Notified Access: Extending Remote Memory Access Programming Models for Producer-Consumer Synchronization

Roberto Belli, Torsten Hoefler

Research output: Chapter in Book/Report/Conference proceedingConference contribution

27 Scopus citations

Abstract

Remote Memory Access (RMA) programming enables direct access to low-level hardware features to achieve high performance for distributed-memory programs. However, the design of RMA programming schemes focuses on the memory access and less on the synchronization. For example, in contemporary RMA programming systems, the widely used producer-consumer pattern can only be implemented inefficiently, incurring in an overhead of an additional round-trip message. We propose Notified Access, a scheme where the target process of an access can receive a completion notification. This scheme enables direct and efficient synchronization with a minimum number of messages. We implement our scheme in an open source MPI-3 RMA library and demonstrate lower overheads (two cache misses) than other point-to-point synchronization mechanisms for each notification. We also evaluate our implementation on three real-world benchmarks, a stencil computation, a tree computation, and a Colicky factorization implemented with tasks. Our scheme always performs better than traditional message passing and other existing RMA synchronization schemes, providing up to 50% speedup on small messages. Our analysis shows that Notified Access is a valuable primitive for any RMA system. Furthermore, we provide guidance for the design of low-level network interfaces to support Notified Access efficiently.
Original languageEnglish (US)
Title of host publication2015 IEEE International Parallel and Distributed Processing Symposium
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages871-881
Number of pages11
ISBN (Print)9781479986491
DOIs
StatePublished - May 2015
Externally publishedYes

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