NAME

       bw_unix - UNIX pipe bandwidth

SYNOPSIS

       bw_unix [ -P <parallelism> ] [ -W <warmups> ] [ -N <repetitions> ] size

DESCRIPTION

       bw_unix  creates a pipe and forks a child process which keeps writing data to the pipe as fast as it can.
       The benchmark measures how fast the parent process can read the data in size-byte chunks from  the  pipe.
       Nothing is done with the data in either the parent (reader) or child (writer) processes.

       The  size  specification  may  end  with ``k'' or ``m'' to mean kilobytes (* 1024) or megabytes (* 1024 *
       1024).

OUTPUT

       Output format is "%0.2f %.2f\n", megabytes, megabytes_per_second, i.e.,

       8.00 25.33

MEMORY UTILIZATION

       This benchmark should move approximately the reported amount of memory.

ACKNOWLEDGEMENT

       Funding for the development of this tool was provided by Sun Microsystems Computer Corporation.

SEE ALSO

       lmbench(8).

AUTHOR

       Carl Staelin and Larry McVoy

       Comments, suggestions, and bug reports are always welcome.

(c)1994-2000 Larry McVoy and Carl Staelin            $Date$                                           BW_UNIX(8)