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The S3.mp prototype system is being irnplentented by SMCC’S Technology Development group to demonstrate a low overhead. high throughput communication systan tltat is based on distributed shared memory (DSM). Conceptually, S3.mp is a virtual busextertder that preserves the semantics of accesing memory across alt nodes. Unlike multiprocessor busses that use broadcast$tg to preserve memory coherency, S3.mp uses directories and #xrqt-topoint messages over a packet switched interconnect abrlc to achieve scalabfity over a tie range of system cordigurations. communication technology advances, such as high speed fiber optics, are the driving force behind the S3.mp develcpmen~ While it is technically easier to utilize the increasa.d bandwidth with conventional DMA devi=, the resulting message passing hardware re@res substantial software overhead to process protocol stacks, manage bufkxs, encode apd decode messag=y etc. In S3.mp, communication happens as a st&-effect of accemng memory a single store or load instruction is sufficient to send or receive data. The set of transactions that are required to support the DSM paradigm is small and well delined w that the S3.mp protocols were amenable to formal verification methods and are implemented directly in hardware. S3.mp systems are similar to ALEWILE, DASH, PLUS and other nonuniform memory access multiprocessors. However untike th= conventional NUMA MPs, wtuch strive to det.iwx the most IvfFtops to one.scientdic application, S3.mp is optimized for a large collection of independent applications that share common comptttin resources which maybe spatially distributed. Conse$ qtrently, 3.mp nodes maybe separated by up to 200m, which mean that a S3 .m s stem could be distributed over an entire tial{ building. Essen y, 3.mp systemsare build by adding a specialLzJirti:hcoutect controller to the memory subsystem of a norrnat

The S3.mp architecture