Persistent Memory Development Kit
This is src/test/tools/cmpmap/README.
This directory contains a tool for comparing files byte by byte using mmap.
It lets you compare regular files as well as DAX devices.
Currently only checking if part of a file is zeroed is implemented.
It's used as a helper program by some unit tests.
Usage:
$ cmpmap [options] file1 [file2]
Available options:
-l, --length=N - compare up to N bytes,
-o, --offset=N - skip N bytes at start of the files,
-z, --zero - compare bytes to NUL,
-h, --help - print help message.