SCUSAGE(1)               BSD General Commands Manual              SCUSAGE(1)

NAME
     scusage -- show system call usage statistics

SYNOPSIS
     scusage [-c codefile] [-e] [-l] [-s interval] pid  cmd  -E execute

DESCRIPTION
     scusage displays an ongoing sample of system call and page fault usage
     statistics for a given process in a ``top-like'' fashion.  It requires
     root privileges due to the kernel tracing facility it uses to operate.

     Page faults can be of the following types:
     PAGEIN     page had to read from disk
     ZEROFIL   page was created and zero filled
     COW         page was copied from another page
     CACHEHIT   page was found in the cache

     The arguments are as follows:

     -c      When the -c option is specified, it expects a path to a codefile
             that contains the mappings for the system calls.  This option
             overrides the default location of the system call codefile which
             is found in /usr/share/misc/trace.codes.

     -e      Specifying the -e option generates output that is sorted by call
             count.  This overrides the default sort by time.

     -l      The -l option causes scusage to turn off its continuous window
             updating style of output and instead output as a continuous
             scrolling of data.

     -s      By default, scusage updates its output at one second intervals.
             This sampling interval may be changed by specifying the -s
             option.  Enter the interval in seconds.

     pid  cmd  -E execute
             The last argument must be a process id, a running command name,
             or using the -E option, an execution path followed by optional
             arguments.  The system call usage data for the process or command
             is displayed.  If the -E flag is used, scusage will launch the
             executable, pass along any optional arguments and display system
             call usage date for that executable.

     The data columns displayed are as follows:

     TYPE                      the system call type
     NUMBER                    the system call count
     CPUTIME                  the amount of cpu time consumed
     WAITIME                 the absolute time the process is waiting
     CURENTYPE              the current system call type
     LASTPATHNAMEWAITEDFOR  for each active thread, the last pathname that
                               was referenced by a system call that blocked
     CURWAITIME             the cumulative time that a thread has been
                               blocked
     THRD#                     the thread number
     PRI                       current scheduling priority

     The scusage command also displays some global state in the first few
     lines of output, including the number of preemptions, context switches,
     threads, faults and system calls, found during the sampling period.  The
     current time and the elapsed time that the command has been running is
     also displayed here.  The scusage command is also SIGWINCH savvy, so
     adjusting your window geometry may change the list of system calls being
     displayed.  Typing a `q' will cause scusage to exit immediately.  Typing
     any other character will cause scusage to reset its counters and the
     display.

SAMPLE USAGE
     scusage Finder -e -s2

     scusage will sort the Finder process usage data according to system call
     count and update the output at 2 second intervals.

SEE ALSO
     fsusage(1), latency(1), top(1)

Mac OS X                       October 28, 2002                       Mac OS X