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 verbose descriptions explaining the output.

EXIT

procsystime will sample until Ctrl-C is hit.

AUTHOR

Brendan Gregg [Sydney, Australia]