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Full Discussion: Crontab job queue
Top Forums UNIX for Dummies Questions & Answers Crontab job queue Post 302086012 by pksingh2 on Monday 21st of August 2006 10:24:34 PM
Old 08-21-2006
Crontab job queue
My cronjob triggers the script late by 6 minutes.
/var/cron/log shows that it got triggered at the right time then where can I track, the late starting of the script.
Is there some queue mechanism, some log?

This happens sometimes, not daily. but it affects me, whenever it happens.

Logging is there in the script. the script itself appears to be triggered late. The script captures the timestamp when it was triggered.

The issue seems to be in the queue.
Cron puts the job into the queue, but it gets picked up late.
Last edited by pksingh2; 08-22-2006 at 12:56 AM..
 

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LEARN ABOUT POSIX

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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