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bw_mmap_rd - time the reading and summing of a file
bw_mmap_rd
[ -P <parallelism> ] [ -W <warmups> ] [ -N <repetitions> ] size file
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 with lmdd(8)
.
The size specification
may end with ‘‘k’’ or ‘‘m’’ to mean kilobytes (* 1024) or megabytes (* 1024 * 1024).
Output format is CB"%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.
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