Amhdal's and Sun-Ni's Laws

»Sun-Ni Law

Sun-Ni's Law (or Sun and Ni's Law, also known as memory-bounded speedup), is a memory-bounded speedup model which states that as computing power increases the corresponding increase in problem size is constrained by the system’s memory capacity.

In general, as a system grows in computational power, the problems run on the system increase in size.

Analogous to

• Amdahl's law, which assumes that the problem size remains constant as system sizes grow, and
• Gustafson's law, which proposes that the problem size should scale but be bound by a fixed amount of time.

Sun-Ni's Law states the problem size should scale but be bound by the memory capacity of the system.

Sometimes, (especially for FPGA Scientific Acceleration, ) memory bandwidth may be more important than memory capacity.