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



NAME
       procsystime - analyse system call times. Uses DTrace.

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

DESCRIPTION
       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 the root user or users with the dtrace_kernel  privilege  can  run  this
       command.

OPTIONS
       -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

EXAMPLES
       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


FIELDS
       SYSCALL
              System call name

       TIME (ns)
              Total time, nanoseconds

       COUNT  Number of occurrences

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

EXIT
       procsystime will sample until Ctrl-C is hit.

AUTHOR
       Brendan Gregg [Sydney, Australia]

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




version 1.00                                    Sep 22, 2005                                 procsystime(1m)