Findings 5) and 6) -- Layered Software

5)One needs a layered (hierarchical) software model which supports an efficient use of multiple levels of abstraction in a single program.
- Higher levels of Programming model hide extraneous complexity
- highest layers are application dependent Problem Solving Environments and lower levels are machine dependent
- Lower levels can be accessed for additional performance
- e.g. HPF Extrinsics. Gcc ASM, MATLAB Fortran Routines, Native classes in Java
6)One needs a set of software tools which match the layered software (programming model)
- Debuggers, Performance and load balancing tools