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Full Discussion: Running a process based on time
Top Forums Shell Programming and Scripting Running a process based on time Post 302478555 by DGPickett on Wednesday 8th of December 2010 08:44:00 AM
Old 12-08-2010
Yes, this is the toe of the "I wish I had a scheduler" problem, where you need to control and track many things running periodically, more elaborately than cron, be able to layer schedules, stop scheduling, run later or rerun tasks that can be focused on their original time(s) and restart running tasks that are truly real time, possibly with an immediate run off-cycle to minimize the gap. For instance, disk cleanup tasks are in the latter group (real time), and shift reports are in the former group (can have a date and shift as arguments, make aggregate rows in a db for one shift). If the maintenance takes 10 hours not 8, you do not want things taking off after 8, as the cleanup may take hours. Then, there is the possibbility of creating job dependencies, so b for today does not run until a for today and b for yesterday run OK. You can even have it mark dependent jobs not run if you mark a run as defective, automating catch up reruns. Optimally, it also provides you with a database of run times and outlooks that can drive scheduling choices and resource management as well as reruns, perhaps after a problem is fixed, and even load factors to drive smart scheduling.
 

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LEARN ABOUT SUNOS

queuedefs

queuedefs(4)							   File Formats 						      queuedefs(4)

NAME

       queuedefs - queue description file for at, batch, and cron

SYNOPSIS

       /etc/cron.d/queuedefs

DESCRIPTION

       The queuedefs file describes the characteristics of the queues managed by cron(1M). Each non-comment line in this file describes one queue.
       The format of the lines are as follows:

	      q.[njobj][nicen][nwaitw]

       The fields in this line are:

       q	The name of the queue. a is the default queue for jobs started by at(1); b is the default queue for jobs  started  by  batch  (see
		at(1)); c is the default queue for jobs run from a crontab(1) file.

       njob	The  maximum  number of jobs that can be run simultaneously in that queue; if more than njob jobs are ready to run, only the first
		njob jobs will be run, and the others will be run as jobs that are currently running terminate.  The default value is  100.

       nice	The nice(1) value to give to all jobs in that queue that are not run with a user ID of super-user.  The default value is 2.

       nwait	The number of seconds to wait before rescheduling a job that was deferred because more than njob jobs were running in  that  job's
		queue, or because the system-wide limit of jobs executing has been reached.  The default value is 60.

       Lines beginning with # are comments, and are ignored.

EXAMPLES

       Example 1: A sample file.

       #
       #
       a.4j1n
       b.2j2n90w

       This  file  specifies that the a queue, for at jobs, can have up to 4 jobs running simultaneously; those jobs will be run with a nice value
       of 1.  As no nwait value was given, if a job cannot be run because too many other jobs are running cron will wait 60 seconds before  trying
       again to run it.

       The  b  queue, for batch(1) jobs, can have up to 2 jobs running simultaneously; those jobs will be run with a nice(1) value of 2.  If a job
       cannot be run because too many other jobs are running, cron(1M) will wait 90 seconds before trying again to run it. All	other  queues  can
       have up to 100 jobs running simultaneously; they will be run with a nice value of 2, and if a job cannot be run because too many other jobs
       are running cron will wait 60 seconds before trying again to run it.

FILES

       /etc/cron.d/queuedefs	       queue description file for  at, batch, and  cron.

SEE ALSO

       at(1), crontab(1), nice(1), cron(1M)

SunOS 5.10							    1 Mar 1994							      queuedefs(4)
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