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Created page with "=== Opérations par déplacements ==="
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== Utilisation== | == Utilisation== | ||
=== | === Opérations par déplacements === | ||
The simplest way to perform parallel read and write operations is to use offsets. Each process can read from or write to the file with a defined offset. This can be done in two operations ([http://www.open-mpi.org/doc/current/man3/MPI_File_seek.3.php MPI_File_seek] followed by [http://www.open-mpi.org/doc/current/man3/MPI_File_read.3.php MPI_File_read] or by [http://www.open-mpi.org/doc/current/man3/MPI_File_write.3.php MPI_File_write]), or even in a single operation ([http://www.open-mpi.org/doc/current/man3/MPI_File_read_at.3.php MPI_File_read_at] or [http://www.open-mpi.org/doc/current/man3/MPI_File_write_at.3.php MPI_File_write_at]). Usually the offset is computed as a function of the process rank. | The simplest way to perform parallel read and write operations is to use offsets. Each process can read from or write to the file with a defined offset. This can be done in two operations ([http://www.open-mpi.org/doc/current/man3/MPI_File_seek.3.php MPI_File_seek] followed by [http://www.open-mpi.org/doc/current/man3/MPI_File_read.3.php MPI_File_read] or by [http://www.open-mpi.org/doc/current/man3/MPI_File_write.3.php MPI_File_write]), or even in a single operation ([http://www.open-mpi.org/doc/current/man3/MPI_File_read_at.3.php MPI_File_read_at] or [http://www.open-mpi.org/doc/current/man3/MPI_File_write_at.3.php MPI_File_write_at]). Usually the offset is computed as a function of the process rank. | ||