QUEUEDEFS(5) Standards, Environments, and Macros QUEUEDEFS(5)

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(8). 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(8) 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(8)


March 1, 1994 QUEUEDEFS(5)