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This tool will try to simultaneously open the specified number of files
in the specified directory.  It is useful to check if hard limits are
high enough, and also check if a filesystem performs well when many files
are open at the same time.  The sdcard daemon has some issues in this
area, both in max files that can be open at once, and performance
issues when too many are open.

Change-Id: I05a1ca49208f54a27d5405e4850752f49cdca443