bw_mmap_rd - time the reading and summing of a file
bw_mmap_rd [ -P <parallelism> ] [ -W <warmups> ] [ -N <repetitions> ]
bw_mmap_rd creates a memory mapping to the file and then reads the
mapping in an unrolled loop similar to that used in bw_mem_rd(8). The
benchmark is intended to be used on a file that is in memory, i.e., the
benchmark is a reread benchmark. Other file benchmarking can be done
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.,
This benchmark should move approximately the reported amount of memory.
Funding for the development of this tool was provided by Sun
Microsystems Computer Corporation.
Carl Staelin and Larry McVoy
Comments, suggestions, and bug reports are always welcome.
(c)1994 Larry McVoy $Date$