Achieving Quality of Service Communication on Distributed Shared Memory System by Better API Design and Implementation

Parallel applications, emerging in the last several years, require high-performance communication and computation systems, and have additionally placed stringent quality of service (QoS) requirements on programming environments. Especially with the introduction of new communication protocols for cluster computing such as Virtual Interface (VI) architecture, the design and implementation of an efficient userlevel messaging layer for parallel applications presents itself as a vital factor for effectively utilizing the underlying system architecture and reducing overhead to achieve QoS. Real-time message passing interface (MPI/RT) is an ongoing standard and is targeted at embedded real-time distributed systems. This paper describes the impact of the design of messaging layer API in achieving better QoS, effective implementation, and utilization of resources. API design, implementation, and performance between two messaging layer standards, MPI/RT and MPI are compared. Some aspects of design and implementation of MPI/RT on VI architecture are discussed.