QUEUEDEFS(4) QUEUEDEFS(4)
queuedefs - at/batch/cron queue description file
/usr/lib/cron/queuedefs
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(1);
c is the default queue for jobs run from a crontab file. The
name must be a lower case letter.
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. Valid nice values are 0
to 19. 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 more than 25 jobs were running in all
the queues. The default value is 60.
Lines beginning with # are comments, and are ignored.
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 jobs, can have up to 2 jobs running
simultaneously; those jobs will be run with a nice value of 2. If a job
cannot be run because too many other jobs are running, cron 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
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QUEUEDEFS(4) QUEUEDEFS(4)
will wait 60 seconds before trying again to run it.
/usr/lib/cron/queuedefs
cron(1M)
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