Role of WDM optical interconnections in a distributed shared-memory multiprocessor

Kanad Ghose; Nitin K. Singhvi; R. Kym Horsell

doi:10.1117/12.147093

1 July 1993 Role of WDM optical interconnections in a distributed shared-memory multiprocessor

Kanad Ghose, Nitin K. Singhvi, R. Kym Horsell

Proceedings Volume 1849, Optoelectronic Interconnects; (1993) https://doi.org/10.1117/12.147093
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States

Abstract

This paper explores the use of optical spanning bus interconnections using optical fiber links and wavelength division multiplexing (WDM) with statically assigned channels for implementing distributed shared memory multiprocessors (DSMM). The WDM optical links allow processor synchronization and coherent caches -- two very important requirements for a DSMM -- to be implemented efficiently. Simultaneous broadcasts possible on several channels along a WDM photonic link allow barrier synchronizations to be fast and scalable. The large bandwidth capability of WDM optical links and their ability for accommodating simultaneously -- active channels permits a write-update based cache coherence protocol to be implemented. Our proposed cache coherence protocol is sensitive to the relatively longer propagation delays along optic fiber links and possible mismatch in speeds between the electronic and photonic components. The protocol is hierarchical, reflecting the hierarchy in the interconnection, making it easily scalable with system size. In addition, the proposed protocol performs opportunistic request combining, a pleasant side-effect of using optical links.

Citation Download Citation

Kanad Ghose, Nitin K. Singhvi, and R. Kym Horsell "Role of WDM optical interconnections in a distributed shared-memory multiprocessor", Proc. SPIE 1849, Optoelectronic Interconnects, (1 July 1993); https://doi.org/10.1117/12.147093

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