Caching Puts and Gets in a PGAS Language Runtime

We investigated a software cache for PGAS PUT and GET operations. The cache is implemented as a software write-back cache with dirty bits, local memory consistency operations, and programmer-guided prefetch. This cache supports programmer productivity while enabling communication aggregation and overlap. We evaluated an implementation of this cache for remote data within the Chapel programming language. The cache provides a 2x speedup for several distributed memory application benchmarks written in Chapel across a variety of network configurations. In addition, we observed that improvements to compiler optimization did not remove the benefit of the cache.