FSUSAGE(1) BSD General Commands Manual FSUSAGE(1)

NAME
     ffssuussaaggee - report system calls and page faults related to filesystem
     activity in real-time

SYNOPSIS
     ffssuussaaggee [[-ee]] [[-ww]] [[-ff mmooddee [[-ff mmooddee]] ......]] [ppiidd||ccmmdd [[ppiidd||ccmmdd]] ......]]

DESCRIPTION
     The ffssuussaaggee utility presents an ongoing display of system call usage
     information pertaining to filesystem activity.  It requires root privi-
     leges due to the kernel tracing facility it uses to operate.  By default
     the activity monitored includes all system processes except the running
     ffssuussaaggee process, Terminal, telnetd, sshd, rlogind, tcsh, csh and sh.
     These defaults can be overridden such that output is limited to include
     or exclude a list of processes specified by the user.

     The output presented by ffssuussaaggee is formatted according to the size of
     your window.  A narrow window will display fewer columns of data.  Use a
     wide window for maximum data display.  You may override the window for-
     matting restrictions by forcing a wide display with the -ww option.  In
     this case, the data displayed will wrap when the window is not wide
     enough.

     The options are as follows:

     -ee      Specifying the -ee option generates output that excludes sampling
             of the running fsusage tool.  If a list of process ids or com-
             mands is also given, then those processes are also excluded from
             the sampled output.

     -ww      Specifying the -ww option forces a wider, more detailed output,
             regardless of the window size.

     -ff      Specifying the -ff option turns on output filtering based on the
             mode provided.  Multiple filtering options can be specified.  By
             default no output filtering occurs.  The supported modes are:

             network    Only network related output is displayed.

             filesys    Only file system related output is displayed.

             cachehit   In addition, display CACHEHIT output.

     pid | cmd
             The sampled data can be limited to a list of process ids or com-
             mands.  When a command name is given, all processes with that
             name will be sampled.  Using the -ee option has the opposite
             effect, excluding sampled data relating to the given list of
             process ids or commands.

     If you set the DYLDIMAGESUFFIX environment variable to ``debug'', then
     an application will use the debug version of all libraries including the
     Carbon FileManager.  See dyld(1).  When ffssuussaaggee is run against a Carbon
     Application launched in this environment, then the high level Carbon
     FileManager calls will be displayed bracketing the system calls that they
     are built on.

     The data columns displayed are as follows:

     TIMESTAMP
             TOD when call occurred.  Wide mode will have millisecond granu-
             larity.

     CALL    The name of the network or filesystem related call, page-in,
             page-out or physical disk access.

     FILE DESCRIPTOR
             Of the form F=x, x is a file descriptor.  Depending on the type
             of system call, this will be either an input value or a return
             value.

     BYTE COUNT
             Of the form B=x, x is the number of bytes requested by the call.

     [ERRNO]
             On error, the errno is displayed in brackets.

     PATHNAME
             Pathname of the file accessed (up to the last 28 bytes).

     FAULT ADDRESS
             Of the form A=0xnnnnnnnn, where 0xnnnnnnnn is the address being
             faulted.

     DISK BLOCK NUMBER
             Of the form D=0xnnnnnnnn, where 0xnnnnnnnn is the block number of
             the physical disk block being read or written.

     OFFSET  Of the form O=0xnnnnnnnn, where 0xnnnnnnnn is a file offset.

     SELECT RETURN
             Of the form S=x, x is the number of ready descriptors returned by
             the select() system call.  If S=0, the time limit expired.

     TIME INTERVAL(W)
             The elapsed time spent in the system call.  A `W' after the
             elapsed time indicates the process was scheduled out during this
             file activity.  In this case, the elapsed time includes the wait
             time.

     PROCESS NAME
             The process that made the system call.

SSAAMMPPLLEE UUSSAAGGEE
     fsusage -w -f filesys Mail

     ffssuussaaggee will display file system related data for all instances of pro-
     cesses named Mail.  Maximum data output will be displayed in the window.

SEE ALSO
     top(1), scusage(1), latency(1), dyld(1)

Mac OS X                       November 7, 2002                       Mac OS X