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)