94. Three Dimensional SPMD Matrix–Matrix Multiplication Algorithm and a Stacked Many-Core Processor Architecture

Current applications in image and media processing, scientific and engineering computing require a tremendous processing and higher memory bandwidth to gain high performance. Three dimensional multi/manycore processors stacked with memory layer(s) may provide good processing facilities to enhance the performance of these applications. In this paper, we introduce a proposal of a 3-D stacked many-core processor architecture composing of a number of processing elements (PEs) layers stacked with one or more memory layer shared among all PEs. Unlike many 3-D machine architectures, the proposed model uses local communications between PEs in both horizontal and vertical links avoiding the cost of building specialized interconnection networks. We present a novel memory efficient SPMD blocked algorithm for performing the kernel matrix–matrix multiply operation (MMM), on the 3D processor architecture. Our analytical evaluation of the 3-D stacked architecture showed a near linear speedup as the number of PE layers increases while data communication and redistribution is overlapped with computing.