYACV6Sz2 Zkjx+mks0GdB413W5A2aX09BHe/9bT7aZ01SvHppvMkILuXn0tXJtaNE4YB7S8Df r1idCHX0hJnJl4WHqUl/AndKMtx1Nh2AfrlwubLc1W4XyTkPXMv1v2FZ3OjtgUJy byEnQZIISuSHE9S8rExCJdYUzkuwEZAMijc4v32e+2ZYFyvIYVdS1hiujnrmoIxm gCE/ZV8G4VGq8MX2/4FGGfQLetWelZCm9ogJaPpGvhfCY6PU8GUj5Ovs7pkzSA4= =IurG -----END PGP SIGNATURE----- _______________________________________________ svn-src-head@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
