9.6.4. Collective File Operations
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Collective file operations are subject to the same restrictions as collective communication operations. For a complete discussion, please refer to the semantics set forth in MPI-1 [6], Section 4.12.
Collective file operations are collective over a dup of the communicator used to open the file---this duplicate communicator is implicitly specified via the file handle argument. Different processes can pass different values for other arguments of a collective routine unless specified otherwise.
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MPI-2.0 of July 18, 1997
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