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Full Discussion: Restart a Service!!
Top Forums Shell Programming and Scripting Restart a Service!! Post 302351459 by peterro on Tuesday 8th of September 2009 03:13:41 PM
Old 09-08-2009
Depending on what version of sar you have, the -x|X switches are pid specific.

For a process monitor, I'd probably want it to run all the time and then periodically grab the ps output to determine if the process is under|over your thresholds. One large loop with a sleep at the end. Every iteration through the loop would take another snapshot of the state of your processes and make comparisons. You could also store the results of the previous few snapshots calculating averages.

Since you're going through all the work, you could make it more generic than just your specific process (winbind) and pass variables or have a configuration file to monitor any process you like for whatever attribute you like. Have a look at chapter 31 in Expert Shell Scripting for more.
 

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serialize(2)							System Calls Manual						      serialize(2)

NAME
serialize() - force target process to run serially with other processes SYNOPSIS
DESCRIPTION
The system call is used to force the target process referenced by the pid value passed in to run serially with other processes also marked for serialization. If the value of pid is zero, then the currently running process is marked for serialization. Once a process has been marked by the process stays marked until process completion, unless is reissued on the serialized process with timeshare set to 1. If timeshare is set to 1, the process specified in pid will be returned to normal timeshare scheduling algorithms. This call is used to improve process throughput since process throughput usually increases for large processes when they are executed seri- ally instead of allowing each program to run for only a short period of time. By running large processes one at a time, the system makes more efficient use of the CPU as well as system memory, since each process does not end up constantly faulting in its working set, to only have the pages stolen when another process starts running. As long as there is enough memory in the system, processes marked by behave no differently from other processes in the system. However, once memory becomes tight, processes marked by are run one at a time with the highest priority processes being run first. Each process runs for a finite interval of time before another serialized process is allowed to run. RETURN VALUE
returns zero upon successful completion, or nonzero if the system call failed. ERRORS
If fails, it sets (see errno(2)) to the following value: The pid passed in does not exist. WARNINGS
The user has no way of forcing an execution order on serialized processes. AUTHOR
was developed by HP. SEE ALSO
serialize(1), privileges(5). serialize(2)
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