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Full Discussion: Background Process Shell Scripting
Top Forums Shell Programming and Scripting Background Process Shell Scripting Post 302184701 by aigles on Saturday 12th of April 2008 01:43:41 PM
Old 04-12-2008
The following script show a possible way (the SUBMIT_JOB_LIMIT is set the maximun instance count) :

Code:
#!/usr/bin/bash
#submit_jobs

the_job() {
   echo "$(date +%T) - Start of job $1"
   sleep $((RANDOM % 30))
   echo "$(date +%T) - End   of job $1"
}

SUBMIT_JOB_LIMIT=5
SUBMIT_JOB_SLEEP=5

submit_job() {
   job_act=$(jobs | wc -l)
   while ((job_act >= $SUBMIT_JOB_LIMIT))
   do
      sleep $SUBMIT_JOB_SLEEP
      job_act=$(jobs | wc -l)
   done
   (( job_cnt += 1 ))
   the_job $job_cnt &
}

for ((i=1; i<=10; i++))
do
   submit_job $i
done

An execution example :
Code:
$ submit_jobs
19:37:38 - Start of job 3
19:37:39 - Start of job 4
19:37:39 - Start of job 5
19:37:38 - Start of job 1
19:37:38 - Start of job 2
19:37:40 - End   of job 1
19:37:45 - Start of job 6
19:37:47 - End   of job 3
19:37:51 - Start of job 7
19:37:52 - End   of job 2
19:37:55 - End   of job 6
19:37:56 - Start of job 8
19:37:56 - Start of job 9
19:37:58 - End   of job 4
19:37:59 - End   of job 5
$ 19:38:02 - Start of job 10
19:38:06 - End   of job 9
19:38:14 - End   of job 8
19:38:20 - End   of job 7
19:38:29 - End   of job 10

Jean-Pierre.
 

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LEARN ABOUT XFREE86

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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