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1) Use a language where you have very close control on what the processor does
in the end, => C or Fortran or Assembler
2) I don't understand what you mean by coding style?
3) concrete suggestion depend on
a) your algorithm (2D,3D,materials, excitation, output data, ABC)
b) your processor (clock, pipeline length, cache size, number of registers)
c) memory bandwith
d) parallelization (OpenMP, MPI, etc)
Some general advice
- Really understand the algorithm you use
- Measure speed/memory
- Concentrate on the innermost loops