A performance model for fine-grain accesses in UPC
IPDPS'06 Proceedings of the 20th international conference on Parallel and distributed processing
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Abstract: UPC, or Unified Parallel C, is a parallel extension of ANSI C. UPC is developed around the distributed shared-memory programming model with constructs that can allow programmers to exploit memory locality, by placing data close to the threads that manipulate them in order to minimize remote accesses. Under the UPC memory sharing model, each thread owns a private memory and has a logical association (affininty) with a partition of the shared memory. This paper discusses an early release of UPC_Bench, a benchmark designed to reveal UPC compilers performance weaknesses to uncover opportunities for compiler optimizations. The experimental results from UPC_Bench over the Compaq AlphaServer SC will show that UPC_Bench is capable of discovering such compiler performance problems. Further, it will show that if such performance pitfalls are avoided through compiler optimizations, distributed shared memory programming paradigms can result in high-performance, while the ease of programming is enjoyed.