Why CPU time is longer than Elasped time?

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LEARN ABOUT MOJAVE

procsystime

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 users with root privileges 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 ver-
       bose 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)

Shell Programming and Scripting