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procsystime(1m) [osx man page]

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)

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dtruss(1m)							   USER COMMANDS							dtruss(1m)

NAME
dtruss - process syscall details. Uses DTrace. SYNOPSIS
dtruss [-acdeflhoLs] [-t syscall] { -p PID | -n name | command } DESCRIPTION
dtruss prints details on process system calls. It is like a DTrace version of truss, and has been designed to be less intrusive than truss. Of particular interest is the elapsed times and on cpu times, which can identify both system 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 system call counts -d print relative timestamps, us -e print elapsed times, us -f follow children as they are forked -l force printing of pid/lwpid per line -L don't print pid/lwpid per line -n name examine processes with this name -o print on-cpu times, us -s print stack backtraces -p PID examine this PID -t syscall examine this syscall only EXAMPLES
run and examine the "df -h" command # dtruss df -h examine PID 1871 # dtruss -p 1871 examine all processes called "tar" # dtruss -n tar run test.sh and follow children # dtruss -f test.sh run the "date" command and print elapsed and on cpu times, # dtruss -eo date 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 SYSCALL(args) system call name, with arguments (some may be evaluated) 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
dtruss will run forever until Ctrl-C is hit, or if a command was executed dtruss will finish when the command ends. AUTHOR
Brendan Gregg [Sydney, Australia] SEE ALSO
procsystime(1M), dtrace(1M), truss(1) version 0.80 Jun 17, 2005 dtruss(1m)
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