GASNet Core API on Scalable Coherent Interface: Design and Realization

UPC is a promising programming model for shared-memory parallel computing on sharedand distributed-memory system architectures. Berkeley UPC, which utilizes the GASNet communication system, is one promising system aimed to develop a portable, high-performance implementation of UPC for large-scale clusters. Scalable Coherent Interface (SCI) is known for its ability to provide very low latency transfers and direct support of a global shared-memory address space. High-performance parallel clusters built with SCI appear as a promising platform for large-scale UPC applications. This paper introduces the design of the GASNet SCI Conduit Core API. Data structures and algorithms needed to support Active Message (Core API) on top of SCI SISCI API are described and performance results of preliminary tests are included.