A Multithreaded Communication Substrate for OpenSHMEM

Abstract

OpenSHMEM scalability is strongly dependent on the capability of its communication layer to efficiently handle multiple threads. In this paper, we present an early evaluation of the thread safety specification in the Unified Common Communication Substrate (UCCS) employed in OpenSHMEM. Results demonstrate that thread safety can be provided at an acceptable cost and can improve efficiency for some operations, compared to serializing communication.