Open MPI: a High Performance, Flexible Implementation of MPI Point-to-Point Communications

’s point-to-point communications abstractions, described in this paper, handle several different communications scenarios, with a portable, high-performance design and tation. These abstractions support two types of low-level communication protocols – general purpose point-to-point communications, like the OpenIB interface, and MPI-like interfaces, such as Myricom’s MX library. Support for the first type of protocols makes use of all communications resources available to a given application run, with optional support for communications error recovery. The latter provides a interface layer, relying on the communications library to guarantee correct MPI message ordering and matching. This paper describes the three point-to-point communications protocols currently supported in the Open MPI implementation, supported with performance data. This includes comparisons with other MPI implementations using the OpenIB, MX, and GM communications libraries.

• Type: Journal
• Year: 2007
• Where: PPL
• Authors: Richard L. Graham, Brian Barrett, Galen M. Shipman, Timothy S. Woodall, George Bosilca
• Keywords: Communications, Point-to-point Communications, Point-to-point Communications Abstractions, PPL 2007