  The paper highlights that the cooperation of the components of the computing
systems receives even more focus in the coming age of exascale computing. It
discovers that inherent performance limitations exist and identifies the major
critical contributions of the performance on many-many processor systems. The
extended and reinterpreted simple Amdahl model describes the behavior of the
existing supercomputers surprisingly well, and explains some mystical
happenings around high-performance computing. It is pointed out that using the
present technology and paradigm only marginal development of performance is
possible, and that the major obstacle towards higher performance applications
is the 70-years old computing paradigm itself. A way to step forward is also
suggested
