A methodology for high-level synthesis of communication on multicomputers

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Abstract
Freeing the user from the tedious task of generating explicit communication is one of the primary goals of numerous research projects on compilers for distributed memory machines. In the process of synthesis of communication, the effective use of collective communication routines offers a considerable scope for improving the program performance. This paper presents a methodology for determining the collective communication primitives that should be used for implementing the data movement at various points in the program. We introduce the notion of certain synchronous properties between array references in statements inside loops, and present tests to determine the presence of these properties. These tests enable the compiler to analyze quite precisely the communication requirements of those statements, and implement communication using appropriate primitives. These results not only lay down a framework for synthesis of communication on multicomputers, they also form the basis of our implementation of a system that statically estimates the communication costs of programs on multicomputers.

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