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 simultane-
ously 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 run-
ning 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 try-
ing 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 try-
ing 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)
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