%0 Conference Paper %B 8th International Conference on Partitioned Global Address Space Programming Models (PGAS) %D 2014 %T A Multithreaded Communication Substrate for OpenSHMEM %A Aurelien Bouteiller %A Thomas Herault %A George Bosilca %X OpenSHMEM scalability is strongly dependent on the capa- bility of its communication layer to efficiently handle multi- ple threads. In this paper, we present an early evaluation of the thread safety specification in the Unified Common Com- munication Substrate (UCCS) employed in OpenSHMEM. Results demonstrate that thread safety can be provided at an acceptable cost and can improve efficiency for some op- erations, compared to serializing communication. %B 8th International Conference on Partitioned Global Address Space Programming Models (PGAS) %C Eugene, OR %8 2014-10 %G eng