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1994
IEEE

Software-Extended Coherent Shared Memory: Performance and Cost

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Software-Extended Coherent Shared Memory: Performance and Cost
This paper evaluates the tradeoffs involved in the design of the software-extended memory system of Alewife, a multiprocessor architecturethat implements coherentsharedmemorythrough a combination of hardware and software mechanisms. For each block of memory, Alewife implements between zero and five coherence directory pointers in hardwareand allows software to handle requests when the pointers are exhausted. The software includes a flexible coherence interface that facilitates protocol software implementation. This interface is indispensable for conducting experiments and has proven important for implementing enhancements to the basic system. Simulations of a number of applications running on a complete system (with up to 256 processors) demonstrate that the hybrid architecture with five pointers achieves between 71% and 100% of full-map directory performance at a constant cost per processing element. Our experience in designing the software protocol interfaces and experiments with a ...
David Chaiken, Anant Agarwal
Added 09 Aug 2010
Updated 09 Aug 2010
Type Conference
Year 1994
Where ISCA
Authors David Chaiken, Anant Agarwal
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