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BW_UNIX(8)                          LMBENCH                         BW_UNIX(8)

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)