Query: dtruss
OS: mojave
Section: 1m
Format: Original Unix Latex Style Formatted with HTML and a Horizontal Scroll Bar
dtruss(1m) USER COMMANDS dtruss(1m)NAMEdtruss - process syscall details. Uses DTrace.SYNOPSISdtruss [-acdeflhoLs] [-t syscall] { -p PID | -n name | command }DESCRIPTIONdtruss 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 -W name wait for a process matching this name -o print on-cpu times, us -s print stack backtraces -p PID examine this PID -t syscall examine this syscall onlyEXAMPLESrun 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 dateFIELDSPID/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)DOCUMENTATIONSee the DTraceToolkit for further documentation under the Docs directory. The DTraceToolkit docs may include full worked examples with ver- bose descriptions explaining the output.EXITdtruss will run forever until Ctrl-C is hit, or if a command was executed dtruss will finish when the command ends.AUTHORBrendan Gregg [Sydney, Australia]SEE ALSOprocsystime(1M), dtrace(1M), truss(1) version 0.80 Jun 17, 2005 dtruss(1m)