NDLI: Architecture-aware optimization targeting multithreaded stream computing

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Architecture-aware optimization targeting multithreaded stream computing

Content Provider	ACM Digital Library
Author	Do, Synho Pien, Homer Jang, Byunghyun Kaeli, David
Abstract	Optimizing program execution targeted for Graphics Processing Units (GPUs) can be very challenging. Our ability to efficiently map serial code to a GPU or stream processing platform is a time consuming task and is greatly hampered by a lack of detail about the underlying hardware. Programmers are left to attempt trial and error to produce optimized codes. Recent publication of the underlying instruction set architecture (ISA) of the AMD/ATI GPU has allowed researchers to begin to propose aggressive optimizations. In this work, we present an optimization methodology that utilizes this information to accelerate programs on AMD/ATI GPUs. We start by defining optimization spaces that guide our work. We begin with disassembled machine code and collect program statistics provided by the AMD Graphics Shader Analyzer (GSA) profiling toolset. We explore optimizations targeting three different computing resources: 1) ALUs, 2) fetch bandwidth, and 3) thread usage, and present optimization techniques that consider how to better utilize each resource. We demonstrate the effectiveness of our proposed optimization approach on an AMD Radeon HD3870 GPU using the Brook+ stream programming language. We describe our optimizations using two commonly-used GPGPU applications that present very different program characteristics and optimization spaces: matrix multiplication and back-projection for medical image reconstruction. Our results show that optimized code can improve performance by 1.45x--6.7x as compared to unoptimized code run on the same GPU platform. The speedup obtained with our optimized implementations are 882x (matrix multiply) and 19x (back-projection) faster as compared with serial implementations run on an Intel 2.66 GHz Core 2 Duo with a 2 GB main memory.
Starting Page	62
Ending Page	70
Page Count	9
File Format	PDF
ISBN	9781605585178
DOI	10.1145/1513895.1513903
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2009-03-08
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Brook+ Optimization Gpgpu
Content Type	Text
Resource Type	Article

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