NAMEbw_unix - UNIX pipe bandwidth
SYNOPSISbw_unix [ -P <parallelism> ] [ -W <warmups> ] [ -N <repetitions> ] size
DESCRIPTIONbw_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).
OUTPUTOutput format is "%0.2f %.2f\n", megabytes, megabytes_per_second, i.e., 8.00 25.33
MEMORY UTILIZATIONThis benchmark should move approximately the reported amount of memory.
ACKNOWLEDGEMENTFunding for the development of this tool was provided by Sun Microsystems Computer Corporation.
AUTHORCarl Staelin and Larry McVoy Comments, suggestions, and bug reports are always welcome. (c)1994-2000 Larry McVoy and Carl St$Date$ BW_UNIX(8)