PROCESS-MANAGEMENT MONITOR in Font

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CHAPTER 31 PROCESS-MANAGEMENT MONITOR
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if [ "$killoption" = "" ] then killoption=0 fi test $debug -gt 0 && echo "Kill $process processes if $type is greater than $errval"
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Next we pare down the full list of processes running on the system to the ones running the command being monitored. Then we start a loop that iterates through the remaining processes.
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for pid in `ps -eo pid,comm | egrep "${process}$|${process}:$" | grep -v grep | awk '{print $1}'` do
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For each process ID, the script has to gather the pertinent information. The embedded ps command gathers only the specific information we want.
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test $debug -gt 0 && echo "$process pid $pid" pid_string=`ps -eo pid,cputime,etime,pcpu,vsize,comm | \ grep $pid | egrep "${process}$|${process}:$" | grep -v grep`
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The following case statement is the heart of the monitor. The script tests for the monitor type (cputime, etime, pcpu, or vsize); the cputime is the first monitor type listed. The code for each type is slightly different, but all are very similar. Here we obtain the process time from the ps output, as well as the number of fields that the proc_time variable contains.
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case $type in "cputime") proc_time=`echo $pid_string | awk '{print $2}'` fields=`echo $proc_time | awk -F: '{print NF}'` proc_time_min=`echo $proc_time | awk -F: '{print $(NF-1)}'`
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Both of these are needed because the format of the time value varies depending on the amount of time it represents. The cputime and etime variables have values of the form days-hours:minutes:seconds or hours:minute:seconds. A low value might look something like 00:28 for 28 seconds. A high value could be 1-18:32:29 for 1 day, 18 hours, 32 minutes, and 29 seconds. Both of these types have to be processed and converted to minutes. (Seconds are dropped for simplicity.) Of the four performance indicators, the logic for handling the cputime and etime values is the most complex because the format used to report them changes depending on the amount of time these values represent.
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if [ $fields -lt 3 ] then proc_time_hr=0 proc_time_day=0
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CHAPTER 31 PROCESS-MANAGEMENT MONITOR
else proc_time_hr=`echo $proc_time | awk -F: '{print $(NF-2)}'` fields=`echo $proc_time_hr | awk -F- '{print NF}'` if [ $fields -ne 1 ] then proc_time_day=`echo $proc_time_hr | awk -F- '{print $1}'` proc_time_hr=`echo $proc_time_hr | awk -F- '{print $2}'` else proc_time_day=0 fi fi
Once all time values have been determined, we convert them to minutes for comparison with the monitor thresholds.
curr_cpu_time=\ `echo "$proc_time_day*1440+$proc_time_hr*60+$proc_time_min"\ | bc` test $debug -gt 0 && echo "Current cpu time for \ $process pid $pid is $curr_cpu_time minutes"
If the current cputime value is between the warning and error thresholds, we call the notify() function with the appropriate switches. It will handle output and process termination, as described earlier.
if test $curr_cpu_time -gt $value -a \ $curr_cpu_time -lt $errval then notify "Warning" $killoption $process $pid \ $curr_cpu_time $value "minutes of CPU time"
If the current cputime is greater than the error threshold, we call the notify() function with a different set of options.
elif test $curr_cpu_time -ge $errval then notify "Error" $killoption $process $pid \ $curr_cpu_time $value "minutes of CPU time"
The final condition handles the case where there is no issue with the running process: the script just issues a message saying so.
else test $debug -gt 0 && echo "process cpu time ok" fi ;;
CHAPTER 31 PROCESS-MANAGEMENT MONITOR
The etime monitor is nearly the same as the cputime monitor. The primary difference is the field that is extracted from the ps output to get the current process age.
"etime") proc_age=`echo $pid_string | awk '{print $3}'` fields=`echo $proc_age | awk -F: '{print NF}'` proc_age_min=`echo $proc_age | awk -F: '{print $(NF-1)}'`
Once again, you convert the age of the process to values that will then be used to calculate the age in minutes.
if [ $fields -lt 3 ] then proc_age_hr=0 proc_age_day=0 else proc_age_hr=`echo $proc_age | awk -F: '{print $(NF-2)}'` fields=`echo $proc_age_hr | awk -F- '{print NF}'` if [ $fields -ne 1 ] then proc_age_day=`echo $proc_age_hr | awk -F- '{print $1}'` proc_age_hr=`echo $proc_age_hr | awk -F- '{print $2}'` else proc_age_day=0 fi fi
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