MPIFile
MPIFile refers to the file handle used in the MPI-IO facilities of the Message Passing Interface (MPI). An MPI_File represents an opened file that can be accessed by multiple processes in a parallel program. Files are opened with MPI_File_open and closed with MPI_File_close. I/O can be performed collectively or independently, using routines such as MPI_File_read, MPI_File_write, and their position-based variants like MPI_File_read_at and MPI_File_write_at, as well as their collective forms (e.g., MPI_File_read_all, MPI_File_write_at_all). These routines operate on an MPI_File handle, a memory buffer, a count, an MPI_Datatype, and an optional status.
Access layout is described by a file view, set with MPI_File_set_view. The view defines how elements in
File pointers can be managed in two ways. Each process maintains an individual file pointer for non-at
Performance in MPI-IO depends on the MPI implementation and the underlying file system. MPI_Info can be used