Implementing MPI-IO Atomic Mode and Shared File Pointers Using MPI One-Sided Communication

The ROMIO implementation of the MPI-IO standard provides a portable infrastructure for use on top of a variety of underlying storage targets. These targets vary widely in their capabilities, and in some cases additional effort is needed within ROMIO to support all MPI-IO semantics. Two aspects of the interface that can be problematic to implement are MPI-IO atomic mode and the shared file pointer access routines. Atomic mode requires enforcing strict consistency semantics, and shared file pointer routines require communication and coordination in order to atomically update a shared resource. For some file systems, native locks may be used to implement these features, but not all file systems have lock support. In this work, we describe algorithms for implementing efficient mutex locks using MPI-1 and the one-sided capabilities from MPI-2. We then show how these algorithms may be used to implement both MPI-IO atomic mode and shared file pointer methods for ROMIO without requiring...

• Type: Journal
• Year: 2007
• Where: IJHPCA
• Authors: Robert Latham, Robert B. Ross, Rajeev Thakur
• Keywords: Atomic Mode, IJHPCA 2007, MPI-IO Atomic Mode, file Pointer