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dtruss(1m) 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 ver- sion 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 the root user or users with the dtrace_kernel privilege can run this command. OS Solaris STABILITY stable - needs the syscall provider. OPTIONS -a print all details -b bufsize dynamic variable buffer size. Increase this if you notice dy- namic 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 (microsec- onds) 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 direc- tory. 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 exe- cuted dtruss will finish when the command ends. AUTHOR Brendan Gregg [Sydney, Australia] SEE ALSO procsystime(1M), dtrace(1M), truss(1) USER COMMANDS $Date:: 2007-08-05 #$ dtruss(1m)
NAME | SYNOPSIS | DESCRIPTION | OS | STABILITY | OPTIONS | EXAMPLES | FIELDS | DOCUMENTATION | EXIT | AUTHOR | SEE ALSO
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