XTUNE: Autotuning for Exascale

XTUNE is developing the first unified autotuning framework that seamlessly integrates programmer-directed and compiler-directed autotuning. The aim is to enable  a programmer and the compiler system to work collaboratively to tune a code, unlike previous systems that place the entire tuning burden on either programmer or compiler. The proposed system will dramatically improve generality and usability of autotuning technology through an integrated, composable collection of tools, including an autotuning compiler framework, language extensions, a code transformation framework, compiler decision algorithms and performance models. To maximize productivity impact of autotuning and make it approachable by many users, it should be encapsulated in domain-specific tools developed by expert users and made available to others. To this end, we will demonstrate autotuning on computations from AMR MG, Combustion Co-Design Center, TCE, and Nek5000 and will work with DOE to define a small number of other mini-app demonstrations.