Passing variable as input & storing output in other variable Post: 302954266

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LEARN ABOUT OSX

dapptrace

dapptrace(1m)							   USER COMMANDS						     dapptrace(1m)

NAME

       dapptrace - trace user and library function usage. Uses DTrace.

SYNOPSIS

       dapptrace [-acdeFlhoU] [-u lib] { -p PID | command }

DESCRIPTION

       dapptrace prints details on user and library function calls. By default it traces user functions only, options can be used to trace library
       activity.

       Of particular interest is the elapsed times and on cpu times, which can identify both function calls that are slow to complete,	and  those
       which are consuming CPU cycles.

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

OPTIONS

       -a     print all details

       -b bufsize
	      dynamic variable buffer size. Increase this if you notice dynamic variable drop errors. The default is "4m" for 4 megabytes per CPU.

       -c     print function call counts

       -d     print relative timestamps, us

       -e     print elapsed times, us

       -F     print flow indentation

       -l     force printing of pid/lwpid per line

       -o     print on-cpu times, us

       -p PID examine this PID

       -u lib trace this library instead

       -U     trace all library and user functions

EXAMPLES

       run and examine the "df -h" command,
	      # dapptrace df -h

       examine PID 1871,
	      # dapptrace -p 1871

       print using flow indents,
	      # dapptrace -Fp 1871

       print elapsed and CPU times,
	      # dapptrace -eop 1871

FIELDS

       PID/LWPID
	      Process ID / Lightweight Process ID

       RELATIVE
	      relative timestamps to the start of the thread, us (microseconds)

       ELAPSD elapsed time for this system call, us

       CPU    on-cpu time for this system call, us

       CALL(args)
	      function call name, with some arguments in hexadecimal

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

       dapptrace will run forever until Ctrl-C is hit, or if a command was executed dapptrace will finish when the command ends.

AUTHOR

       Brendan Gregg [Sydney, Australia]

SEE ALSO

       dappprof(1M), dtrace(1M), apptrace(1)

version 1.10							   May 14, 2005 						     dapptrace(1m)

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