Interprocedural Distribution Assignment Placement: More Than Just Enhancing Intraprocedural Placing Techniques
Proceedings 1997 International Conference on Parallel Architectures and Compilation Techniques (1997)
San Francisco, CA
Nov. 11, 1997 to Nov. 15, 1997
J. Knoop , Fakultat fur Math. und Inf., Passau Univ., Germany
E. Mehofer , Fakultat fur Math. und Inf., Passau Univ., Germany
Avoiding unnecessary remappings at run-time by means of a strategic distribution assignment placement (DAP) is a major means for improving the run-time efficiency of data-parallel programs on distributed-memory architectures. In Proc. Euro-Par '97, pp. 364-73 (1997), we presented a novel and aggressive intraprocedural algorithm achieving this by eliminating partially redundant and partially dead distribution assignments. In this paper, we show how to enhance this approach interprocedurally. Surprisingly at first sight, it turns out that a straightforward adaption of the intraprocedural approach fails because central properties being valid for the intraprocedural case do not carry over to the interprocedural one, revealing severe anomalies. After discussing the essential differences and analogies of DAP in the interprocedural and interprocedural cases, we show how to overcome these anomalies in order to arrive at a powerful and flexible approach for interprocedural DAP (IDAP). As in the interprocedural case, we get a hierarchy of IDAP algorithms of varying power and efficiency supporting user-customized solutions. First practical experiences underline its importance and effectivity.
parallel programming; interprocedural distribution assignment placement; intraprocedural placing techniques; unnecessary run-time remappings; run-time efficiency; data-parallel programs; distributed-memory architectures; partially redundant distribution assignment elimination; partially dead distribution assignment elimination; anomalies; algorithm hierarchy; user-customized solutions; High Performance Fortran; dynamic data redistribution; interprocedural data-flow analysis; optimization
E. Mehofer and J. Knoop, "Interprocedural Distribution Assignment Placement: More Than Just Enhancing Intraprocedural Placing Techniques," Proceedings 1997 International Conference on Parallel Architectures and Compilation Techniques(PACT), San Francisco, CA, 1997, pp. 26.