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A comment on Mkfile(8) is severely syscall limited on OS X. Parent comment

Re:Mkfile(8) is severely syscall limited on OS X by mpweiher on Sunday February 19, 2017 @11:50AM (#13680540)
OS X does write-coalescing.
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Re:Mkfile(8) is severely syscall limited on OS X by cbsmith on Sunday February 19, 2017 @03:28PM (#13681800)
You can't write coalesce IO operations that haven't been called yet.
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