SLICC: a low latency interface for collective communications

Authors:
Allan D. Knies;William J. Harrod;F. Ray Barriuso;George B. Adams, III
Affiliations:
Purdue University, West Lafayette, IN;Cray Research Incorporated, Eagan, MN;Cray Research Incorporated, Eagan, MN;Purdue University, West Lafayette, IN
Venue:
Proceedings of the 1994 ACM/IEEE conference on Supercomputing
Year:
1994

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Implications of application usage characteristics for collective communication offload

International Journal of High Performance Computing and Networking

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Abstract

Several recent parallel computers have implemented logically shared, physically distributed memory systems which allow processors to directly access memory in other processors without interrupting the referenced PE. Because this kind of architecture provides greater flexibility for interprocessor communications than private address space computers, different software models can be developed to take advantage of these machines. In this paper, we describe a low-level collective communications interface specifically tailored for shared address space parallel computers. We also provide performance results for an implementation on the Cray T3D and compare its performance to Cray's PVM implementation. These results show that SLICC can be more than 10 times faster than PVM on the T3D.