dappprof - profile user and lib function usage. Uses DTrace. dappprof [-acehoTU] [-u lib] { -p PID | command } dappprof prints details on user and library call times for processes as a summary style aggragation. By default the user fuctions are traced, options can be used to trace library activity. Output can include function counts, elapsed times and on cpu times. The elapsed times are interesting, to help identify functions 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. Solaris stable - needs the pid provider.

-a print all data

-c print function counts

-e print elapsed times, ns

-o print CPU times, ns

-T print totals

-p PID examine this PID

-u lib trace this library instead

-U trace all library and user functions

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

print elapsed times, on-cpu times and counts for "df -h", # dappprof -ceo df -h

print elapsed times for PID 1871, # dappprof -p 1871

print all data for PID 1871, # dappprof -ap 1871

CALL Function call name

ELAPSED Total elapsed time, nanoseconds

CPU Total on-cpu 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. dappprof will sample until Ctrl-C is hit. Brendan Gregg [Sydney, Australia] dapptrace(1M), dtrace(1M), apptrace(1)