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