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Full Discussion: Script to run 100jobs at a time from cron
Top Forums Shell Programming and Scripting Script to run 100jobs at a time from cron Post 302069080 by Perderabo on Wednesday 22nd of March 2006 01:37:11 PM
Old 03-22-2006
Unless you have 100 cpu's you are not going to execute 100 processes simultaneously. But you don't need to wait for one process to finish before launching a second process. Just use the ampersand.

#! /usr/bin/ksh
job1
job2
job3
exit 0

#! /usr/bin/ksh
job1 &
job2 &
job3 &
wait
exit 0

The first script runs the commands sequentially. The second one does not. Note that either script is counted as one job by cron, not 3 or 4 jobs. If it launched 10,000 subjobs, cron still counts it as one job. Depending on your version of unix, you may have a problem with another limit usually called maxuprc which is the max processes a non-root user can have. You may need to to increase that.
 

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LEARN ABOUT OSF1

uudemon

uudemon(4)						     Kernel Interfaces Manual							uudemon(4)

NAME

       uudemon.admin,  uudemon.cleanu,	uudemon.hour,  uudemon.poll  -	Administrative shell scripts for polling remote systems, cleaning up spool
       directories, reporting status to the system administrator, and routine invocations of the uuxqt and uusched daemons

SYNOPSIS

       These shell scripts reside in the following directory:
	  /usr/lib/uucp

DESCRIPTION

       All the scripts can be run from the command line or can be run automatically by the cron daemon. To automatically run the  scripts,  remove
       the comment character (#) from the beginning of the relevant line in the /var/spool/cron/crontabs/uucp file.

       This  script  reports  status  to  the system administrator. It issues the uustat command to find out the status of uucp jobs. It mails the
       results to the uucp login ID. The script may be modified to send mail to any login ID such as the uucp administrative login ID  (uucpa)	or
       root.  This script cleans up the /var/spool/uucp and /var/spool/uucppublic directories by running the uucleanup command. The uucleanup com-
       mand is run with the following parameters: -C7, -D7, X2, -o2, -W1.  This script runs the uusched and uuxqt daemons in the background.  This
       script  polls  the  systems  listed  in	the  /usr/lib/uucp/Poll file.  The uudemon.poll script should be scheduled before the uudemon.hour
       script. This allows uudemon.poll to create any command files before cron runs the uudemon.hour script.

FILES

       Contains the uudemon.admin, uudemon.cleanu, uudemon.hour and uudemon.poll files.  Contains the uucp file.

RELATED INFORMATION

       Commands: cron(8), uucleanup(8), uusched(8), uuxqt(1)

       Files: /usr/lib/uucp delim off

																	uudemon(4)
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