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procsystime(1m)                                 USER COMMANDS                                procsystime(1m)

       procsystime - analyse system call times. Uses DTrace.

       procsystime [-acehoT] [ -p PID | -n name | command ]

       procsystime  prints  details  on  system  call times for processes, both the elapsed times and on-cpu
       times can be printed.

       The elapsed times are interesting, to help identify syscalls that take some time to complete  (during
       which  the process may have slept). CPU time helps us identify syscalls that are consuming CPU cycles
       to run.

       Since this uses DTrace, only users with root privileges can run this command.

       -a     print all data

       -c     print syscall counts

       -e     print elapsed times, ns

       -o     print CPU times, ns

       -T     print totals

       -p PID examine this PID

       -n name
              examine processes which have this name

       Print elapsed times for PID 1871,
              # procsystime -p 1871

       Print elapsed times for processes called "tar",
              # procsystime -n tar

       Print CPU times for "tar" processes,
              # procsystime -on tar

       Print syscall counts for "tar" processes,
              # procsystime -cn tar

       Print elapsed and CPU times for "tar" processes,
              # procsystime -eon tar

       print all details for "bash" processes,
              # procsystime -aTn bash

       run and print details for "df -h",
              # procsystime df -h

              System call name

       TIME (ns)
              Total time, nanoseconds

       COUNT  Number of occurrences

       See the DTraceToolkit for further documentation under the Docs directory. The DTraceToolkit docs  may
       include full worked examples with verbose descriptions explaining the output.

       procsystime will sample until Ctrl-C is hit.

       Brendan Gregg [Sydney, Australia]

       dtruss(1M), dtrace(1M), truss(1)

version 1.00                                    Sep 22, 2005                                 procsystime(1m)

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