[Bug 13609] rsync can be crazy slow on os x 10.13.6 when copying via usb drives

[samba-bugs at samba.org]

https://bugzilla.samba.org/show_bug.cgi?id=13609

--- Comment #4 from Dave Gordon <dg32768 at zoho.eu> ---
How about using truss/strace/whatever the OSX equivalent is to get a count of
all system calls made, when run with and without the --sparse option. Total
time on each type of call would be useful too.

If you find that --sparse results in ten times as many write(2)s, that might be
a useful clue!

BTW remember there is a bug that is triggered by using --sparse and
--preallocate (and possibly --inplace) together. See
https://bugzilla.samba.org/show_bug.cgi?id=13320#c1 for details.

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