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bw_mmap_rd - time the reading and summing of a file

BW_MMAP_RD(8) LMBENCH BW_MMAP_RD(8)

NAME

bw_mmap_rd - time the reading and summing of a file

SYNOPSIS

bw_mmap_rd [ -P <parallelism> ] [ -W <warmups> ] [ -N <repetitions> ] size file

DESCRIPTION

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

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.
$Date$ (c)1994 Larry McVoy