BW_MMAP_RD(8) - Linux man page online | Administration and privileged commands
Time the reading and summing of a file.
BW_MMAP_RD(8) LMBENCH BW_MMAP_RD(8)
(c)1994 Larry McVoy $Date$ BW_MMAP_RD(8)
NAMEbw_mmap_rd - time the reading and summing of a file
SYNOPSISbw_mmap_rd [ -P <parallelism> ] [ -W <warmups> ] [ -N <repetitions> ] size file
DESCRIPTIONbw_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).
OUTPUTOutput format is "%0.2f %.2f\n", megabytes, megabytes_per_second, i.e., 8.00 25.33
MEMORY UTILIZATIONThis benchmark should move approximately the reported amount of memory.
ACKNOWLEDGEMENTFunding for the development of this tool was provided by Sun Microsystems Computer Corpo‐ ration.
AUTHORCarl Staelin and Larry McVoy Comments, suggestions, and bug reports are always welcome.
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|refer to||bw_mem_rd(8) | lmbench(8) | lmdd(8)|