May 2022
Intermediate to advanced
580 pages
18h 32m
English
book
Programming Massively Parallel Processors, 4th Edition
by Wen-mei W. Hwu, David B. Kirk, Izzat El Hajj
Content preview from Programming Massively Parallel Processors, 4th Edition
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Chapter 17
Iterative magnetic resonance imaging reconstruction
Abstract
In this chapter we present the key steps for parallelizing and optimizing a loop-intensive application, iterative reconstruction of magnetic resonance imaging images, from its sequential form. We start with the appropriate organization of parallelization: the scatter approach versus the gather approach. We show that transforming from a scatter approach to a gather approach is key to avoiding atomic operations, which can significantly reduce the performance of parallel execution. We discuss the practical techniques, that is, loop fission and loop interchange, that are needed to enable the gather approach to parallelization. We further present the application of optimization ...
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