HLAM/PetaSIM

• Development and formal specification of Hierarchical High Level Application Modeling Framework (HLAM). The HLAM will include mechanisms to allow users to provide: a) hierarchical description of applications, b) high level specification of a target machine, c) procedures to define how the hierarchical application description is mapped to the machine model and d) cost model to be used in performance estimation.
• Development of a simulation framework (PetaSIM) that is able to generate performance predictions for application emulators using information provided by the high level application modeling framework. PetaSIM will include support for the generation and use of aggregates as building blocks for specifying modules.

Options:

• Development of runtime/compile time techniques that support semi-automatic generation of HLAM/PetaSIM aggregates and modules.
• PetaSIM support for additional collective data movement primitives, which will increase the range of multi-phase loosely synchronous problems handled. This corresponds to optimized support of the advanced MPI calls, such as ones for collective communication.
• Development of optimized parallel implementation of PetaSIM. We will focus our efforts on paralleling the data parallel portions of PetaSIM but will tackle the event driven portions of the simulation as necessary. The computational demands associated with PetaSIM will vary with the structure of a problem's HLAM hierarchical graph. In an adaptive problem, the structure of the hierarchical graph will change as the program progresses. We consequently anticipate that an efficient PetaSIM implementation will require the use of adaptive load balancing methods.