queuedefs - Queue description file for at, batch, and cron commands
The queuedefs file describes the characteristics of the queues managed by
cron or specifies other characteristics for cron. Each noncomment line in
this file describes either one queue or a cron characteristic. Each uncom-
mented line should be in one of the following formats.
The fields in these lines are as follows:
q The name of the queue. Defined queues are as follows:
a The default queue for jobs started by at
b The default queue for jobs started by batch
c The default queue for jobs run from a crontab file
Queues d to z are also available for local use.
njob The maximum number of jobs that can be run simultaneously in the
queue; if more than njob jobs are ready to run, only the first njob
jobs will be run. The others will be initiated as currently running
nice The nice(1) value to give to all jobs in the queue that are not run
with a user ID of superuser.
nwait The number of seconds to wait before rescheduling a job that was
deferred because more than njob jobs were running in that queue, or
because the system-wide limit of jobs executing (max_jobs) has been
mjobs The maximum number of active jobs from all queues that may run at any
one time. The default is 25 jobs.
lcode Logging level of messages sent to a log file. The default is 4.
Defined levels are as follows:
Lines beginning with # are comments, and are ignored.
The following file specifies that the b queue, for batch jobs, can have up
to 50 jobs running simultaneously; that those jobs will be run with a nice
value of 20. If a job cannot be run because too many other jobs are run-
ning, cron will wait 60 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. 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 following file specifies that a total of 25 active jobs will be allowed
by cron over all the queues at any one time, and cron will log all messages
to the log file. The last two lines are comments that are ignored.
# This is a comment
# And so is this
Main cron directory
The default location for the queue description file.
Commands: at(1), cron(8), crontab(1), nice(1)