Friday, 19 July 2013

Top 12 'PS' Performance Commands

I use following ps commands in order to check for performance probelms:
1) Displaying top CPU_consuming processes:
 # ps aux|head -1; ps aux|sort -rn +2|head -10
2) Displaying top 10 memory-consuming processes:
# ps aux|head -1; ps aux|sort -rn +3|head
3) Displaying process in order of being penalized:
# ps -eakl|head -1; ps -eakl|sort -rn +5
4) Displaying process in order of priority:
# ps -eakl|sort -n +6|head
5) Displaying process in order of nice value
# ps -eakl|sort -n +7
6) Displaying the process in order of time
# ps vx|head -1;ps vx|grep -v PID|sort -rn +3|head -10
7) Displaying the process in order of real memory use
# ps vx|head -1; ps vx|grep -v PID|sort -rn +6|head -10
8) Displaying the process in order of I/O
# ps vx|head -1; ps vx|grep -v PID|sort -rn +4|head -10
9) Displaying WLM classes
# ps -a -o pid, user, class, pcpu, pmem, args
10) Determining process ID of wait processes:
# ps vg|head -1; ps vg|grep -w wait
11) Wait process bound to CPU
 # ps -mo THREAD -p
12) CPU usage with priority levels
 # topas -P

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