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Shell Programming and Scripting

job/process scheduling or control

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Old 03-30-2008
job/process scheduling or control
Hi forum,

I have a problem concerning job or process scheduling and control.

I have to run 24 jobs (could be more sometimes less) of the same programme with different parameters. The machine this code is running on is an 8-core machine, so I was thinking that running all the processes at once would not be such a good idea because it would cause throttling between processes and some overhead. I could be wrong on this, feel free to correct me...

However, I don't seem to get my head around a way to control my batch of jobs/processes so that only 8 and always 8 processes are running (except at the end of the batch ofcourse).

in pseudocode it would have to look something like

for i in 1 to 24
x = get nr of jobs
while x < 8
start job i
done
done

however this stops if 7 jobs are reached. The while loop should be have a part that polls for the number of jobs and updates x, and re-enters the for loop if the condition is not met instead of exiting both the while and for loop.

Any pointers, ideas?
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LEARN ABOUT HPUX

proto

proto(4)						     Kernel Interfaces Manual							  proto(4)

NAME

       proto - prototype job file for at

SYNOPSIS

DESCRIPTION

       When a job is submitted to or the job is constructed as a POSIX shell script (see at(1)).  The job file is created in as follows:

	 o  creates a header describing the job as an job or a job.  jobs submitted to all queues other than queue are listed as jobs.	The header
	    is:

	    for an		job, or

	    for a		job.

	 o  A set of POSIX shell commands is added to make the environment (see environ(5)) for the job the same as the current environment.

	 o  then copies text from the prototype file to the job file, except for special variables that are replaced by other text:

	    Replaced by the current working directory.

	    Replaced by the current file size limit (see
		   ulimit(2)).

	    Replaced by the current umask (see
		   umask(2)).

	    Replaced by the time at which the job should be run,
		   expressed as seconds since January 1, 1970, 00:00 Coordinated Universal Time, preceded by a colon.

	    Replaced by text read by
		   from the standard input (that is, the commands provided to to be run in the job).

	 o  When a job is submitted to queue queue, uses the file as the prototype file if it exists.  Otherwise, it uses the file

EXAMPLES

       The following file creates commands to change the current directory, file size limit, and umask in the job to their  respective	values	as
       they existed when was originally run.  These commands are inserted before the commands in the job:

SEE ALSO

       at(1), queuedefs(4).

STANDARDS CONFORMANCE

																	  proto(4)