Slide 91
Slide 91 text
Summary
Summary
USL is 2-parameter scalability model C(N, α, β)
Requires α, β > 0 for C(N) to be concave function
Superlinear measurements C(N)/N > 1 do exist
Extra fitting parameter C(N, α, β, γ) ⇒ JvN elephants
Discovered superlinear USL with α < 0
Super-efficiencies are not free
Like perpetual motion:
no free lunch
pay the piper eventually
debugging it is the hard part
Thm: Superlinearity always followed by capacity degradation
More (Oracle ???) superlinear measurements would be good
c 2014 Performance Dynamics Superlinear Speedup October 15, 2014 63 / 64