sponsored byIEEEACMThe International Conference for High Performance 
Computing, Networking, Storage and Analysis
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SCHEDULE: NOV 16-21, 2014

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Orthogonal Scheduling of Stencil Computations with Chapel Iterators

SESSION: ACM Student Research Competition Poster Reception

EVENT TYPE: ACM Student Research Competition

TIME: 5:15PM - 7:00PM

AUTHOR(S):Ian Bertolacci

ROOM:New Orleans Theater Lobby

ABSTRACT:

Stencil computations are an important element of scientific computing that can suffer from performance caps due to poor iteration scheduling. Implementing stencil computations is already a difficult task, and the addition of specifying schedules with both good parallelism and high data locality introduces a new dimension of difficulty and code complexity. While compilers already exist to automate the task of optimization, they may lack the information required to recognize when code could be transformed to take advantage of a particular scheduling.

Using the Chapel language, we implemented tiling schedules decoupled from the implementation of the stencil computation. We observed performance gains equivalent to highly coupled code, without introducing the complexity. We will discuss the advantages of using iterators as a scheduling mechanism, as well as the possibility of creating a Chapel module of iterators that would provide developers with a simple method to include better optimized scheduling into their code.

Chair/Author Details:

Ian Bertolacci - Colorado State University

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