-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 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. 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----- iQEcBAEBCAAGBQJQfIxrAAoJEG80Jeu8UPuz8AEH/RHsUiCrbjws2GwyNcIn2Qz5 JEkmK4SAvMigIok2JZNyuKtP/6j9wmhk6EtuDLV9s196hdarfBPl/JJcv7x+JM/W OTOtJuh8i59bTNSSUPVUlgEpXXh8I77CfVO3RfadcchCMzkhUuonHGpgqVflYS4n LbjJEbZMrGq7JSat3kjUX6bU+jOb2cA1Ieoe9ykp3vsFZWHFeAimMzPcH/knO/wi M9YgzO4mfuATYUDDcj6Istvm2O3mwsftPwTPCe2RUov5fvWG05InygwqglaYtvx9 e6tKYqbwbd+kVr9ZOLVc9Izk51b3pATDuItYDSXUyI2DW8ymsgvvdk2vOkZfDnQ= =q1rQ -----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"
