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	SCHEDULE: NOV 11-17, 2006 Optimized Collectives for PGAS Languages with One-Sided Communication Session: Poster Reception Event Type: Poster Time: 5:15pm - 7:15pm Author(s): Dan Bonachea, Paul Hargrove, Rajesh Nishtala, Michael Welcome, Katherine Yelick Location: Ballroom Corridor Abstract: Optimized collective operations are a crucial performance factor for many scientific applications. This work investigates the design and optimization of collectives in the context of Partitioned Global Address Space (PGAS) languages such as Unified Parallel C (UPC). Languages with one-sided communication permit a more flexible and expressive collective interface with application code, in turn enabling more aggressive optimization and more effective utilization of system resources. We investigate the design tradeoffs in a collectives implementation for UPC, ranging from resource management to synchronization mechanisms and target-dependent selection of optimal communication patterns. Our collectives are implemented in the Berkeley UPC compiler using the GASNet communication system, tuned across a wide variety of supercomputing platforms, and benchmarked against MPI collectives. Special emphasis is placed on the newly added Cray XT3 backend for UPC, whose characteristics are benchmarked in detail. Chair/Author Details: Dan Bonachea University of California, Berkeley Paul Hargrove Lawrence Berkeley National Laboratory Rajesh Nishtala University of California, Berkeley Michael Welcome Lawrence Berkeley National Laboratory Katherine Yelick University of California, Berkeley
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