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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qrun(8B)								PBS								  qrun(8B)

NAME
qrun - run a pbs batch job SYNOPSIS
qrun [-a] [-H host] job_identifier ... DESCRIPTION
The qrun command is used to force a batch server to initiate the execution of a batch job. The job is run regardless of scheduling posi- tion, resource requirements, or state. In order to execute qrun, the user must have PBS Operation or Manager privilege. OPTIONS
-a Specifies the job(s) is to be run asynchronously. -H host Specifies the host within the cluster on which the job(s) are to be run. The host argument is the name of a host that is a member of the cluster of hosts managed by the server. If the option is not specified, the server will select the "worst possible" host on which to execute the job. OPERANDS
The qrun command accepts one or more job_identifier operands of the form: sequence_number[.server_name][@server] STANDARD ERROR
The qrun command will write a diagnostic message to standard error for each error occurrence. EXIT STATUS
Upon successful processing of all the operands presented to the qrun command, the exit status will be a value of zero. If the qrun command fails to process any operand, the command exits with a value greater than zero. SEE ALSO
pbs_server(8B), pbs_sched(8B), qmgr(1B) Local qrun(8B)