Thesis Defense: Automatic Application-Specific Optimizations under FPGA Memory Abstractions

Speaker: PhD Candidate Hsin-Jung Yang , CSG - CSAIL - MIT

Date: Wednesday, April 12, 2017

Time: 3:00 PM to 5:00 PM Note: all times are in the Eastern Time Zone

Public: Yes

Location: 32-D463 (Star)

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Host: Professor Srini Devadas and Professor Joel Emer, CSG - CSAIL - MIT

Contact: Sally O. Lee, 3-6837, sally@csail.mit.edu

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Reminders to: seminars@csail.mit.edu

Reminder Subject: TALK: Thesis Defense: Automatic Application-Specific Optimizations under FPGA Memory Abstractions

Abstract

FPGA-based accelerators have great potential to achieve better performance and energy-efficiency compared to general-purpose solutions because FPGAs permit the tailoring of hardware to a particular application. This hardware malleability extends to FPGA memory systems: unlike conventional processors, in which the memory system is fixed at design time, cache algorithms and network topologies of FPGA memory hierarchies may all be tuned to improve application performance. As FPGAs have grown in size and capacity, FPGA physical memories have become richer and more diverse in order to support the increased computational capacity of FPGA fabrics. Using these resources, and using them well, has become commensurately more difficult, especially in the context of legacy designs ported from smaller, simpler FPGA systems. This growing complexity necessitates resource-aware compilers that can make good use of memory resources by performing application-specific optimizations.

In this thesis, we leverage the freedom of abstraction to build program-optimized memory hierarchies on behalf of the user, making FPGA programming easier and more efficient. To enable better generation of these memory hierarchies, we first provide a set of easy-to-use memory abstractions and perform several optimization mechanisms under the abstractions to construct various memory building blocks with different performance and cost tradeoffs. Then, we introduce a program introspection mechanism to analyze the runtime memory access characteristics of a given application. Finally, we propose a memory compiler that automatically synthesizes customized memory hierarchies tailored for different FPGA applications and platforms, enabling user programs to take advantage of the expanded memory capabilities of modern FPGAs.

Thesis Supervisors: Professor Srini Devadas and Professor Joel Emer
Thesis Committee: Professor Daniel Sanchez

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Created by Sally O. Lee Email at Friday, April 07, 2017 at 2:02 PM.