BW_MMAP_RD(8) - LMBENCH man page


NAME

bw_mmap_rd - time the reading and summing of a file

SYNOPSIS

bw_mmap_rd 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).