MPI-/ specifies how the data should be laid out
in a virtual file structure (the view),
not how that file structure is to be stored on one or more disks.
Specification of the physical file structure was
avoided because it is expected that the mapping of files
to disks will be system specific,
and any specific control over file layout would
therefore restrict program portability.
However, there are still cases where some information may be necessary
to optimize file layout.
This information can be provided as hints specified via info
when a file is created (see Section 9.2.8,
page
).
MPI-Standard for MARMOT