Hybrid coherence for scalable multicore architectures

This work describes a cache architecture and memory model for 1000+ core microprocessors. Our approach exploits workload characteristics and programming model assumptions to build a hybrid memory model that incorporates features from both software-managed coherence schemes and hardware cache coherence. The goal is to achieve the scalability found in compute accelerators, which support relaxed ordering of memory operations and programmer-managed coherence, while providing a programming interface that is akin to the strongly ordered cache coherent memory models found in general-purpose multicore processors today. The research presented in this dissertation supports the following thesis: To be scalable and programmable, future multicore systems require a cached, single-address space memory hierarchy. A hybrid software/hardware approach to coherence management is required to support such a memory hierarchy in 1000+ core processors and is achievable only by leveraging the characteristics of target applications and system software. We motivate a hybrid memory model and present our approach to addressing the challenges facing such a model. We discuss and evaluate a scalable 1024-core architecture, workloads that we see as targets for such an architecture, a memory model that relies on software management of coherence, and scalable hardware coherence schemes. Using these components, we develop the software and hardware support for a hybrid memory model. We demonstrate that our techniques can be used to reduce hardware design complexity, to increase software scalability, or to combine the two.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Electrical & Computer Engr

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2011

Author dc:creator

• Kelm, John H.

Contributors dc:contributor

• Lumetta, Steven S.
• Frank, Matthew I.
• Chen, Deming
• Patel, Sanjay J.

• Accelerator architecture
• hybrid architectures
• memory model
• cache coherence

Statement dc:rights

• Copyright 2010 John H. Kelm

Language dc:language

en

Handle dc:identifier

http://hdl.handle.net/2142/18272

OAI record oai:identifier

https://www.ideals.illinois.edu/oai-pmh?verb=GetRecord&metadataPrefix=etdms&identifier=oai%3Awww.ideals.illinois.edu%3A2142%2F18272