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Full Discussion: Keep a certain number of background processes running
Top Forums Shell Programming and Scripting Keep a certain number of background processes running Post 302280675 by awk on Tuesday 27th of January 2009 11:13:29 AM
Old 01-27-2009
I had a similar problem - submit up to and including four background jobs, and when one or more finish, built back up to the max.

Code:
while read LINE                          # go through the output file from the view one line at a time
do

### Commented a lot of code - but basically, based on the LINE, 
###   set up the job with export statements

###   the secret is the jobs command gives a list of background jobs to this process
###   then the wc -l tells me how many

###   if it is >= 4, it goes to sleep for 30 seconds, then checks the count again

    # getting here, we want to submit the job to run, up to the limit of 4 jobs running at one time
    # See if there are 4 jobs running right now
      while [[ $( jobs | wc -l ) -ge 4 ]]
      do
        echo_f going to sleep now at $(date)
        sleep 30
      done

      /avidyn/scripts/avd_runit_002.ksh 1>/dev/null 2>&1 &   # parameters are passed by the export statements

done < /avidyn/tmp/avd_runit_001_jobs_to_run.txt

###  Not show after the done, is a "wait" command, to wait until all background jobs are finished.

 

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LEARN ABOUT OSF1

queuedefs

queuedefs(4)						     Kernel Interfaces Manual						      queuedefs(4)

NAME

       queuedefs - Queue description file for at, batch, and cron commands

DESCRIPTION

       The  queuedefs  file describes the characteristics of the queues managed by cron or specifies other characteristics for cron.  Each noncom-
       ment line in this file describes either one queue or a cron characteristic.  Each uncommented line should be in one of the  following  for-
       mats.

	    q.[njobj][nicen][nwaitw] max_jobs=mjobs log=lcode

       The  fields  in these lines are as follows: The name of the queue.  Defined queues are as follows: The default queue for jobs started by at
       The default queue for jobs started by batch The default queue for jobs run from a crontab file

	      Queues d to z are also available for local use.  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 jobs ter-
	      minate.  The nice(1) value to give to all jobs in the queue that are not run with a user ID of superuser.  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 reached.  The maximum number of active jobs from all queues that  may  run  at  any  one
	      time.  The default is 25 jobs.  Logging level of messages sent to a log file.  The default is 4.	Defined levels are as follows:

	      level-code   level

		  0	   None

		  1	   Low

		  2	   Medium

		  3	   High

		  4	   Full

       Lines beginning with # are comments, and are ignored.

EXAMPLES

       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 running, 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.  b.50j20n60w

       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.  max_jobs=25 log=4 # This is a comment # And so is this

FILES

       Main cron directory The default location for the queue description file.

RELATED INFORMATION

       Commands: at(1), cron(8), crontab(1), nice(1)
       delim off

																      queuedefs(4)
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