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- .\" $Id$
- .TH LAT_MMAP 8 "$Date$" "(c)1994 Larry McVoy" "LMBENCH"
- .SH NAME
- lat_mmap \- costs of mmapping and unmmapping varying file sizes
- .SH SYNOPSIS
- .B lat_mmap
- .I size
- .I file
- .SH DESCRIPTION
- .B lat_mmap
- times how fast a mapping can be made and unmade. This is useful because it
- is a fundemental part of processes that use SunOS style shared libraries
- (the libraries are mapped in at process start up time and unmapped at
- process exit).
- .PP
- The benchmark maps in and unmaps the first \fIsize\fP bytes of the file
- repeatedly and reports the average time for one mapping/unmapping.
- .PP
- The size
- specification may end with ``k'' or ``m'' to mean
- kilobytes (* 1024) or megabytes (* 1024 * 1024).
- .SH OUTPUT
- Output format is \f(CB"%0.2f %d\\n", megabytes, usecs\fP, i.e.,
- .sp
- .ft CB
- 8.00 1200
- .ft
- .SH ACKNOWLEDGEMENT
- Funding for the development of
- this tool was provided by Sun Microsystems Computer Corporation.
- .SH "SEE ALSO"
- lmbench(8), open(2), mmap(2), munmap(2).
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