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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 OSF1

sched_getparam

sched_getparam(3)					     Library Functions Manual						 sched_getparam(3)

NAME

       sched_getparam - Returns the scheduling parameters of the specified process (P1003.1b)

LIBRARY

       Realtime Library (librt.so, librt.a)

SYNOPSIS

       #include <sched.h>

       int sched_getparam (
       pid_t pid,
       struct sched_param *param);

PARAMETERS

       pid     Specifies  the  ID  of the process for which scheduling parameters are to be returned. If pid is zero, the scheduling parameters of
	       the calling process are returned.

       *param  Specifies a pointer to a sched_param structure to receive the scheduling parameters of the specified process.  The  priority  field
	       receives the current priority of the process specified by the pid. The sched_param structure is defined in <sched.h>.

DESCRIPTION

       The  sched_getparam function returns the scheduling parameters of a process. If the pid is zero, the scheduling parameters are returned for
       the calling process.

       Use the sched_setparam function to change the scheduling parameters.

       Currently, the sched_param structure contains only a priority field.

       The priority of a process is inherited across fork and exec calls.

       No special privileges are needed to use the sched_getparam function.

RETURN VALUES

       On a successful call to the sched_getparam function, a value of 0 (zero) is returned. On an unsuccessful call, a value of  -1  is  returned
       and errno is set to indicate that an error occurred and that no scheduling parameters were returned.

ERRORS

       The sched_getparam function fails under the following conditions:

       [EINVAL]       Invalid  value  specified for the pid argument, the param pointer is NULL, or one or more of the parameters in it is outside
		      the valid range.

       [ESRCH]	      No process can be found corresponding to that specified by pid.

RELATED INFORMATION

       Functions: getpid(2), sched_getscheduler(3), sched_setparam(3), sched_setscheduler(3)

       Guide to Realtime Programming delim off

																 sched_getparam(3)